NP236 what to do before install

NP236 what to do before install

Postby SoccerMom4x4 [OP] » April 10th 2018, 5:40am

Hey all, I just picked up an NP236 TC, just from an exterior viewpoint everything looks to be in good shape, no oil leakage or cracks. Anyways before I slap this in the van is there anything I should do while its on the bench? Anything to look for or check? I'm not looking to do a complete rebuild if I don't have to. Thanks for any info
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Re: NP236 what to do before install

Postby albrow100 » April 10th 2018, 6:18am

I'd like to split the case and reseal all the inputs and output shafts while its easy
if its full of metal it will be time to find a new one
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Re: NP236 what to do before install

Postby WinnieVan » April 11th 2018, 1:07am

do you know it worked before you bought it?

If not -- I'd crack it open and make sure you aren't going to regret installing it and having to buy another one!

That being said -- once you install it once... a swap job is pretty easy.
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Re: NP236 what to do before install

Postby SoccerMom4x4 [OP] » April 11th 2018, 1:37am

No idea if it was a runner or not, looks like for some piece of mind I'll split the cases and seal the shafts. Thanks for the advice, I would definitely rather find out its junk now before I install it! I'll keep this updated
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Re: NP236 what to do before install

Postby 1lowcab » April 11th 2018, 1:54am

If you are opening it up go ahead and replace the chain, especially since you don't know the history of it.

I would also pull the oil screen and the magnet and clean both of those out real good. And grab a pump rub protector plate, the np236 t-cases are prone to oil pump rub just like the np136 cases...the pump will rub a hole right through the case!
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Re: NP236 what to do before install

Postby Rinny » April 11th 2018, 2:57am

Have you already done all the wiring and did you get the TCCM that went with the 236?
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Re: NP236 what to do before install

Postby jmderyke » April 11th 2018, 4:49am

What to do before 236 install.
Step one disregard 236
Step two install 233c
Step three build manual linkage for cheap or buy it.
Step four have a beer, know you made a better decision, saved a lot of time and money with something that is far more reliable. Doesn't have electronics to break down will shift into 4x4 when needed.
The only thing to look out for is a heavily worn 233c
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Re: NP236 what to do before install

Postby Rinny » April 12th 2018, 12:05pm

The 236 is an awful lot of work to have the AWD option.
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Re: NP236 what to do before install

Postby SoccerMom4x4 [OP] » April 28th 2018, 6:39pm

I opened up the case last weekend and to my happy surprise the thing looks very clean, no shavings in the oil filter or magnet, the chain and gears look to be nearly perfect. Im going to install a pump rub protector plate and get a gasket and seal kit, what should I use to mate the cases back up? RTV? I like having AWD because in the PNW it rains and snows randomly so I don't mind the extra wiring to have that option. Plus I don't see any bad reviews on the NP236's in general so I figure once wired up it should operate like it should.
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Re: NP236 what to do before install

Postby akforceten » April 28th 2018, 7:09pm

by jmderykejmderyke is online! » April 10th 2018, 7:49pm

What to do before 236 install.
Step one disregard 236
Step two install 233c
Step three build manual linkage for cheap or buy it.
Step four have a beer, know you made a better decision, saved a lot of time and money with something that is far more reliable. Doesn't have electronics to break down will shift into 4x4 when needed.
The only thing to look out for is a heavily worn 233c


/\/\/\what he said /\ /\/\/\

I also live in the PNW and drive all over the mountains. I installed a 233c and can shift on the fly for any road conditions I encounter. keep it simple is my 2cents lol
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Re: NP236 what to do before install

Postby SoccerMom4x4 [OP] » April 28th 2018, 9:13pm

Hmmmmm I'll have to admit I'm a huge fan of keeping things simple. Now ya got me rethinking the 236 :confused: looks like I'll be doing some more research, thanks for your opinions
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Re: NP236 what to do before install

Postby akforceten » April 28th 2018, 9:34pm

it's super easy to do I found my floor shifter out of a 99 dodge 1500 made a bracket to fit the t-case and mounted the shifter where a manual shifter would be

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I also put in the s-10 differential and used the above item to be able to lock and unlock the front axle.
almost like an old-school 4x4.
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Re: NP236 what to do before install

Postby SoccerMom4x4 [OP] » April 29th 2018, 3:25am

Woah, not familiar with the 4x4 posi-lock what does it do? Is it like hub locks? I think Im sold on the 233 TC, easier and I like the idea of not relying on a little motor to shift my 4x4. I got a clean NP236 for sale in Portland!
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Re: NP236 what to do before install

Postby WinnieVan » April 29th 2018, 3:32am

6 months ago I would have bought your 236. But I’m all in for the 233 now. Manual shift for the win.


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Re: NP236 what to do before install

Postby 1lowcab » April 29th 2018, 3:55am

SoccerMom4x4 wrote:Woah, not familiar with the 4x4 posi-lock what does it do? Is it like hub locks? I think Im sold on the 233 TC, easier and I like the idea of not relying on a little motor to shift my 4x4. I got a clean NP236 for sale in Portland!



Heres a link to the posi lock
http://4x4posi-lok.com/app_chevy-s.html

Neat little set up really.
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Re: NP236 what to do before install

Postby jmderyke » April 29th 2018, 5:12am

Is it weird I'm getting joy from you guys taking the smarter decision and putting the 233c in?
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Re: NP236 what to do before install

Postby SoccerMom4x4 [OP] » April 29th 2018, 6:03am

No not at all!! Thats why I'm here, to build my van how I want but also smart and dependable!
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Re: NP236 what to do before install

Postby WinnieVan » April 29th 2018, 6:15am

jmderyke wrote:Is it weird I'm getting joy from you guys taking the smarter decision and putting the 233c in?


Time spend wiring the 236 is time spent not using my new 233 on the backroads of the Sierras!

Now I just need to get that new 233!
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Re: NP236 what to do before install

Postby Rinny » April 29th 2018, 2:34pm

The only real advantages o having a 236 that I can see is, (I am running one with a V8)
highway travel with snow or heavy rain, I find myself in that position quite often and it is very nice to have
washed out gravel roads, again I am in that position quite often, 4H will do the same but it is a quicker shift to AWD
short distances of deep mud, again 4H will do it to just a quicker shift to AWD (matter of seconds is all)
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Re: NP236 what to do before install

Postby akforceten » April 29th 2018, 7:51pm

by SoccerMom4x4

Woah, not familiar with the 4x4 posi-lock what does it do? Is it like hub locks?



with the 233c T-case in 2wd the Astros front differential will be free spinning the front driveline.
by swapping out the Astros front diff with and S-10 front diff of the same gear ratio as your van will not free spin the front driveline since the S-10 front diff locks with a vacuum actuator that's why I used the 4x4 posi lock system so I can control locking and unlocking the S-10 front diff
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