02-09-2019, 01:46 PM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,742
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Not really any current style IRS or you could end up with something no stronger than the original Dana 44 or even weaker. You would minimize the potential for breakage with ring gears that are 8.875" in diameter or larger. Additionally you want gears with the strongest tooth profile to again enhance reliability.
There are a number of performance R&P's larger than 8.875 that are decidedly stronger than the Ford 8.8 however, — the ante at those poker tables goes up very quickly. Your best bang for the buck is going to be the 8.8 FRPP IRS stuff.
You will discover some of the more aggravating tender spots in rear ends to be side gears, stub shafts, pinions and yes axles. In addition you will find the low spline count and low grade steel wheel hubs to be a particularly painful weak spot.
The nice thing about the FRPP 8.8 IRS is that they have already broken a lot of that stuff and re-engineered stronger replacements. Of course the Wavetrac is a lifetime warranty irrespective of which unit you buy. That said the smaller units will fail in high power applications that have traction. The good news is, it is warrantied for life. The bad news is you still have to do all the bull work taking it out and putting it back in and replacing the broken R&P.
In the end you should do what you think is best for your car. There is nobody more qualified to make that decision than you are because there is no one else who will write the checks for the decision and then, of course, there is also the bull work. Yup, you either get to do it or you get to pay for someone else to do it
You're call ...
Ed
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Last edited by eschaider; 02-09-2019 at 01:50 PM..
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