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  1. #1
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    A couple of Differential questions

    Hello all,

    I was wondering if it was possible to put the AT 335i LSD(wavetrac) with the 3.46 gear ratio in a MT 335i with 3.08 ratio.
    The AT final drive does not have the LSD in it yet, I can get a deal on a used final drive and then install the LSD in it and put in the MT 335i.
    Would it work or would it need to be modified more?
    If this already been answered in a different thread please post the link because I can't find anything on this.

    And I hope someone can help me on this problem as well.
    I have a chance to buy a used rear differential for a good price from a 2007 335ix, but when they gave me the VIN number to verify that this is from a 335 and to find out the production date, the VIN was wrong, but they are sure it is from a 335.
    Yes I know you can get the VIN from other parts of the car but it has been chopped up and sold so the diff is the only part that remained.
    So he went and got the part number off of the diff and this is what is on it:

    7566151-01
    E2034V346

    I looked at the realoem website and they have:

    7566152

    Which is one digit off, I want to make sure that the diff they have is for a 335i.
    I called a BMW dealership for help, and they looked it up, they told me it is a part number but it does not say what it is for, no information on it.
    So I am hoping that someone can help me out with this, I don't want to buy it and then find out it is not for a 335i when they install the diff.

    Thanks in advance!!

  2. #2
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    bump, somebody help him please

  3. #3
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    bump, somebody help him please
    Thanks Bro!Click here to enlarge

    If I could get some numbers of the diffs that others have on their diff (335i, ix, auto, and MT) that would help, then I can compare the numbers and see what they have in common.

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    Click here to enlarge Originally Posted by farbmw Click here to enlarge
    Thanks Bro!Click here to enlarge

    If I could get some numbers of the diffs that others have on their diff (335i, ix, auto, and MT) that would help, then I can compare the numbers and see what they have in common.
    You know what, Enrita may be a good guy to ask. He seems to know these diffs well.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    You know what, Enrita may be a good guy to ask. He seems to know these diffs well.
    Cool I will PM him a link to the thread and see what he has to say.

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    I would call wavetrack and ask them it its possible to do that. Concerning the codes i have no idea. I would not buy such part though from a junk yard to save some if they cannot prove it will fit on your car.
    E90post has probably much more info available on differentials than here so i would suggest to ask there as well .
    07 335i AT - MOTIV 750 - MHD BMS E85 - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
    Click here to enlarge

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    1 out of 1 members liked this post. Reputation: Yes | No
    I went for Wavetrack MT at the correct 3.08 ratio. I would avoid AT ratio. The acceleration may suffer if you need to have several gear changes. The mileage will suffer. The stock rear has been well matched to the gear ratios. If you look at your dyno graph and calculate the integrals under the curve at the different rear ratios you will see that the graph being flat you don't gain anything by 3.46 ratio.

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    Click here to enlarge Originally Posted by 654 Click here to enlarge
    I went for Wavetrack MT at the correct 3.08 ratio. I would avoid AT ratio. The acceleration may suffer if you need to have several gear changes. The mileage will suffer. The stock rear has been well matched to the gear ratios. If you look at your dyno graph and calculate the integrals under the curve at the different rear ratios you will see that the graph being flat you don't gain anything by 3.46 ratio.
    Yah, I know a couple of guys that did the ratio 3.46 and they are loving it, but I will look into some more.

    Thanks

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    Click here to enlarge Originally Posted by enrita Click here to enlarge
    I would call wavetrack and ask them it its possible to do that. Concerning the codes i have no idea. I would not buy such part though from a junk yard to save some if they cannot prove it will fit on your car.
    E90post has probably much more info available on differentials than here so i would suggest to ask there as well .
    Great post except for the e90post part. I kid, I understand, hi 5.

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    I like the advice but I would like answers more....oh well.Click here to enlarge

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    Click here to enlarge Originally Posted by farbmw Click here to enlarge
    Yah, I know a couple of guys that did the ratio 3.46 and they are loving it, but I will look into some more.

    Thanks
    So then you know that it can be done. Loving is subjective though, personally I love my 3.08 and I believe it is better than 3.46.

    What ever is said about the part number in the forums, I would go forward based on the seller's info. I would ask Wavetrac, HP Autowerks or another of their dealers if that specific differential fits and works. If they say yes, and it still does not work, you are better of with the refunds.

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    Click here to enlarge Originally Posted by 654 Click here to enlarge
    So then you know that it can be done. Loving is subjective though, personally I love my 3.08 and I believe it is better than 3.46.

    What ever is said about the part number in the forums, I would go forward based on the seller's info. I would ask Wavetrac, HP Autowerks or another of their dealers if that specific differential fits and works. If they say yes, and it still does not work, you are better of with the refunds.
    Not really they paid $4000 for one that was already built, they didn't go the route I am taking, but it must be possible.

    I think it will be wise to ask them, Thanks.

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    does 3.46 make your gears longer or shorter?
    JB4LIFE

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    Click here to enlarge Originally Posted by mazdaspeed6 Click here to enlarge
    does 3.46 make your gears longer or shorter?
    It's is a shorter gear ratio. I believe the M3 has that ratio.

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    Click here to enlarge Originally Posted by farbmw Click here to enlarge
    It's is a shorter gear ratio. I believe the M3 has that ratio.
    $#@! that if anything I would make them a bit longer
    JB4LIFE

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    Click here to enlarge Originally Posted by mazdaspeed6 Click here to enlarge
    $#@! that if anything I would make them a bit longer

    no, definitely shorter. just like going from 3.43 to a 4.11 or 4.56.. shortens the time you are in gear, but gets you there in a quicker time Click here to enlarge

  17. #17
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    2nd gear 4000rpm I'm doing 40mph what rear end would drop my rpm down but be in the same gear and speed
    JB4LIFE

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    I feel with all the tq and hp I have having shorter gears is bad
    JB4LIFE

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    Click here to enlarge Originally Posted by skifreek Click here to enlarge
    no, definitely shorter. just like going from 3.43 to a 4.11 or 4.56.. shortens the time you are in gear, but gets you there in a quicker time Click here to enlarge
    +1!!!

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    Click here to enlarge Originally Posted by farbmw Click here to enlarge
    It's is a shorter gear ratio. I believe the M3 has that ratio.
    3.62 for E46 and 3.85 for E92 M3 manual. DCT is 3.15.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    3.62 for E46 and 3.85 for E92 M3 manual. DCT is 3.15.
    Correct so I would say if I was going from the 3.08 to the 3.46, the M3 E92 3.85 is not too far away and is a shorter ratio.

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    Click here to enlarge Originally Posted by mazdaspeed6 Click here to enlarge
    I feel with all the tq and hp I have having shorter gears is bad
    +1. Tuned car has serious traction problems in shorter gears even with stock ratio.

  23. #23
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    2 out of 2 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by skifreek Click here to enlarge
    no, definitely shorter. just like going from 3.43 to a 4.11 or 4.56.. shortens the time you are in gear, but gets you there in a quicker time Click here to enlarge
    ...and gets you quicker to lose time in shifting Click here to enlarge

    In general, you cannot just directly compare the rear ratio figures across the engines and transmissions.

    For example M3 should have shorter gears than N54 because of the power increasing heavily towards high RPM. The torque to the ground in M3 comes through its gearing. N54 has torque enough at low RPM at a different gearing.

    Also, the rear ratio alone does not mean much if compared across cars or transmissions as the gear ratios are the other factor defining the total ratios.

  24. #24
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    Click here to enlarge Originally Posted by 654 Click here to enlarge
    In general, you cannot just directly compare the rear ratio figures across the engines and transmissions.

    For example M3 should have shorter gears than N54 because of the power increasing heavily towards high RPM. The torque to the ground in M3 comes through its gearing. N54 has torque enough at low RPM at a different gearing
    Thank you, well said.

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    +1, well said. Screw with your gearing too much and you will end up going down a highway at 65mph with 3500 rpm. If that's what you want... If shifting is your thing, you willl love a lower gearing
    + you will lose on topspeed.
    There are two theories to arguing with women. Neither one works

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