gear swap

Discussion in 'Fox 5.0 Mustang Tech' started by C. C. Stang, Dec 14, 2003.


  1. C. C. Stang

    C. C. Stang Founding Member

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    I want to swap my 3.08's for 3.73's. The car is an 86' GT with 120,000 miles on it. I have a shop that will do the basic labor I will provide the parts. What do I need to order to do this right ? He said something about rebuilding something so the rear doesn't whine do to the high milage on the car. What is he talking about ? :shrug:
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  2. 1BADCOBRAVERT

    1BADCOBRAVERT New Member

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    The basic parts to buy are the ring/pinion of coarse.
    A crush sleeve and side shims, 3 qts gear lube and friction modifier are a must.
    Yes, you can re-build the posi unit, and buy pinion bearings/seal,
    Inner/outer axle bearings/seals.
    Its all in how much money you want to spend now.
    If the rearend is quiet now then it should be quiet after the gear installation.
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  3. C. C. Stang

    C. C. Stang Founding Member

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    anyone else done gears ?
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  4. billheis

    billheis New Member

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    Yeah I just put my 3.73s in about 4 months ago. All my bearings checked good so I just reused them. I bought a kit that had pinionshims, side shims, seal and rear gasket from year one was only like $28. I also used solid spacer for my pinion but I do mine myself. It take a little fiddling to get right. I should have rebuilt posi, with many mile would be a good idea, I wish I would have done mine while I had it out.
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  5. Katmandu

    Katmandu Founding Member

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    WHere did you get it ??
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  6. goldbomb79

    goldbomb79 Member

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    try looking at nationaldrivetrain.com
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  7. billheis

    billheis New Member

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    Thats a good place or I got mine through Year One. I think the web site is http://www.yearone.com and then click on mustang
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