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Old 06-02-2005, 10:19 AM   #1
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Join Date: Jan 2002
Location: LONDON, KY
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Car: Camaro
Engine: Carbed L98
Transmission: TH350
Axle/Gears: 3.73

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How hard is it to rebuild a TH350???

Looks like I am going to switch to a TH350 and keep the 700r4 for a spare. The 700 is ok for now, but not to weekend track use.

I want to use a Transgo rebuild kit from Dana at Probuilt. How many of you have rebuilt you own th350? How much easier is it compared to the 700r4?

This will be my first rebuild, but I am not a newbie as far as working on cars. I have done some engine work and have insalled a shift kit in a th350 before. I have even tore down a PG trans.

I bought the haynes transmission rebuild manual, but would I have been better off with a ATSG?

Everyone with experiance rebuild a TH350 chime in. Thanks


Oh yeah, I can get two th350 trans out of 78 4x4 trucks. I will have to change out the tail shaft and output shaft. One I can get for $85 and the other for $125. A local trans shop said he had the tailshaft and output shaft for $30. Or should I just try to find a complete trans?
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Old 06-02-2005, 11:08 AM   #2
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been a while and i've not done a 700r4, but i'd say the th350 is about as easy as they come. get a good manual and room to lay out the parts and you shouldn't have any problems.
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Old 06-02-2005, 12:09 PM   #3
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Join Date: Jan 2002
Location: LONDON, KY
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Car: Camaro
Engine: Carbed L98
Transmission: TH350
Axle/Gears: 3.73

Classifieds Rating: (2)

Quote:
Originally posted by ede
been a while and i've not done a 700r4, but i'd say the th350 is about as easy as they come. get a good manual and room to lay out the parts and you shouldn't have any problems.
I figured a th350 was a good one to start with. I plan on taking it apart and lay it out on some shelves in order I remove it. Car craft has some good clear close up pics of the building process. Bigger than in the Haynes manual I bought. I just wonder if I should have bought the ATSG instead.

thanks for any advice you guys can give me.
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Old 06-02-2005, 05:24 PM   #4
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Car: '82 Trans Am
Engine: Blown 540 BBC
Transmission: TH475
Axle/Gears: Dana 60, 4.10 w/spool

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Like ede said, TH350's are one of the simplest to rebuild (much more so than a 700R4). If those trans cores you plan on buying have 6 bolt inspection covers, ****** 'em both up because they're HD units! Very simple to convert the 4x4 trans to a "regular" config when performing the rebuild.
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Old 06-03-2005, 09:48 AM   #5
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Car: Camaro
Engine: Carbed L98
Transmission: TH350
Axle/Gears: 3.73

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Quote:
Originally posted by Motor City Mike
Like ede said, TH350's are one of the simplest to rebuild (much more so than a 700R4). If those trans cores you plan on buying have 6 bolt inspection covers, ****** 'em both up because they're HD units! Very simple to convert the 4x4 trans to a "regular" config when performing the rebuild.
After studying the rebuild manual, everything is removed and put together in sub assemblys. It dosent seem to be too bad of a job. I will just take my time, and ask questions if I get stuck. One good thing about the assembly, is that if things dont rotate in the right direction, then I know it is wrong. I can then remove the sub assembly and correct my mistake

Do you mean the Dust cover (inspection plate)? Not trying to be dumb.

If so, I will check the cores out. I want to buy both to have a spare. My friend has 4 extra PG pumps if the one in the TH350 is scared up. The best of my knowledge, they are the same pumps right?

Last edited by bluegrassz; 06-03-2005 at 09:57 AM.
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Old 06-03-2005, 09:58 AM   #6
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Car: '82 Trans Am
Engine: Blown 540 BBC
Transmission: TH475
Axle/Gears: Dana 60, 4.10 w/spool

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Quote:
Originally posted by bluegrassz
Do you mean the Dust cover (inspection plate)? Not trying to be dumb.
Yes. Generally, the HD covers are aluminum with bracing bars going to the engine mounts.

Quote:
Originally posted by bluegrassz
My friend has 4 extra PG pumps if the one in the TH350 is scared up. The best of my knowledge, they are the same pumps right?
No. Chances are the TH350 pumps will be fine though, since they're the gear type which are generally problem free.
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Old 06-03-2005, 10:33 AM   #7
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Join Date: Jan 2002
Location: LONDON, KY
Posts: 3,221
Car: Camaro
Engine: Carbed L98
Transmission: TH350
Axle/Gears: 3.73

Classifieds Rating: (2)

Quote:
Originally posted by Motor City Mike
Yes. Generally, the HD covers are aluminum with bracing bars going to the engine mounts.


No. Chances are the TH350 pumps will be fine though, since they're the gear type which are generally problem free.
Thanks for the info on the cover, I will check them out.
When you say they are HD units, Do you mean the hard parts are better quality or just the case or both? Will there be any differences in the bushing in size or anything like that?

Good to know about the pumps.


What is the best cleaner to use on the case and internal hard parts?

Last edited by bluegrassz; 06-03-2005 at 10:39 AM.
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Old 06-03-2005, 10:33 AM
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