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2004-2007 Cadillac CTS-V General Discussion Discussion, new gen 4 diff, which oil? also broken out of the box ugh in Cadillac CTS-V Series Forum - 2004 - 2007; max - I PM you wow, surprised to see the variety (lets call it variation) in fluids used. In the ...
  1. #16
    bneal1022's Avatar
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    max - I PM you

    wow, surprised to see the variety (lets call it variation) in fluids used. In the quality world variation is the enemy

    still stumped on which weight amsoil? 75w-90?

    my original did quiet a little with the RP, but i see nobody else using it. That should be a hint I guess. Like most, just want the BEST fluid for the diff right out the gate is a brand new unit. I may track once a year.

  2. #17
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    I broke mine in with the GM stuff at a track day actually.

    Swapped in RP 75W-90 after, I have a smidge of whine...but nothing compared to the way my 1st gen sounded...

  3. #18
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    Quote Originally Posted by bneal1022 View Post
    max - I PM you

    wow, surprised to see the variety (lets call it variation) in fluids used. In the quality world variation is the enemy

    still stumped on which weight amsoil? 75w-90?

    my original did quiet a little with the RP, but i see nobody else using it. That should be a hint I guess. Like most, just want the BEST fluid for the diff right out the gate is a brand new unit. I may track once a year.
    Yes, 75W-90...

  4. #19
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    Indeed.

  5. #20
    PISNUOFF Guest

    Re: new gen 4 diff, which oil? also broken out of the box ugh

    Hmmmmmmmm.





















    LOL.

    I have the 75W110 Severe Gear in there now and it's a little quieter. Mine screams like a pig at 45-50 mph with the GM stuff, I can hear it loud and clear over the B&B exhaust. I'm moving up to the 75W140 next time.

  6. #21
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    It seems to me that one possible contributing factor to the gear whine is wear and tear on the ring and pinion gears when cold. I say this because the differential lubrication system has no "oil pressure" and relies solely on splash lubrication. So, if you start running the car hard before the differential gets up to its operating temperature wear could be accelerated as compared with operation once it is warmed up. I use the transmission temp gauge as an indicator that the drive line is warmed up because it takes much longer than bringing the motor up to operating temperature.

    The point of all this is that if you choose to go with higher viscosity fluids, I would advise even more warm up time before engaging in hard acceleration.

    Of course this is just a theory.

  7. #22
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    Makes sense...

  8. #23
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    Quote Originally Posted by darkman View Post

    Of course this is just a theory.
    remember, you can only disprove a theory. Proving a theory makes it a law.

  9. #24
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    redline shockproof light gear oil havnt put it in my v yet but used it in my other cars and its best oil out there for diffs and trannies

  10. #25
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    so you would use the "light" shockproof which is like a 75w140 over the 75w140 gear oil? whats the difference? betweent he shockproof and the gear oil? would you still use additive? why so thick? should it not be 75w90? why have you not put into V?

    i'm about to close my eyes and point at a fluid.... just want a chatter & whine free new diff with proper protection for 2 day/week driving in PA with 1 track day a year.

  11. #26
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    what about the Redline lightweight shockproof gear lube + additive? It is designed for splash lube as our diffs are, and has a heavier weight (as i see many above 75w90 into the 140 range). will still get additive to add as required... thoughts?

    http://www.redlineoil.com/product.aspx?pid=43&pcid=8

  12. #27
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    Bleal you seems to have some good differential knowledge .

    Im finding alot of 06-07 diffs for sale for some sweet prices (157*** part number)

    Would you suggest upgrading to one of these ? or should I not bother and wait till I can get a Gen 4

  13. #28
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    Quote Originally Posted by maxspeed96ct View Post
    Bleal you seems to have some good differential knowledge .

    Im finding alot of 06-07 diffs for sale for some sweet prices (157*** part number)

    Would you suggest upgrading to one of these ? or should I not bother and wait till I can get a Gen 4
    Unlikely you find a a used GEN 4 for cheap, so it's probably dealership which will take you to cleaners. Now the 157 part number diffs are all over Ebay for cheap, but remember if it ain't 3.73 gearing it's not from the CTS-V, there are cheap 157, but with different gearing. When you find the 3.73 diffs they range from $800-1000, the odd few slip through the cracks on ebay for $550-650 price range.

    I have a updated GEN 3 and axles collecting dust in my shop if anybody needs one.

  14. #29
    maxspeed96ct is offline Cadillac Owners Connoisseur
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    Quote Originally Posted by TroyFleming View Post
    Unlikely you find a a used GEN 4 for cheap, so it's probably dealership which will take you to cleaners. Now the 157 part number diffs are all over Ebay for cheap, but remember if it ain't 3.73 gearing it's not from the CTS-V, there are cheap 157, but with different gearing. When you find the 3.73 diffs they range from $800-1000, the odd few slip through the cracks on ebay for $550-650 price range.

    I have a updated GEN 3 and axles collecting dust in my shop if anybody needs one.
    junk yards around the us, cleveland pick a park and ebay always have 157*** 3.73 limited slip V diffs for cheap (~$500, seen a few for even less).

    Im running a gen 1 diff, And id like to one day upgrade but im tryin to decide whether to upgrade to the 157**** or just keep saving and buy a new gen 4

  15. #30
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    Re: new gen 4 diff, which oil? also broken out of the box ugh

    max.. the part numbers i gave earlier are all 3.73 the key to the final diff solution is the robust prop shaft boss on the front of the diff. The case of the gen 4 is meatier and better structurally. I can't explain the "diff" between the diffs (get it, diff joke), until the latest. If interested I can likey get you the same offer for a new gen 4 i got on mine. Just talked about it with my friend at the parts counter last night. PM me if interested.

    I woudl reccommend just finding a way to go for it all and get a 4th gen. I will be installing it with my newer Gforce passenger side econo axle and DMH cutouts...

    i think I will use the redline lightweight shockproof gear oil with 1oz of additive as needed. unless others object (i'm listenting)
    http://www.redlineoil.com/product.aspx?pid=43&pcid=8

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