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Old August 16th, 2012, 07:40 PM   #1
itchy
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TH350 Transmission ????? whats different with the years

I was looking at the adpaters from Advance adapter for the TH350 to NP231 case and they say "This adapter kit is designed for exclusive use with the 4wd GM TH350 automatic transmission. This GM automatic was commonly found stock in vehicles from 1969-81. It was used in both pickups and car applications. The TH350 has an aluminum, 1 piece case and is 21.5 in length. Note: The 1980s version on the TH350 cannot be used with this adapter"

My question....What is the difference between the early and later year 350's. And how do you know which one you have?
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Old August 16th, 2012, 08:05 PM   #2
deerebowtie
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why not stick with a th350 np205 combo?
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Old August 16th, 2012, 11:05 PM   #3
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Quote:
Originally Posted by deerebowtie View Post
why not stick with a th350 np205 combo?
No room for something that big. This is for a CJ5. Its hard enough getting an automatic trans in this thing as it is. Let alone try and get that big ass t/case in there and keep a somewhat flat belly, and have a driveshaft. This jeep is only going to have 33" tires, so there is no need for all that beef.
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Old August 17th, 2012, 04:24 AM   #4
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Not a lot, there were lockup and non lockup s. dont know when they started making lockup Trans s. There are some small changes internally, the pumps, the fluid passageways in the valve bodies.. But nothing that would affect your installation in the jeep, unless you try to out "pump a" into transmission b..

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Old August 17th, 2012, 08:35 AM   #5
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Quote:
Originally Posted by big86inthestixx View Post
Not a lot, there were lockup and non lockup s. dont know when they started making lockup Trans s. There are some small changes internally, the pumps, the fluid passageways in the valve bodies.. But nothing that would affect your installation in the jeep, unless you try to out "pump a" into transmission b..

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This is quoted from Advance Adapter

"This adapter kit is designed for exclusive use with the 4wd GM TH350 automatic transmission. This GM automatic was commonly found stock in vehicles from 1969-81. It was used in both pickups and car applications. The TH350 has an aluminum, 1 piece case and is 21.5 in length. Note: The 1980s version on the TH350 cannot be used with this adapter"

This is what Im trying to figure out. It has to be something with the case or something, that the adapter will not work with the 80's version. I have a trans and dont know how to figure out which year I have. Need to know so I can get the right adapter.
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Old August 17th, 2012, 02:09 PM   #6
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Quote:
Originally Posted by itchy View Post
This is quoted from Advance Adapter

"This adapter kit is designed for exclusive use with the 4wd GM TH350 automatic transmission. This GM automatic was commonly found stock in vehicles from 1969-81. It was used in both pickups and car applications. The TH350 has an aluminum, 1 piece case and is 21.5” in length. Note: The 1980’s version on the TH350 cannot be used with this adapter"

This is what Im trying to figure out. It has to be something with the case or something, that the adapter will not work with the 80's version. I have a trans and dont know how to figure out which year I have. Need to know so I can get the right adapter.
Link to the adapter? I want to figure out what they are talking about or the reasoning for the incompatibility. The only thing I can think of is the lock up version of the trans, but the case is identical except for the plug on the side of the case for the tcc.
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Old August 17th, 2012, 02:58 PM   #7
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Thanks.

http://www.advanceadapters.com/products/50-680x/
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Old August 19th, 2012, 12:18 PM   #8
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Sorry man..cant help ya..rebuilt 100s of these and couldnt tell you why just that year won't work...even when you get into the dual bolt pattern case they are the same to my knowledge. Atleast where the adapter would bolt. Rebuilding two and neither are 80's. Now im curious so im going to watch for the differences.
Sorry i couldn't help. Good luck

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Old August 24th, 2012, 12:24 AM   #9
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From Amazon:

Advance Adapters GM TH350 4WD Transmission to Dana 20 Transfer Case Adapter - The GM TH350 adapter to the Dana 18 / 20 is a short 1.850". And the overall length of transmission and adapter is 23.35". The adapter material is 356 T-6 heat treated aluminum alloy and the adapter has a provision for a transmission. The adapter kit includes a adapter housing, 6 spline spud shaft, bearing, snap ring, o-ring, seal, gasket, fastening hardware and adapter instruction. - Transfer Case - This adapter assembly will fit any Dana Spicer 18 / 20, Scout version with a 6 tooth female drive gear. The transfer case index to the new adapter will require an index retainer & sealed bearing. Please I.D. the transfer case bore size (3-1/8") small hole or (4") large hole for proper retainer. Additional information can be obtained in our on-line catalog, Jeep & Scout Vehicle Section: Transfer Case Information, Jeeps 1941-79. - Transmission - This adapter kit is designed for exclusive use with the 4wd GM TH350 automatic transmission. This GM automatic was commonly found stock in vehicles from 1969-81. The Turbo Hytic 350 three speeds automatic is one of the most transmissions available in GM 4x4 trucks. The stock 4wd output shaft protrudes from the back of the case approx 1". 1980-81 model TH350 4wd output protrudes out 2.750". And this TH350 also uses a lock-up torque convert, and was always used with an aluminum transfer case. We recommend the 1980


From advanced adapters site:

In 1979 GM introduced the TH350-C. This transmission had a lockup torque converter version. The TH350-C lockup version can be identified by an electrical plug on the left side of the transmission. There are several aftermarket transmission suppliers that offer this version coupled with a stand alone TCC control unit. The TH350-C transmissions are often difficult to locate in salvage yards do to the limited years of production. This version of the TH350 is also heavily sought after do to the overall benefits of the lock up feature. The lock up feature of the TH350-C increases fuel mileage at cruising speeds by at least 8 percent. It also aids in reducing generated heat.
The standard TH350 used part codes: M33, M38 & M39. The TH350C used codes: MV4, MX2, and MX3 & MX5.
There were downsized versions of the TH350 especially seen on some Buick applications. These used codes: TH200, TH200C, TH250, and TH250C. A bigger stronger version of the transmission known as the TH375 was also offered, as well as a stronger case known as the “K” case.
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Old August 24th, 2012, 05:12 PM   #10
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Thanks for the info, and clearing that up.
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Old August 24th, 2012, 07:15 PM   #11
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So the only difference is the tail shaft...no biggie, 20$ tail shaft a half hour and a 50$ paper rubber kit and you've got 1979 th350
But little simpler to go other than. 1980. In 1980 they had the np208 t cases, but any th350 that was mated to a np208 wouldn't work without swapping tail shafts.



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