Newly rebuilt Transmission hard

Newly rebuilt Transmission hard

Postby AstroVanDan [OP] » September 16th 2016, 9:45pm

I just picked up my van from the transmission shop today . They told me that it shift hard and that it will wear in after 500 miles. I drove it home and between first and second it shift real hard. Will it wear in ? Its shifting way to hard now… Help… :confused:
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Re: Newly rebuilt Transmission hard

Postby 95AstroLT » September 16th 2016, 10:25pm

Did the previous transmission shift hard?

Seen multiple comments on this site about these vans shifting hard. Our 95 does - shifted hard with the old transmission and when it was replaced still shifted hard with a totally different transmission.

Two transmission shops say all is in order on the computer control for the trans. I had the idea maybe the throttle position sensor was off (even though its readings seemed fine) and replaced it with one from the junkyard - no difference.

Only time it shifts semi-smoothly is if I really wind it out - like floor it all through first and into second - then it's more civilized for a couple days or so. Still firm, but not bang shifting. But eventually it comes back.

Oh well, less wear on the clutch abrasive material. Plus it feels like a hot rod. :lol:

If anyone has solved this, I wouldn't mind learning the cause.
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Re: Newly rebuilt Transmission hard

Postby Leeann_93 » September 16th 2016, 10:54pm

Did they put a shift kit in when they rebuilt it?

None of my Astro/Safaris shift hard. Not one of the 5...

However, if they put in a shift kit, it does firm up the shifts. If they put in the Corvette servo, it firms up the shifts. If they replaced one of the springs, that firms up the shifts....
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Re: Newly rebuilt Transmission hard

Postby plymouthcranbrook » September 17th 2016, 12:00am

I had my 2001 AWD redone in January and the shifts are smooth and not the least bit jerky. The only difference is that the shift points seem higher than before.
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Re: Newly rebuilt Transmission hard

Postby AstroVanDan [OP] » September 17th 2016, 7:06pm

Thanks for the replays, The Van shifted smooth before . I had a line go bad and it ran low on fluid and burnned up the gears. I am not sure what they replaced or did not replace , I will be asking on monday. After I dorve to a gig at the House of Blues last night in Orlando it feel like someone is hitting from behind everytime it shifts from first to second and in passing gear it a hard shiftn as well. I feels like wiplash when it jecks into gear… We will see...
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Re: Newly rebuilt Transmission hard

Postby paulo57509 » September 17th 2016, 7:21pm

The 4L60E's have some kind of line pressure/shift adaptive learning function that's tied to the power train control module (PCM).

I recall reading someplace that typically after a rebuild, you should connect a scan tool and reset this function. I also read someplace else that this is not necessary and the PCM will re-learn on it's own.

After I completed my rebuild I didn't bother with clearing this function; moot point because I have no way of doing this because my scan tools don't have proprietary function access.

I didn't notice any weird or hard shifting behavior immediately after the rebuild or now.
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Re: Newly rebuilt Transmission hard

Postby Mmusicman » September 18th 2016, 4:07am

When the transmission was BRAND NEW... I'm sure it didn't shift hard. Unless they modified something intentionally... sorry to say, my guess something isn't right.

Now I like "firm" shifts (I have a shift kit)... but "hard" shifts can be damaging. I hope they have a warranty.

Good luck.
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Re: Newly rebuilt Transmission hard

Postby Zebediah III » September 18th 2016, 4:14am

A quick, firm positive shift is OK, if that's what you told them you wanted.
A transmission that bangs, slams into the next gear, clanks, etc. or otherwise
scares you and makes you wonder how long before something will break is NOT
OK. Your wisdom teeth should not come loose every time you drive up to the
store.
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Re: Newly rebuilt Transmission hard

Postby Astro Pop » September 18th 2016, 6:38am

Any shop that says "it needs to break-in" is an idiot. If a new car had all the "break-in" times all these rebuilders say, that new car would barely get off the lot. No there is a problem that needs to be addressed. There is a transmission fuse pull it check it and then reinstall it. That solved a hard shift for me. Secondarily pull a battery terminal to reset the main ECM to begin a possible relearn. Failing any change there go back to the shop and insist on it being repaired.
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Re: Newly rebuilt Transmission hard

Postby AstroVanDan [OP] » September 21st 2016, 12:04pm

Heres the update . Took my van back to the shop. It seam that the computer had to be reset . When the line broke the computer ajusted itself for the gears slipping. They said it would ajust it self after 500 miles , I was at about 250 and I could take any more so I paid $150 to have the computer reset. He said I was 3 trips from it resetting its self. It shiffing great now. So all in I got the transmittion rebuilt and a new line for $1425.00.. 300,000 miles here I come..
Last edited by AstroVanDan on September 21st 2016, 2:15pm, edited 1 time in total.
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Re: Newly rebuilt Transmission hard

Postby AstroWill » September 21st 2016, 12:22pm

Glad to hear you got it all straightened out!

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Re: Newly rebuilt Transmission hard

Postby 95AstroLT » September 21st 2016, 5:49pm

Mine must have something different causing the hard shift or a trans shop would have caught it. And it's gone WAAAYYY more than 500 miles - problem showed up about 5 years ago, and has continued 2 more years with the replacement transmission. On the bright side, there can't be any clutch slippage so they should outlast the rest of the van!
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Re: Newly rebuilt Transmission hard

Postby Leeann_93 » September 21st 2016, 9:40pm

^ yours is a check valve/valve body issue - you need to replace the valve body.
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Re: Newly rebuilt Transmission hard

Postby Mmusicman » September 22nd 2016, 12:27am

It's ironic with the computer being such a vital part of the transmission... that they would let it go out the door like that... and then later charge you to "reset" it to work properly. I have issues with this.

Glad you got it resolved!
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Re: Newly rebuilt Transmission hard

Postby Zebediah III » September 22nd 2016, 12:33am

Yeah I know!
It only takes a minute and it's really part of the $1500 repair the guy paid for.
Just too lazy to get the scan-tool or laptop out. Too lazy to burnish the band or
double check snaprings too?

Any wonder people love transmission shops so much?
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