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Originally Posted by Three Peaks
David pretty much nailed it. The FFR is designed for the Mustang wheels which have a backspace of I think 5" or 6" which doesn't leave much dish for the wheel.
Just my 2 peso's worth- Bob
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Bob,
I keep forgetting that FFR's are basically designed around Fox/Mustang
donors and using those parts with little or no modification, hence the rather
big difference in their axle width options. So they offer a wide IRS assembly
for those wanting IRS with Mustang type wheels and a narrower one for
shallower backspaced wheels like 3.5'. Perhaps FFR should be a little less
liberal with term "pin drive" i.e. they offer a narrower bolt-on IRS that CAN
accomodate shallower backspaced wheels/adapters/etc., but not a true
pin-drive setup with 6-pin hubs.
....Fred