Gear ratio question

bmerkley58 · Post by **bmerkley58** » Wed Jan 18, 2006 6:31 pm

Does anybody know what rear gear ratio was used with the T85N overdrive transmission in a 67 -72 F100 2WD with the 352, 360, or the 390?

Bob

Jake11 · Post by **Jake11** » Wed Jan 18, 2006 9:14 pm

You'd have to look at the tag on the diff.

bmerkley58 · Post by **bmerkley58** » Wed Jan 18, 2006 9:45 pm

The truck I have did not come with the overdrive transmission from new. I am going to put the overdrive transmission in this truck. Looking at the tag on my rear end won't tell me what rear end ratio these trucks had when you ordered the optional overdrive transmission.

Bob

fordman · Post by **fordman** » Wed Jan 18, 2006 10:14 pm

if your worried about the spedometer being correct when your done just get another speedometer gear to fix the problem. if your asking because of torque reasons then i can't help you i don't know the answer.

bmerkley58 · Post by **bmerkley58** » Thu Jan 19, 2006 5:10 pm

The reason I want to know the ratio is because of torque.

Bob

fordman · Post by **fordman** » Thu Jan 19, 2006 6:14 pm

i think a 3.50 and up would be ok but i'm not an expert.

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Gear ratio question

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