Diff Cover Drain

[Storm Trooper]

6.29 Rear axles
6.29.1 Any OEM stock differential housing that was originally offered in an eligible model car is allowed. Updating/Backdating of OEM stock differential housings is allowed.
6.29.2 Both GM and Ford cars may also use a Ford 9”, GM 12 bolt, or Dana 44 rear axle housing, but the housing must maintain both the exact OEM suspension pickup points and OEM rear end geometry as the originally equipped axle assembly.
6.29.3 Any gear ratio equal to or numerically lower than 4.11 that fits the stock/alternate differential case without modification may be used. Differentials may be fully locked (welded) or use any commercially available mechanical limited slip.
6.29.4 Any commercially available replacement type steel or alloy steel axles may be used. Full floater axles are prohibited. Heavy-duty non-”C" Clip style axle ends are allowed and recommended. Competitors should carefully select axle ends. Many of the "C" clip eliminator axle ends are designed for street or drag strip use only and cannot withstand the side loads associated with road racing.
6.29.5 Differentials or differential covers may have a drain plug added.

Can some one explain to my why a aluminum diff. cover in against the rules??

[RichardP]

Can some one explain to my why a aluminum diff. cover in against the rules??

Standard answer. It's not needed. If was made legal, lots of people would think they needed one and lots of money would be wasted. The coolest thing about an aluminum cover is the availability of a drain. As a compromise, they allowed a drain be added to the stock cover.

Richard P.

[Storm Trooper]

Standard answer. It's not needed. If was made legal, lots of people would think they needed one and lots of money would be wasted. The coolest thing about an aluminum cover is the availability of a drain. As a compromise, they allowed a drain be added to the stock cover.

Richard P.

(The coolest thing about an aluminum cover is the availability of a drain.) not to mention increasing the capacity of the oil, cooling the oil, supporting the bearing caps.

Big brakes were not needed, 260 hp was not needed! But people wanted them so.....the rules are telling us where not to waste our money?

[RichardP]

not to mention increasing the capacity of the oil, cooling the oil, supporting the bearing caps.

Again, all that crap is overkill and a waste of money (on a 230 hp car with shit tires). At the current state of things, does this need to be revisited? Probably.

Big brakes were not needed, 260 hp was not needed! But people wanted them so.....the rules are telling us where not to waste our money?

NASA, not the CMC management, mandated the S197 Mustang and the LS Camaro. Neither one of them could realistically get to the 230 hp number. Once you've gone there, along with wider and stickier rubber, big brakes actually save money over the old crap that had to be replaced often if you do enough events. Do I like where the whole thing has gotten to? No, and I don't believe many people do. If crap tires were mandated way back when, we wouldn't have needed big brakes and we wouldn't be hurting transmissions, rear ends, etc. at the rate that we are. We are literally tearing the tubs apart on these ancient cars. And we are spending a lot of money doing it. The whole thing doesn't make much sense...


Richard P.