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Dead Parrot · 09-25-2022, 06:32 PM

4l80e is a heavier duty trans but it needs a computer controller + some electronic sensors. IIRC it is also enough longer that you will need two new drive shafts.

700R4 does not need the computer and can be bought with improvements that negate the original weaknesses. Don't remember on the length.

My C10 with 350/TH350 + 3.42 gears = about 2800 rpm @ 70. Probably a bit more due to slippage. Current motor has over 100K miles on it.

09-25-2022, 06:32 PM	#3
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,485	Re: Suburban k20 motor 4l80e is a heavier duty trans but it needs a computer controller + some electronic sensors. IIRC it is also enough longer that you will need two new drive shafts. 700R4 does not need the computer and can be bought with improvements that negate the original weaknesses. Don't remember on the length. My C10 with 350/TH350 + 3.42 gears = about 2800 rpm @ 70. Probably a bit more due to slippage. Current motor has over 100K miles on it.