TH350C to TH350 swap

[86harleyd]

I have a 1982 chevy 1/2 ton 4x4 that I purchased as a project it has a 305 with a TH350C unfortunately the trans went out. My long term goal is to drop a 4BC Cummins diesel in this truck I would like to keep the auto trans setup, I have heard that the TH350C is not as strong as the TH350. I was wondering if I could have my TH350C converted to a TH350 and what mods would I need to do to hold up to the torque of the diesel BTW the diesel only puts out 150 hp or so. I was going to rebuild the trans then run it for a year or so until I was ready to do the engine swap. Will this work any suggestions ?
Thanks Kerry

 

[foamypirate]

I have a 1982 chevy 1/2 ton 4x4 that I purchased as a project it has a 305 with a TH350C unfortunately the trans went out. My long term goal is to drop a 4BC Cummins diesel in this truck I would like to keep the auto trans setup, I have heard that the TH350C is not as strong as the TH350. I was wondering if I could have my TH350C converted to a TH350 and what mods would I need to do to hold up to the torque of the diesel BTW the diesel only puts out 150 hp or so. I was going to rebuild the trans then run it for a year or so until I was ready to do the engine swap. Will this work any suggestions ?
Thanks Kerry

You can't convert the TH350C into a regular TH350 as the cases are different, I believe.

However, you can replace your TH350C with a TH350 with no problems. You would just leave the TCC Connector unplugged.

 

[crazy4offroad]

Some major differences I found:
http://www.gmsquarebody.com/forum/showthread.php?p=86321#post86321
Some other differences you would have to dig though my thread to find...
Cases are not the same. No wiring header on the plain vs the -C. Input and converter are different. Clutch pack counts are different. Best to start over with a good core. If you start around page 56 of my thread is about where I started with the trans. This is a good read for beefing up certain parts, might just want to avoid the hard-hitting race shift mods...
http://www.crankshaftcoalition.com/wiki/T-350_rebuild_tech
This has good info for beefing up a TH350 too...
http://www.hotrodders.com/forum/t-350-rebuild-tech-145361.html

 

[TIC]

i just ordered a 350 rebuild kit and shift kit on ebay the seller is transparts warehouse. the shift kit has an option with it to convert a 350c to a 350. hasn't come yet, maybe by the end of the week. im going from a 700r to a 350.