SH4DY Posted September 27, 2022 Share Posted September 27, 2022 I currently have a 3.7 R200 with an MFactory LSD, WHP 300M stub and CV axles. On motor, the car made 465rwhp and trapped 128mph in the 1/4 which was about 6k rpms in 4th and was pretty much ideal. Well, that was almost 300hp ago. I twin turbo'ed it and now it makes 745rwhp (at only 7psi - plenty of room to grow) which should get it to trap in the mid 140's. With the current gearing, that would require a shift to 5th since I don't wind to wind this motor out more than 6,500. So here are my dilemmas: The 3.36 Ring and pinion for the long lose R200 seems to be unobtainium at this point and the 3.54 isn't enough to get the mph I need in 4th. WHP has closed up shop so even though these axles are rated for 800hp, if I break them, I have no recourse. The R200 pinion flange only has M8 bolts (this is a T56 car so there is a lot of driveline shock). So what do I do now? There's 3 options as I see it: Leave everything as-is and just lift before the end of the 1/4, and hope the axles and diff stay together. Buy a sequential shifter and shift to 5th, and hope the axles and diff stay together. Sell all of the IRS stuff and go with a proper SLA (4 link, Ford 9"). Quote Link to comment Share on other sites More sharing options...
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