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Thread: differential gear ratios

  1. #1
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    differential gear ratios

    I bought a 99 dodge with a blown up front differential I called dodge and got my gears they said 355 but now I'm driving it and all the tires are. Chirping I looked at other old diff and said it had 384 gear which I didn't know dodge even had if you know anything let me know

  2. #2
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    In 99 the options were 3.55 and 3.92. To be real sure, take off the rear cover and read what the gear says. DO NOT GO INTO 4X4 OF ANY SORT WITH MISMATCHED GEARING.
    Hanson front bumper, Kennesaw rear bumper, Ranch9000xl's w/ remote, Detroit Locker, lots of other goodies

  3. #3
    Super Moderator tomk's Avatar
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    the window stickers were screwed up on the axle ratios for some '99s (like mine), but a vin lookup at a dealer should have gotten you the right parts.

    As mike said, 3.55 and 3.92 are the only possibilities.

    You *might* be able to go to the owners section of dodge.com and get a buildsheet for your VIN. I don't know if they go that far back.

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    Administrator skitzo.d's Avatar
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    The easiest way around this until you get a gear swap is to drop the front drive shaft. I ran for 2 years with 2 different gears. eventually I swapped out the rear and added the shaft back in.

    It doesn't seem to me that it should make a difference as long as you are in 2WD. they didn't make an AWD in '99 as far as I know.
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  5. #5
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    There is a full-time 4x option on some transfer cases for the 99. Going into that could tear up the transfer case or lock it so that it won't shift back out without jacking up the front axle to relieve tension on the driveline.
    Hanson front bumper, Kennesaw rear bumper, Ranch9000xl's w/ remote, Detroit Locker, lots of other goodies

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