1987 differential change
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Joined: Dec 1999
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1987 differential change
anyone have any exp. with gear change to increase fuel milage and lower rpm....running 4.10 w/turbo and getting 15 mpg at best...3200 @ 70mph....considering change rear gears to 3.08 or probably 3.55 also runs terrific but use a quart to 1000 miles...how about a reply someone thanks
Laughing Gas
Joined: Jun 1999
Posts: 903
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From: Banning CA
1987 differential change
I changed my 87 F250 6.9 with ATS turbo from 4.10 locker to 3.54 locker, I now turn 2900 rmps at 75 mph. I have 215 75R 16 DRW tires on it. It help my fuel mileage a little, but I am still trying to make it better. My problem is I like to keep it up there on speed. With the other gear ratio, the engine struggled to keep up on highway speeds. I now have no problem cruising at 80
Dave
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Dave
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Joined: Jul 2000
Posts: 300
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From: NE Missouri
1987 differential change
Don't forget if you have a good shop change the gears it's going to be $800 to $1000(or more for 4wd) for parts and labor. How long will that take to pay off for 3 or 4 MPG?
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