1971 Chevy C10 transmission

Honey Badger · Jul 26, 2024

So, my amazing father-in-law gave me a 1971 Chevrolet C10 pickup. It has a freshly rebuilt 337 motor, with a three speed automatic transmission. My question here is would you keep that transmission?, or would you change it out for a turbo 350? or? Are they basically the same thing? Thanks in advance.

Mr.Glock · Jul 26, 2024

Leave it alone. That Hyrdamatic is a good transmission. Question is is it a 350 or 400? I bet if the truck is an original 327 it will be a 350 Turbo Hydramatic. The signage states it was a 350 from factory. Wonder why it was replaced with a 327? Hopefully he still has the original 350 it came with.

Nice gift you received. Are you going to restore it?

Honey Badger · Jul 26, 2024

Mr.Glock said:
Leave it alone. That Hyrdamatic is a good transmission. Question is is it a 350 or 400? I bet if the truck is an original 327 it will be a 350 Turbo Hydramatic. The signage states it was a 350 from factory. Wonder why it was replaced with a 327? Hopefully he still has the original 350 it came with.

Nice gift you received. Are you going to restore it?

Yes sir. I am going to restore it. But add a few style upgrades. Rims. Dual exhaust. Stereo. Ill redo the paint to the original look.

Shinneryfarmer · Jul 26, 2024

Had 3 of those trucks, 2 1970's and a 1972. Wish I never sold any of them, those were well built trucks. One of life's regrets. Don't make my mistake, restore and cherish it.

Honey Badger · Jul 27, 2024

Shinneryfarmer said:
Had 3 of those trucks, 2 1970's and a 1972. Wish I never sold any of them, those were well built trucks. One of life's regrets. Don't make my mistake, restore and cherish it.
View attachment 497277

This one belonged to my Wife’s grandfather. Then her Father, now me. It will stay in the family. Love that blue on yours.

DaveinOKC · Jul 27, 2024

Did you say it has a 3 speed automatic? It is likely already a TH350. Could be a small chance it is a TH400. Either way you should be good to go unless you want to swap in a 4L60 or 4L80 to get an overdrive.

David

turkeyrun · Jul 27, 2024

^^^^^^^

Upgrade to a 4 speed or leave it alone.

The overdrive will do wonders for gas mileage and driveability, but that 3 speed is bomb proof.

Measure trans to determine if TH350 or 400. The 400 is longer.

67RS/SSx2 · Jul 27, 2024

You can just look at the pan shape to tell if it is a TH350 or 400. A 200 4R is an overdrive transmission that will directly swap from a 350, but the 200 4R is a little harder to find. If you are just driving around locally and it is shifting okay, leave it as is. I have a 1972 C20 and really enjoy driving it.

I also wonder why it was swapped to a 327.

Honey Badger · Jul 27, 2024

67RS/SSx2 said:
You can just look at the pan shape to tell if it is a TH350 or 400. A 200 4R is an overdrive transmission that will directly swap from a 350, but the 200 4R is a little harder to find. If you are just driving around locally and it is shifting okay, leave it as is. I have a 1972 C20 and really enjoy driving it.

I also wonder why it was swapped to a 327.

My FIL seems to think it is factory stock. The 327 that is. I can ask.

Honey Badger · Jul 27, 2024

So I called my FIL. He said the 327 is a different motor than what came in it. BUT he said I thinks the 327 was a factory motor for this vehicle. Also he said it has 4 wheel disc brakes and was one of the first models to have that. I “think” I read somewhere that that model came with a 350 from the factory. He also seems to think the trans is a turbo 350 hydromatic, or the equivalent.

1971 Chevy C10 transmission

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