C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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350 turbo trans

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Old Sep 12, 2020 | 05:25 PM
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Default 350 turbo trans

I'm wanting to have my 350 rebuilt. It's 63 K mile unit & forty years. Leaking at front pump seal. I want at least a stage 2 around at least 5 to 6 hundred horse power. Does any one in Kansas City area that can build one like that???? The freight cost are eating me up. Thank you. Gene
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Old Sep 13, 2020 | 04:12 PM
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1... what’s a stage 2 ?

2.... you want it to handle 500 to 600 hp . I assume you want a manual shift valve body too or does this need to shift automatically?

3 .. is this a 1980 T350C with Lock up Torque Converter ? If so do you want to retain the “ lockup “ feature ?

4 .. have you talked to any local transmission shops and or talked to any repair shops for automatic transmission shop referrals in the local area ?

Last edited by Eric P; Sep 13, 2020 at 04:13 PM.
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Old Sep 13, 2020 | 11:24 PM
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If I was going to pull it out I'd stuff a 700R4 back in or if you have time and money a 4L80E
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Old Sep 15, 2020 | 11:40 AM
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Originally Posted by ratflinger
If I was going to pull it out I'd stuff a 700R4 back in or if you have time and money a 4L80E
Or 200-4R which can be built to handle the HP/Torque and is a more direct fit. Also, the 200 gearing is 2.74, 1.57, 1.00, ( and OD 0.67) which is much closer to the TH350 - 2.52, 1.52, 1.00 and doesn't have the huge jump from 1st to 2nd as the 700 / 4L60 types which go from 3.06 in first to 1.62 in second. The 4L80e is a probably the best combination of gearing, OD, and strength. But it can be a little tight in the tunnel.

In the interest of full disclosure I am wrapping up a TH350 swap to a 4L60E. The reason for the choice was to get the programability of the E types, but I didn't what any surprises fitting in an 4L80E. Not looking to start a debate on this as there are a lot of factors technical, install, and monetary, and each of us will weigh them and decide what is best the best choice for us.

Last edited by vince vette 2; Sep 15, 2020 at 10:31 PM. Reason: one 4L60E should have been 4L80E
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Old Sep 15, 2020 | 07:58 PM
  #5  
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AFAIK, all '82 C3 came with 700r4; in later models that 700r4 was renamed 4L60. Then later, when electronically-controlled, it was renamed 4L60E.

similarly
THM 400 was later renamed 3L80
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