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  1. #1
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    Default Changing diff gears

    Hello,

    So I'm thinking about swapping the 2.92 gears in my VIP out for something more favourable like a 3.89 gear set, and while I'm at it bang some new axle seals in . What is involved in changing the gears? Can it be done with the diff still in? Is it a job that can be done at home or are specialized tools needed that a diff shop would have? If it is a shop job what sort of money would it cost?

    Thanks!

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  2. #2
    casual poster Charger408's Avatar
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    It's a diff shop job Winston - unless you've done it before. I'd also recommend 3:55 which is a standard for our valiant diffs. Will still make it rev harder on the freeway -about 3000rpm at 100kph but you will feel the difference at the traffic lights. You might also consider a 4 pinion LSD and 28 spline axle upgrade.

  3. #3
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    Quote Originally Posted by Charger408 View Post
    It's a diff shop job Winston - unless you've done it before. I'd also recommend 3:55 which is a standard for our valiant diffs. Will still make it rev harder on the freeway -about 3000rpm at 100kph but you will feel the difference at the traffic lights. You might also consider a 4 pinion LSD and 28 spline axle upgrade.
    Bummer! I was hoping to actually do something myself. 3.55 gearset was my initial decision, 3.55 is probably the right choice for the application. It would be nice to spend the extra on a new center and axles but I don't want to go too crazy spending, I had planned on a complete diff upgrade in the future but looking at the cost of it makes me sick.

    Thanks.

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  4. #4
    Part of the furniture gtrboyy's Avatar
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    Assuming it's 2 pin borgwarner similar to commo diffs.

    To change seals basically wheel bearing job...need to be pressed back on.

    Diff gears depends on intended driving 3.45-3.7 probably shortest if just streetcar....3.89 are noisey superseded by 3.9 gears

    Last time I think axles bearings/seal cost me $60 to get done & $100 to have xr6 lsd centre(freebie) & 2nd hand pintara 4.11($100) all jammed into vl housing

    3.45 gears out of 6cyl vl can be had cheap or maybe do diff conversion as lot of stuffing around to get parts/labour done at a reasonable price lol.

  5. #5
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    Quote Originally Posted by gtrboyy View Post
    Assuming it's 2 pin borgwarner similar to commo diffs.

    To change seals basically wheel bearing job...need to be pressed back on.

    Diff gears depends on intended driving 3.45-3.7 probably shortest if just streetcar....3.89 are noisey superseded by 3.9 gears

    Last time I think axles bearings/seal cost me $60 to get done & $100 to have xr6 lsd centre(freebie) & 2nd hand pintara 4.11($100) all jammed into vl housing

    3.45 gears out of 6cyl vl can be had cheap or maybe do diff conversion as lot of stuffing around to get parts/labour done at a reasonable price lol.
    Is there a way to tell if its a 2 pin without taking the thing apart like a production number? So a ford center will fit a valiant diff.. interesting. I would assume the ford centers could be bought quite cheap at a wreckers. I'd thought about buying a diff to reco then drop my old one out and bang the new one in, but I've already got the old 2bbl parts a couple of radiators and other stuff I doubt anyone would want to buy stuffed in the boot as I have nowhere to store it.



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  6. #6
    Part of the furniture gtrboyy's Avatar
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    Just assumed all valiant diffs were 2 pinion 25 centres only I've touched was in 360ci vh charger went from 2.92 single spinner to 3.7(cortina gears) & falcon 2 pinion lsd.

    Unsure if 4 pinion centre fits val housing,kinda think they dont.

    But if going 4 pinion better off finding suitable length ford diff that way get all things you want in it.
    Mopparmarket.com forum has cool info on these things

  7. #7
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    Perhaps someone can shed a bit of light on my issue.I have a 73 VJ Charger with a Dodge 400 V8 and a 727 auto. The diff head is 2.92. It does about 3100 revs at 100kph. No idea why it revs so much. Is there another head with a higher ratio that would fit in the standard diff? Im in the BOP Area in NZ. Thanks Lance

  8. #8
    Do you ever leave? EH179's Avatar
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    The rpm at 100kph doesn't line up?
    Do you have a high stall converter?

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    No. it's just a standard converter.

  10. #10
    Part of the furniture gtrboyy's Avatar
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    You'll need to work out tyre size to match with revs then you'll be able guess gear ratio.

    I'd want to check rev tacho is correct first or mark wheel & diff uni then for 1 revolution of wheel count how many times diff uni turned for rough estimate otherwise diff plate off job

    Mine 4.56 gears +27" tyre means 2100-2200 roughly 60km/h

  11. #11
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    the valiant diffs can be fitted with a latter 25 or 28 even 31 spline 4 pinion lsd/ single center. you can fit any 0575 gear set into a val diff. but saying this 2.92 gears come in 2 offsets one fits the later centers the other will not and the only way to tell is by seeing the gears eg diff apart. also the early gears use spacer washer the newer use a crush tube. now there only one true way to find out the ratio take the cover off as there are so many ratios. the hardest part to fitting / setting up b/w diffs is finding the right bearing spacers or making them the right size the rest is ezy as most parts will interchange with each other.

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