Chevy Astro and GMC Safari Forum banner
1 - 2 of 2 Posts

· Banned
Joined
·
2,502 Posts
Discussion Starter · #1 ·
Gear Vendors is a company that builds over drive and under drives for alot of applications.For Astro 4x4's the important part is you can put a really deep rearend gear for off road and use the over drive for street use.For RWD's the neat part is the spit gearing and a better ablility for towing.In both cases it lowers trans temp by 100 degrees because the Gear vendor unit takes on 1/2 of the load and uses it's own tranny fluid.Bottom line is the Gear vendor unit keeps the engine in it's torque band saving gas.

www.gearvendors.com

RACING AND TOWING PERFORMANCE
OVERDRIVE ECONOMY
The Absolute Highest Horsepower Handling Overdrive you can buy!

Gear-Splitting Performance and Overdrive Economy.
For RV's, Trucks, Muscle Cars, Hot Rods, and Racing.
The Finest Quality Auxiliary Transmissions.
The Ultimate in Horsepower Handling and Performance.

GEAR VENDORS provides overdrive product to racing cars and trucks up to 2000hp and trucks towing heavy RV's up to 25,000lbs gcvw. Whether you are trying to move a couple tons up a steep incline or moving just a couple thousand down the track - the fastest way is with the right gearing. Add the benefits of a final overdrive ratio to reduce engine rpm and increase fuel mileage by typically 20-28% and you have a product that is the single biggest innovation you can bolt to your car or truck. With fuel costs high the overdrive can pay for itself in mileage and engine wear reductions. That makes the driving pleasure of overdrive, and performance improvements free - and then the vehicle is also worth more when/if you ever sell it with the GEAR VENDORS. In the long run it just doesn't cost you anything to own a GEAR VENDORS UNDER/OVERDRIVE™. For an in-depth discussion on which vehicles can expect these mileage gains see our "common questions" section on the web site.

Torque (times) RPM (divided by 5252) = Horsepower (this can be expressed) Tq X RPM / 5252 = HP. GEAR VENDORS is one of few products that can work both sides of this equation for real performance gains as well as consistent fuel consumption reductions. Gears are multipliers of torque and our Ratio Splitting capability allows you to shift to a gear with more mechanical advantage than the next stock gear in automatic transmissions and wide ratio manuals. This also means engine rpm drops about half what it did without the GEAR VENDORS and so rpm is sustained - higher torque and rpm on shift = more HP. And then shift to an overdrive final and reduce both rpm and torque to reduce the manufacture of HP when steady cruising to improve fuel mileage and decrease wear on the engine and engine driven accessories.

2 world records in Drag Racing, 4 Off Road Racing Titles, and several Land Speed records all benefit from GEAR VENDORS ratio splitting performance. At the same time this ratio splitting makes less work for the main transmission in the vehicle to then advance to the next gear (less ratio change) and thus the main transmission itself becomes more reliable. This is a great benefit at the track or on the highway. Whether your interest is motorsport or recreation - you cannot buy a more proven product.

True OEM Quality
OEM means that new vehicles have come factory equipped with GEAR VENDORS as original equipment. When GEAR VENDORS first started producing the DeNormanville planetary overdrive in 1979 there were no American vehicles with overdrive. Only the import cars with manual transmissions had an overdrive gear. Through the years we have worked with Ford, GM, and Chrysler and our products have come factory on everything from one of Americas fastest production cars (GM's TwinTurbo Callaway Corvette) to Americas largest RV manufacturer (Fleetwood Motorhomes). In 1981 we won our first Best Engineered award from SEMA (the largest automotive aftermarket organization). GEAR VENDORS is without question the most awarded and recognized aftermarket transmission product.

Driving Green for the Earth
GEAR VENDORS has been manufacturing overdrives for 27 years. We have been reducing fuel emissions on the most powerful and fuel consuming gas and diesel vehicles for nearly 3 decades before Green House gas emissions became the buzzword they are today. GEAR VENDORS equipped vehicles are responsible for reducing emissions nearly 25% in the average application compared to the non-equipped stock counterpart. With nearly 75,000 units in service we are reducing tons of emissions per day. Whether your purchase of our product is for a brand new diesel truck or a 1960's muscle car it is nice to know this performance product can substantially benefit the planet and our countries oil dependency.

Performance Electronics
Related to fuel economy, performance, and emissions - GEAR VENDORS overdrive kits include electronics that keep the vehicle in the optimum performing gear. Whether you are driving a older non-computer controlled vehicle or a late model with all the latest emissions computers our electronics provide the interface to ensure maximum performance and correct rpm without lugging or overreving in the wrong gear. The OE factory programming remains intact and our processor just makes it aware of the actual ratio 1,000 of times per second. In older vacuum or throttle linkage transmissions the stock governor on the output shaft instantly slows down the moment the overdrive shifts and so automatically moves the shift point in any overdrive gear up by the correct 28.6%. So both electronic and non-electronic automatic transmissions gain a group of features including a passing gear or climbing gear that is automatically available without driver intervention and is at the split between 2nd and 3rd where you really want it. Electronic options also exist for racing and performance use such a paddle-shifters with our programming already installed by companies like MasterShift, and our AutoShift Sequencer that can work with stock and aftermarket shifters just like many of the race teams use. Our standard AutoDrive electronic however do include several great features for a combination of street/strip use including AutoLaunch for both manuals and automatics.

Customer Service Guarantee
GEAR VENDORS makes the highest quality, most expensive overdrive you can buy. We back that with customer service and warranties you do not commonly find in business today. Call us at the factory and you will talk to real enthusiasts that know drivetrains. Our factory people will ask you the details of your vehicle and its use and then recommend our product only if it is going to be exactly what you expected and give you great benefits in your application (which is exactly why we can give a money back guarantee). These factory reps can give you the details of installation and use and send you photos, diagrams, and brochures for free. If you are installing yourself we will ship product direct to you with full factory support. If you would like to have one of GEAR VENDORS 500 nationwide dealers install the product - we will make sure to communicate with the local dealer and get your exact product in his hands for the install day. All or products come with a money back guarantee and a 2 year unlimited mileage warranty (except diesel manual truck and commercial applications see warranty for details). Last but not least - we do not show pictures of racing and then deny your warranty if you race (hard to believe so many companies do just that). All GEAR VENDORS warranties cover you on the street and at the track (though we do require a contingency decal for pro users). Call us at 800-999-9555 and ask for "new product customer service" - get the kind of service you thought was left back in the 60's.

[email protected]

GEAR VENDORS, INC. 1717 North Magnolia Avenue, El Cajon, CA 92020
Toll Free 800-999-9555 • Telephone (619) 562-0060 • Fax (619) 562-1186

It's pricely-but will save ya a bundle at the gas pump.
 

· Banned
Joined
·
2,502 Posts
Discussion Starter · #2 ·
Here you will see how it applies to rear wheel drives with 700R4's.Look at the gear chart-kind of interesting.

GM 4-Speed Auto
GM Truck / Car / Van / Motorhome
2 Wheel Drive 4-Speed Automatics
There are two basic GM 4-Speed automatics: The light duty 700R4/4L60E found mainly in half ton and car applications, and the heavy duty 4L80E in the heavier applications.

700R4/4L60E's have a low 3.06 first gear which is good for initial take off but this makes the transmission have the widest ratio changes of all popular makes and is the route of all the 4L60's reliability and performance issues. The intention of the designers (a low starting gear and tall overdrive) was the best possible EPA ratings, which the trans does well but these wide ratios are a big compromise to performance and durability.

Even if you use forced induction (supercharging) on a 4L60 trans equipped vehicle it is hard to overcome the wide ratios. The vehicle cannot simply increase its vehicle speed 47% (the ratio split of the 1-2 shift) without pulling the motor rpm down a huge amount. Thus the more power you feed the 4L60 the more it converts to heat in its clutches and torque convertor. If you try to lock down the clutches without computerized torque management you break the transmission - there is just no way to work well with stock ratios that are equivalent to skipping a gear (going from 1st to 3rd - skipping 2nd in an M21 manual is only 41%).

The GEAR VENDORS will give you Gear-Splitting to fix those wide ratios with a gear between each of them for tremendous gains in performance. Because of these wide factory ratios there is no better example of the difference that can be made with adding a Gear Vendors. See Final Drive Ratios. Gains of over 50 horsepower and 70lb ft. of torque are easily achieved just by having the close ratios when you need them.

The GEAR VENDORS also gives you an important towing or performance overdrive gear that is between the tall factory overdrive ratio (4th) and Drive (3rd). This gear will give you 11% more torque multiplication and the right rpm when you want instead of the torque converter locking and unlocking repeatedly or lugging the engine. When towing, this gear will lower transmission temperatures by as much as 100 degrees when compared to factory overdrive. Cars and Trucks with 3.73 rear gears and higher (numerically) can also make use of double overdrive when not towing for 10-15% gains in MPG.

4L80E's used in motorhomes and trucks have a .75 overdrive ratio very similar to GEAR VENDORS .78 but the factory unit tends to unlock and lock (hunt). The GEAR VENDORS will not hunt and will also reduce temperatures in the main transmission by as much as 100 degrees on warm days when towing. Consequently all our customers tow in the GV ratio and greatly extend the life of the trans.

Trucks running empty can make use of double overdrive for great economy and extended engine life. Motorhomes present too large a frontal area to the oncoming wind to make double overdrive practical but because they are always loaded they greatly need the GearSplitting and alternative Overdrive features of the GEAR VENDORS.

GearSplitting is the feature that allows the UNDER/OVERDRIVE to shift between the gears. You will now have approximately ½ the drop of engine rpm from one gear to the next when you want power. This is why a GEAR VENDORS will give you more power than any underdrive or overdrive on the market (see Common Questions). By keeping torque multiplication higher and engine rpm narrower you increase engine performance by typically more than 40hp and 60lb ft. of torque without any modification to the engine (see Final Drive Ratio charts and Horsepower and Torque curves), (see also Common Questions on performance modifications).

This is why big trucks (Kenworths etc.) use gears (most 18 wheelers have 15 to 21 gears) instead of engine modifications. Because gearing gives them performance which actually improves the reliability of the engine. The heavier you are loaded the more you need a GEAR VENDORS.

If you already have engine modifications (chips, exhaust, fuel increases, etc.) the GEAR VENDORS will let you get the most from them through working in narrower rpm ranges when loaded and also by adding torque multiplication to make it easier on the engine and transmission so as not to damage them with your improvements.

The GEAR VENDORS comes with a 2-year unlimited mileage warranty (1 year on commercial applications) and a 30 day money back guarantee that you will love the performance (see Warranty for details). The GEAR VENDORS is the only aftermarket performance device or auxiliary transmission to come as original factory equipment on new cars, trucks, vans or motorhomes. Over 1 million in the 80's and 90's were installed by manufacturers on vehicles; ie: Ford Diesel Transit Vans (european market), Volvo gas and diesel, Fleetwood, Allegro, Rexhall, Monaco and other motorhomes and GM's Twin Turbo Callaway Corvette.

Be sure to study the final drive ratio charts. These show you exactly what you are getting in a Gear Vendors - gears. Notice how when you want a gear lower than 3rd but taller than 2nd for climbing grades that a Gear Vendors is just that. If you are going to keep the vehicle for any reasonable length of time, it just doesn't cost you anything for this performance. This is because of the great benefit to fuel economy when you run with both the factory overdrive and the Gear Vendors on (double over). Also, all the time you are enjoying better performance when climbing grades and towing you are taking much better care of your transmission and engine when Gear Vendors equipped.

If your vehicle is heavily loaded or you just love performance the GEAR VENDORS is the ultimate option.

GM/CHEVROLET FINAL DRIVE RATIOS
It is the gear under your seat that counts. Gearing is what you are buying when you purchase a Gear Vendors Under/Overdrive. If you take a few moments to study the gear chart for your transmission and rear end ratio combination you will see why this product is so popular. The Final Drive Ratio shows you how many times the engine turns for one complete turn of the tires. Gears are multiplier of torque. The mathematical equation for Horsepower is; Torque X RPM/5252 = HP. Close ratio gearing lets us work both the torque and rpm side of this equation for big gains in HP and performance. Notice for instance that 1st-over has a lot more torque multiplication than 2nd - now look how low you would have to go in rear end ratio to make your second gear have as much torque as 1st-over. Same with 2nd-over compared to 3rd.

Whatever your 2nd-over final drive number is - that is equivalent to having that ratio for a rear end torque multiplier. Of course, with gear-splitting we are keeping the engine rpm up from one shift to the next and further exploiting the ratio benefit.

There is not room here to cover all the details (like the benefit to passing gear and such) so call us at the factory to discuss your exact application - we have customer service guys on hand for you to ask these types of questions.

700R4/4L60E 4-SPEED AUTOMATIC OVERDRIVE
Axle Ratio 4.88 4.56 4.10 3.73 3.42 3.23
Trans Ratio Final Drive Ratio
1st 3.06 14.93 13.95 12.55 11.41 10.47 9.88
Over 2.39 11.64 10.88 9.79 8.90 8.17 7.71
2nd 1.63 7.95 7.43 6.68 6.08 5.57 5.26
Over 1.27 6.20 5.80 5.21 4.74 4.34 4.10
3rd 1.00 4.88 4.56 4.10 3.73 3.42 3.23
Over 0.78 3.81 3.56 3.20 2.91 2.67 2.52
4th GM O/D 0.70 3.42 3.19 2.87 2.61 2.39 2.26
Double OD 0.55 2.67 2.49 2.24 2.04 1.86 1.76

4L80E 4-SPEED AUTOMATIC OVERDRIVE
Axle Ratio 5.13 4.88 4.63 4.56 4.10 3.73 3.42
Trans Ratio Final Drive Ratio
1st 2.48 12.72 12.10 11.48 11.31 10.17 9.25 8.48
Over 1.93 9.92 9.44 8.95 8.82 7.93 7.22 6.60
2nd 1.48 7.59 7.22 6.85 6.75 6.07 5.52 5.06
Over 1.15 5.92 5.63 5.34 5.27 4.73 4.31 3.95
3rd 1.00 5.13 4.88 4.63 4.56 4.10 3.73 3.42
Over 0.78 4.00 3.81 3.61 3.56 3.20 2.91 2.67
4th GM O/D 0.75 3.85 3.66 3.47 3.42 3.08 2.80 2.57
Double OD 0.59 3.00 2.85 2.71 2.67 2.40 2.18 2.00

CHEVROLET/GMC Truck-Car-Van 2-Wheel Drive 4-Speed Automatics
Application Price Code

View Larger Image Part #3D0700A

Automatic 4-Speed 700R4 Mech Speedo $2895.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D0701A

Automatic 4-Speed 700R4 Elec Speedo $2895.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4L60A

Automatic 4-Speed 4L60E 93 and Newer $2895.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4L60E

Automatic 4-Speed 4L60E M30 4 Bolt Housing $2895.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4L60G

Automatic 4-Speed 4L60E - 4 Bolt Housing $2895.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4L61A

Automatic 4-Speed 4L60E M30 6 Bolt Housing $3095.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4L61E

Automatic 4-Speed 4L60E - 6 Bolt Housing $3095.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4L80A

Automatic 4-Speed 4L80E $3095.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4L80E

Automatic 4-Speed 4L80E $3095.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4L80G

Automatic 4-Speed 4L80E MT1 $3095.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4L80I

Automatic 4-Speed 4L80E $3095.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4L80K

Automatic 4-Speed 4L80E $3095.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4L80M

Automatic 4-Speed 4L80E $3095.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

View Larger Image Part #3D4l80I

Automatic 4-Speed 4L80E $3095.00

Qty:

Axle Ratio: 2.73 2.90 3.08 3.21 3.31 3.42 3.54 3.55 3.73 3.90 3.91 4.10 4.11 4.56 4.63 4.88 5.13 don't know

Tire Size:
(Aspect ratios or inches)

[email protected]

GEAR VENDORS, INC. 1717 North Magnolia Avenue, El Cajon, CA 92020
Toll Free 800-999-9555 • Telephone (619) 562-0060 • Fax (619) 562-1186
 
1 - 2 of 2 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top