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Old 01-16-2007, 20:54   #1 (permalink)
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F-150 Rear end problems

Ever since I changed the rear end in my 1991 ford F-150 (3.05gears to 4.10gears), my speed-o's been readin 10mph off and my tranny's been holding out before it shifts. it turns up way too high before finally shifting, then when it does shift, it throws you back and barks tires. I can't figure it out. People keep tellin me it's normal. seems like all that stress on the half-shafts would try to snap them when it jumps. the mph deal is just annoying. any Ideas?
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Old 01-17-2007, 03:42   #2 (permalink)
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Re: F-150 Rear end problems

what tranny?

the speedo thing has been answered a thousand times...try searching for speedo calibration.....its just a purchase of a gear.

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Old 01-17-2007, 17:50   #3 (permalink)
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Re: F-150 Rear end problems

It's got a rebuilt E40D tranny
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Old 01-17-2007, 18:08   #4 (permalink)
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Re: F-150 Rear end problems

tranny is told when to shift by the speed sensor which is what the speedometer gets its signal from, needs to be calibrated for that new ratio.

is the truck 4 wheel drive? hope not, you'll destroy the transfer case in a hurry with different front and rear ratios.
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Old 01-18-2007, 10:41   #5 (permalink)
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Re: F-150 Rear end problems

It's rear wheel drive. that would destroy the transfer case, runnin two different ratios. where can I get the speed sensor calibrated? I can do mech work, but when it comes to all this computer crap, I'm in the dark. I'm a naval helicopter mechanic in corpus christi, Tx. my job is strictly powerplants(engines) though, nothing to do with chips and computers.
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