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Originally Posted by imgtx
I have an 84 C10 truck I use as a parts runner. The turbo 350 tranny is going out. A friend gave me a TH400 tranny in good shape and I am going to swap. Upon first inspection I found the dipstick different, No Problem.
It appears the truck frame has multiple places to mount the crossmember and the length is the same (both long tail housings). So far, So good.
The TH350 has two electrical connectors. One two wire on the passengers side and one 4 wire (3 terminals used) connector on the drivers side. The TH400 only has the 4 wire connector on the drivers side. Uh oh?? It that gonna be a problem?
What else am I going to find? Is the yoke the same?
Right now the truck runs and moves but it won't for long. I want to go into this swap all parts in hand so it will be less painful.
Thanks for the help.
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Your current trans is a TH350C with a lock-up converter. Converting to the TH400 will require a TH400 yoke for the trans and the driveshaft will need to be shortened. The trans crossmember will slide back to the correct position, but that and the bellhousing pattern (it is Chevy style, right?) are the extent of the bolt ins. You'll need to make sure you have a dual or large patern flexplate for your engine. The TH400 requires a switch for kick-down and this must be wired up and in place. Not doing so will nuke it in short order.
In all honesty, just rebuild the TH350C, you'll get better mileage, won't spend as much as the swap, and you know it fits.