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Old 10-14-2019, 07:14 PM   #33
tdangle
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Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,209
Re: Engine vs Trans vs gearing

Pretty much the rule with today's highway speeds is with at 1 to 1 final drive ratio on the trans, don't go lower than about 3.5:1 with the gears. An overdrive trans (usually .7 or so) go with 3.7 to 4.1 I have a OD auto trans with 4.10 and it is a nice combination.
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Terry

1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC
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