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Old 11-14-2023, 11:49 AM   #6
MikeN
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Join Date: Oct 2007
Location: Marietta, GA
Posts: 779
Re: 65 C10 Swapped 3 on the Tree to TH400 - Gearing

Depending on your torque converter, you'll have varying amounts of converter slippage, so RPM's might be a tad higher than with your 3-speed manual, but not too much.

I put a TH400 in my 64, and went to 4.11 gears for drag racing. My rear tires (drag radials) are pretty tall, so I'm satisfied with how it drives around town. I wouldn't get out on the highway geared like this though.
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