Author Topic: TH 350 2WD vs 4WD  (Read 1698 times)

Offline JohnnyPopper

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TH 350 2WD vs 4WD
« on: December 20, 2018, 05:10:09 PM »
Is the difference just the tail stock or is the output shaft different too?

I'm about to be pulling apart a K-10 and figure I should redo the transmission while at it.

I have a TH350 out of a C-10.

Thanks!
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Irish_Alley

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Re: TH 350 2WD vs 4WD
« Reply #1 on: December 20, 2018, 07:18:45 PM »
theres 2 different th350 4x4 tailshafts ( about 7/8" for the NP203 and NP205 and NP208 between 2" to 2 1/2"). and theres 3 different 4x2.
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When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline JohnnyPopper

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Re: TH 350 2WD vs 4WD
« Reply #2 on: December 20, 2018, 09:09:20 PM »
Thanks Irish!

Is the output shaft the same?

I have a NP203.
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Irish_Alley

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Re: TH 350 2WD vs 4WD
« Reply #3 on: December 20, 2018, 10:40:58 PM »
not sure i follow?

no matter what it should be 27 splines and pretty sure its the same diameter. not sure if you can cut a 4x2 output shaft down to make it fit a 4x4 but i imaging you could have a spacer between the adapter plate and trans and then cut the shaft down. or i might be 100% wrong and you might be able to cut the shaft down
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline JohnnyPopper

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Re: TH 350 2WD vs 4WD
« Reply #4 on: December 21, 2018, 01:17:31 PM »
Sorry Irish,

The word Shaft should probably be replaced with output drive that has 27 splines.

I imagine that they have various lengths due to long and short tail stocks.

I have a TH350 mated with a NP203 and have an opportunity to replace it while I have the motor out.

The replacement I have is out of a 2WD C-10.

I guess (unless someone here knows for sure) that I will have to take them out for a look.

Thanks again!
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Irish_Alley

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Re: TH 350 2WD vs 4WD
« Reply #5 on: December 21, 2018, 05:31:37 PM »
well one way is to take the tail shaft housing off the c10 th350 and measure the splines. if you have the first 7/8s of splines after the flange then it would depend on how much you need inside of the trans. if you dont have the 7/8s visible then you'll need a spacer
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes