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Discussion Starter · #1 ·
I need to replace the rear leaf springs, shackles and bolts on my swb 66 F100.

My truck has the heavier rear springs as original, I think 5 leaf, maybe 1250lbs rating??

The lighter spring version is one leaf less and maybe 950 lb rating??

Anyway, my question is which would you order for a 400 horse street truck that might go to the track a few times? I've got to replace them so I thought I'd go with which ever my give a little traction advantage.

Thanks for any input.
 

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You need just enough spring to support the weight of the truck, softer in the rear will allow for better weight transfer.
X2! Also longer than stock but smaller coil wire diameter fronts will help it transfer weight from front to rear.
 
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