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Old 12-28-2004, 04:46   #1 (permalink)
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3.7 diff and ED auto, any shift issues?

hey guys, im thinking of putting 3.7 diff gears in my car and remember reading that the auto wont change gears at the right RPM. i couldnt find any info on it so does anyone know? or has 3.7's behind an auto? any probs with it?

thanks.
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Old 12-28-2004, 06:06   #2 (permalink)
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Re: 3.7 diff and ED auto, any shift issues?

if you get your speedo calibrated it should be OK, but hell i hope you got deep pockets for the extra fuel consumption on the open road :)
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Old 12-28-2004, 07:01   #3 (permalink)
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Re: 3.7 diff and ED auto, any shift issues?

LOL i barely travel on the highway and 3.7's wont increase the rpm to no worse than a 3 speed EA anyway.
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Old 12-28-2004, 13:37   #4 (permalink)
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Re: 3.7 diff and ED auto, any shift issues?

Fuel consumption isn't that much worse with a big ratio diff. I used to run 4.11s in my EA and noticed only a very slight increase in fuel consumption.
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Old 12-28-2004, 13:59   #5 (permalink)
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Re: 3.7 diff and ED auto, any shift issues?

is your car rev limited? my ba gt-p when i changed the gearing from 3.46 to 3.73 being an auto actually hits the rev limiter before it changes gears now!!! if only i had another 500rpm!!!
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Old 12-28-2004, 14:16   #6 (permalink)
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Re: 3.7 diff and ED auto, any shift issues?

i wonder if your car could be fixed byt that new edit thing for the BA's they have now Madmanz
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Old 12-28-2004, 14:20   #7 (permalink)
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Re: 3.7 diff and ED auto, any shift issues?

john if you leave the sender thats for the original diff ratio your shifts will be fine. Your speedo will be incorrect
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Old 12-28-2004, 18:24   #8 (permalink)
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Re: 3.7 diff and ED auto, any shift issues?

ok will check, but so far once we purchased the car new, ford really dont have the time of day for us so i spose thats wot the ford company motto should be, "We'll blow wind up ur ass all DaY!!!
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Old 12-29-2004, 01:17   #9 (permalink)
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Re: 3.7 diff and ED auto, any shift issues?

Karl, should i run a 3.45 sender for the trans seeing as it has the XR Ecu and is programed for 3.45 or just leave it?
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Old 12-29-2004, 01:55   #10 (permalink)
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Re: 3.7 diff and ED auto, any shift issues?

yes a 3.45 gear will make it shift at the right rpm. yours will be shifting early at the momment if it has a taller than 3.45 diff
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