Gear Ratio
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Senior User
Joined: Mar 2001
Posts: 296
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From: Maryland
Gear Ratio
OK. Here is what I got, 1982 F150 setp side, 351m, bored 40 over, 272 cam,roller timeing set, Edelbrock Performer 400 manifold, Edelbrock 650. Aussie heads, Headers, Duals. Converted from a 3 speed overdrive to a C6 with BM shift kit. Read gear ratio = 2 47 per tag on rear. I was told it would do 100mph but take a week to get there! The truck will be used as a daily driver and will pull a 1500 trailer once a month. What would you recommend? I was told also 3 90 would work. Thanks Art
Post Fiend
Joined: Apr 2002
Posts: 7,157
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From: Central Kali
Gear Ratio
I would go with a 3.5. I've tried 3.9 twice and did not like it at freeway speeds.Are you sure about the 2.47? I find it hard to believe that a manual transmission came with that. Tire size also makes a difference. 
Thread Starter
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Senior User
Joined: Mar 2001
Posts: 296
Likes: 0
From: Maryland
Gear Ratio
Iam running 31s The tage on the rear reads 2 47. accorging to sll the books I read that is what it decodes to. Befor I change the rear I will try it on the road to see what I got . Thanks Art
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