Tranny puked out fluid and caught fire!! - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 10-21-2002, 10:58 AM
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Tranny puked out fluid and caught fire!!

Hi guys!

Well, it looks like me ole T350 tranny is toast!
Yesterday we went out wheeling and for some reason it burnt the crap out of the fluid and sent a bunch of fluid out of the dipstick which in turn caught fire on the headers. She was slipping very badly by the time I got er home.

No fun!

Anyways, it's time to do a tranny swap.

So I have a few questions:
1) If I buy a T350 that was mated to a BB, what's involved in the swap? I think my bellhouseing and flywheel are still OK.

2) What's involved in a T400 swap?

3) Do I have to purchase a tranny out of a 4x4 or can I use my existing parts to make a tranny out of a 2wd work?

4) How can I identify if I have the t350 or t400 tranny in my truck? I've been told it's "probably the T350" but need to know for sure.
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post #2 of (permalink) Old 10-21-2002, 11:03 AM
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Re: Tranny puked out fluid and caught fire!!

Hmm, lost my sig.

Anyway, the truck is a 85 GMC 3/4T 4x4.
Powered by a 350 Small block. She came factory with a 14BSF rear, 10B front axle, 4:10's, tow package, and the big brake setup.

Thanks guys!
post #3 of (permalink) Old 10-21-2002, 12:58 PM
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Re: Tranny puked out fluid and caught fire!!

I swapped a th400 in place of my 700 and it was basically bolt up. The th350 is shorter so you may have to drill new crossmember bolts in teh frame but not sure of that.
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post #4 of (permalink) Old 10-21-2002, 01:42 PM
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Re: Tranny puked out fluid and caught fire!!

Crossmember modification wouldn't be a problem.
But that'll mean a new set of driveshafts correct?
post #5 of (permalink) Old 10-21-2002, 01:52 PM
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Re: Tranny puked out fluid and caught fire!!

also, the th350 modulator is on the back of the tranny and the th400 modulator is on teh pass side of the tranny if that helps
post #6 of (permalink) Old 10-21-2002, 01:55 PM
 
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Re: Tranny puked out fluid and caught fire!!

TH350 pan is square with a corner cut off
TH400 pan looks kinda like Texas
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post #7 of (permalink) Old 10-21-2002, 03:24 PM
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Re: Tranny puked out fluid and caught fire!!

Thanks guys!

So what about the driveshafts? Will I need new ones for a TH350 to TH400 swap?

What are my other tranny choices? An overdrive tranny would be really cool! Mnorby, is this basicly the opposite of what you did? Swapping a 4sp for a 3sp?
post #8 of (permalink) Old 10-21-2002, 03:38 PM
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Re: Tranny puked out fluid and caught fire!!

I have had bad luck the the 700R4 overdrive tranny. I have gone through 4 of them now before stepping up to the TH400. Depends on what t-case you use also for drivlines. You may have to get a different case or at least input shaft if you go to the th400 cause it is a 32 spline wheseas the 700 is 27.
post #9 of (permalink) Old 10-21-2002, 05:34 PM
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Re: Tranny puked out fluid and caught fire!!

I don't like the 700 either. I always say if it breaks it wasn't meant to be and its time to upgrade. 400 just makes sense and isn't that difficult. Plus you can beat on it pretty good. [img]images/graemlins/grin.gif[/img]
post #10 of (permalink) Old 10-22-2002, 10:48 AM
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Re: Tranny puked out fluid and caught fire!!

Well, it turns out that I do have the TH400 tranny.

The pan doesn't even come close to being square. And the TH350 gasket is worng.

Hmm. OK. And everyone seems to think that a swap to the TH700 is a waste of time.

Looks like my options have been narrowed down to:
1) Buying a different TH400
2) Rebuilding my current TH400

Man I wish I knew more about trannies! Can anyone reccomend a good resource for instructions on rebuilding the TH400?
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