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Thread: Diff Cover Drain

  1. #11
    Senior Member Carroll Shelby Fbody383's Avatar
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    Quote Originally Posted by michaelmosty View Post
    Everything seemed about as even as could be at Hallett between Ford and 1 particular GM from my perspective.
    Fixed it for you...

    I could have done my part and made the first start... not gone off... not overheated and blowed up the transmission.
    #39 CMC Camaro
    Orange is Fast!
    CMC-NT01 FTW!

  2. #12
    lol Brian
    Al Fernandez
    CMC National Director

  3. #13
    Senior Member Carroll Shelby
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    Got it! $150 Aftermarket diff cover is illegal but a $4,000 Ford 9" with aluminum center section is legal.....makes perfect sense.

    Well scratch part of that. Rules won't allow a GM car to swap to the optimal rearend which is the Ford 8.8 (even though bolt ins are available and cheaper). Guess instead of helping my diff stay cool or possibly allowing us to strengthen a known weak rear end with a $150 cover we should just throw $4k down on a 9". I know the rules are there to try and help us save a little money but guess they also allow you to spend a lot of money.
    I remember some about diff cover debate but think that was so long ago that many who argued for or against are gone but really the fact that we have allowed so many other things to happen that an upgraded diff cover doesn't seem like a big deal.

    Glad this came up before Nats so I don't get DQ'd for a diff cover. Guess I'm ordering a Ford 9" for my birthday.
    Bryan Leinart
    CMC #24

  4. #14
    Senior Member Carroll Shelby RichardP's Avatar
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    To be fair, allowing the Ford 9" was a cost saving measure mostly aimed at allowing A Sedan cars a way into CMC without having to spend big money converting their cars back. It had no realistic effect on those building a CMC car because no one would be dumb enough to add the expense, drag, and weight of a 9" when the stock rear ends were bullet proof on cars with 230 HP, 16" rock hard tires, and 12" brakes...


    Richard P.

  5. #15
    Senior Member Carroll Shelby
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    What is the failure mode for gm rear ends in CMC?

    My first one went simply because the ring gear boots were loose, and even then it was fine except for the broken teeth from loose bolts flying around.

    I chipped a ring tooth on the second one but I had issues with that build with a loose pinion nut, and later running it all setup wrong and super tight when we took my rear end apart for no reason at all at the track.

    I think just a properly setup rear end with a crush sleeve eliminator and heavy oil is all that's needed. I run 85w-140.

    That fancy diff cover just adds support to the main caps. I don't believe we're drag racer blowing apart rear end housing are we?

  6. #16
    Senior Member Grass-Passer
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    I've had good luck with RCR's if you think it's dumb (plain rotors,broken crankshafts) put in a solid RCR and things may happen. I thought a 8.8 was legal in CMC?
    Read extreme ownership by Jocko Willink, I take this approach with my team, before passing blame did you do everything you could to "win" (I'm in sales).

    I figure a lot of the GM Ford stuff is just for fun, but if it's a real issue, you have the power to do something about it.

    I agree, a 4k ford 9" legal but a cover isn't is BS, but that hasn't been an issue for me so I didn't try to change it.
    Tyler Gardner
    CMC #13 2015-2017
    SM #013 2018
    www.dfwmustangs.net

  7. #17
    Senior Member Grass-Passer
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    Quote Originally Posted by Pranav View Post
    What is the failure mode for gm rear ends in CMC?

    My first one went simply because the ring gear boots were loose, and even then it was fine except for the broken teeth from loose bolts flying around.

    I chipped a ring tooth on the second one but I had issues with that build with a loose pinion nut, and later running it all setup wrong and super tight when we took my rear end apart for no reason at all at the track.

    I think just a properly setup rear end with a crush sleeve eliminator and heavy oil is all that's needed. I run 85w-140.

    That fancy diff cover just adds support to the main caps. I don't believe we're drag racer blowing apart rear end housing are we?
    Wheel hop killed Paul's 10 bolt, because the torque arm bolts were finger tight, wheel hop is savage on parts.
    Tyler Gardner
    CMC #13 2015-2017
    SM #013 2018
    www.dfwmustangs.net

  8. #18
    Senior Member Grass-Passer Supercharged111's Avatar
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    Mine came with the fancy solid shims and crush sleeve eliminator and hasn't blown up yet. The diff on the other hand seems to unload on right handers.
    RM CMC Director

  9. #19
    Senior Member Carroll Shelby
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    Quote Originally Posted by mach1 View Post
    Wheel hop killed Paul's 10 bolt, because the torque arm bolts were finger tight, wheel hop is savage on parts.
    Oh yeah, I only learned how to start heel toe-ing last summer. My first rear end lived through 5 years of that hop life

  10. #20
    Senior Member Carroll Shelby
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    I'm looking at 4th gens in Texas in general, and I'm seeing all kinds of issues that prevent each particular driver/car combo from running up front. Be it breaking things unexpectedly, reliability, or the driver just not doing enough testing/setup time to win.

    I'm not trying to put my fellow 4th gen drivers down, but spend an afternoon observing what the Fox guys are doing vs the 4th gen guys in regards to what they're focused on (or even present) on Fridays before the race, and you may see my point. I feel like the combination of new/fresh talent on the Mustang side, the departure of Proctor/Landrum, and the timing of the rule changes all happening at the same time seems to perpetuate the impression that there is an apparent rule bias against 4th gens.

    The RMR guys are saying mustangs are getting their butts kicked by Camaros up there.

    Yeah the Mustangs have a weight advantage, but they have shit aero and suspension.

    Francis has been able to put his car far up there from time to time when it has run right and it (no offense) has the least fanciest gear of the others. Tyler hopped in Sean's car (3rd gen, but still) and was able to put it up there at COTA after working on setup.

    My car's been running like a swiss watch and has all of the right parts/numbers to win, but I haven't been put it together as a driver to get it done myself.

    At this point performance wise I'm (by choice) weighing 50lbs over post race (I have more than enough extra gas and coolsuit capacity to take it down to zero if needed), and getting closer and closer to 260/310 with the new motor after making tweaks. All that's needed is setup time and a good driver.

    We should put Tyler in my car and see how far up he can place vs the big evil Fox mafia.
    Last edited by Pranav; 06-27-2018 at 05:27 PM.

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