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Old 04-11-2009, 08:39 AM
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THM350 Tailshaft/end Question

Hi!! I bought a junkyard THM350 out of a 85 gmc 2wd 1500 truck. I'm replacing the stock powerglide in my 67 impala, my only issue is that I bought the 31 (ish) inch long 350 instead of the 28 inch (ish) one, so I must have got one with a 6" tailshaft housing. I don't have all the money in the world, so I was hoping that I could swap tailshaft housings from a correct one at my local bone yard. I can't exchange tranny's so my only option is modify this one or shell out cash for another. And I don;t want to shorten the drive shaft. What all do i need to get/do to swap tailshaft housings? Thanks a bunch
Jake


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Old 04-11-2009, 09:24 AM
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Need to take the tranny completely apart to switch the output and tailshaft housing.

Look around the 'yard for a drive shaft that's the right length- you may get lucky. Check vans and trucks. Sometimes they have shorter d-shafts because they used the long tail tranny.

It's that, a different tranny or shorten your d-shaft. Or tear yours down.

Last edited by cobalt327; 04-11-2009 at 10:06 AM.
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Old 04-11-2009, 10:02 AM
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What all would I need to swap over if I did take it apart? I work at a Chevy dealer so getting one of the guys to help me wouldn't be hard
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Old 04-11-2009, 10:11 AM
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Tail shaft and housing are the main parts.

I honestly do not recall if anything else is required, both times I've done it I had both trannys in front of me (donor and recipient) and a Chevrolet factory service manual, so having the right parts and info wasn't an issue.
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Old 04-11-2009, 10:21 AM
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Thank you VERY much you've been a tremendous help!! One more thing, is there a factory service manual online somewhere where i can dopwnload it as opposed to buying the whole thing? Or could a just use the manual from the 82 chev van?
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Old 04-11-2009, 10:35 AM
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Here's a post from this forum that has some info that will answer the question about a manual as well as shows a tranny being built.


Hope it helps- http://www.hotrodders.com/forum/th35...ch-145361.html

THE manual: "This is a chapter from the 77 Buick Chassis service manual, but most of it applies equally to THM350's from other divisions."
http://th350.netfirms.com/browser.htm

Last edited by cobalt327; 04-11-2009 at 10:59 AM.
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Old 04-11-2009, 10:53 AM
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That has help insurmountably!! Thank you so so so so sos so so much!! Rock on and thank you again for your help. If I can figure out my damn camera i'll post a swap thread. Thanks, Jake
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Old 04-11-2009, 10:57 AM
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At 30-11/16", you have a 9" tailhousing version.

I would hunt for a driveshaft that is approximately 3-1/8" shorter than you PG shaft (assuming you have a long tail PG). Just make sure the u-joints are the same. Assuming your salvage yard of choice has a pile of shafts, that would have to be easier than tearing the tranny apart. Just IMHO.
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Old 04-11-2009, 10:58 AM
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Glad to help!

BTW, the entire section is there in the link to the GM service manual- nothing's missing, thankfully. I will edit my earlier post to reflect this.

This is what was said about the service manual:

"This is a chapter from the 77 Buick Chassis service manual, but most of it applies equally to THM350's from other divisions."
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Old 04-11-2009, 11:02 AM
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Quote:
Originally Posted by redsdad
At 30-11/16", you have a 9" tailhousing version.

I would hunt for a driveshaft that is approximately 3-1/8" shorter than you PG shaft (assuming you have a long tail PG). Just make sure the u-joints are the same. Assuming your salvage yard of choice has a pile of shafts, that would have to be easier than tearing the tranny apart. Just IMHO.
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Old 04-11-2009, 01:02 PM
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howdy there


well, 30 11/16" is what is always listed for the 9" th350, but the actual overall length is 31.5"

9" tail is found under 73-up trucks, and in most wagons, with a few '77-79 or so wagons being 12" tail th350, but very uncommon.

good luck!

Last edited by fast68; 04-11-2009 at 01:33 PM.
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Old 04-11-2009, 02:11 PM
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Which vehicles should I be looking for for a 6" tail? (overall length 28 inches ish, replacing powerglide) anyone interested in trading a powerglide for a 6" TS thm350? Or anyone interested in buying my 'glide off of me?
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Old 04-11-2009, 06:58 PM
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Quote:
Originally Posted by BowTiePride
Which vehicles should I be looking for for a 6" tail?
F, G, H X and Y body cars are a pretty safe bet. A bodies '76-'80, possibly earlier as well.
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Old 04-12-2009, 12:45 PM
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Too long of a TH350 trans.

You might try this before tearing into your trans and swapping out parts. Just find another driveshaft that's 3" SHORTER; should be able to look in a Hollanders manual to find one that will fit. No need to shorten your existing driveshaft, just replace it. Anyone see any reason this would'nt work and be easier?
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Old 04-12-2009, 05:59 PM
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Why can't you take it back to the boneyard and get the right length one you need ?
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