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#1
10-10-2018, 02:15 PM
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Since I have done a IRS to leaf spring conversion about 50 years ago, if memory serves the rear frame rails are offset to one side. I know I used the rear crossmember from the donor car to attach the shackles to because of the frame rail offset. I had to notch the crossmember to fit over the Tempest frame rails so the leaf springs ran straight back from the front mounting points.
Donor car was a 1962 corvette, and the original fuel tank wouldn't fit under the car after the conversion, I used one from a 62 chevy, and had to move it into the trunk area. BTW did you mean a 1980 F body instead of a 1990?
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Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated    
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#2
10-10-2018, 02:21 PM
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Your Correct
It is a 1980 TA rear end. The builder did a very nice job on the front eye mounts, they are set in the frame rails but both mounts are centered on the rails not allowing for the offset of the rear frame rail on the D.S.
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