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Rwood93 05-04-2013 08:51 PM

T-350 question
I just started a full restoration on a 86 c10 I picked up. I pulled the trans out today cause I wanted to put a b&m shift trans kit in it. But I'm not sure if its a 350 or 350c. The one thing I did notice is there is a HD mark on the top of the case. Can anyone help or tell me what to look for.

pricesgarages 05-04-2013 11:25 PM

probly a 375 witch is a th400 with a 350 style out put shaft so a turbo 400 shift kit will work
th 350 used till 1980 had rear modulator and cable down shift
th 350c 81-86 looks like a th350 but has a blue square plug on driver side
t 400 or 375 modulator on passenger side and kick down switch on driver side

Hogg 05-07-2013 10:50 AM

The thm-350c was stock in those trucks. I had an 84 GMC Sierra with the 250cid 2 barrel straight 6 with the 350c.
It has the 4 prong square plug which is for the TCC lockup.


Rwood93 05-07-2013 11:14 AM

After cleaning it up I noticed there is the-375 written on it so I'm thinking this was put in in place of the the stock one because the torque converter was replaced as well

Rwood93 05-07-2013 11:14 AM

I meant to put th-375 sorry

cobalt327 05-07-2013 03:21 PM

The TH350C has an electrical plug adjacent to the shift shaft. Some were 4 prong, square plugs and others were two prong like shown below:

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