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#1
11-07-2022, 04:37 PM
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'70 Formula Rear Spring help!
Went to buy some new rear springs for my '70 Formula. Eaton Spring shows 2 different spring part numbers for cars with F60-15's. They're both 126 lbs/inch spring rate, but the LEFT has a 5-3/4 inch free arch and the RIGHT is a 5-1/4 inch free arch. Here's the odd part.....they only did this for 70 and 71 on Trans Ams and Formulas (with F60-15s). Then, in '72 they used the 5-3/4 inch free arch on both left and right sides on the Formula, but then yet a different part number for the TA, with a 6-1/8 inch free arch.
So my question is, why the 1/2 inch arch difference between LH and RH for just 70 and 71? And then why did they go to an even larger arch for '72 T/A? Thanks in advance...... |
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#2
11-09-2022, 12:34 PM
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according to post #2 on this thread: https://forums.maxperformanceinc.com...r+springs+high , different height is because of bias ply tires and road crown, and then the advent of radial tires in later models the height difference wasn't required
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 66 GTO, 495, M22, Strange S-60 w/4.10 Sold new at Ace Wilson's Royal Pontiac http://www.youtube.com/watch?v=cUHC-Z8xhtg |
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