I eventually zeroed in on the right rear spring pad as the culprit. From what I could see with the car up in the air, it was dried out, had no give to it and looked off center. Replacement pads were very inexpensive and the process pretty easy with the car up in the air.
As you can see from the pictures, after 14 years the right rear spring pad was in bad shape. I’d suggest you consider replacing these inexpensive parts whenever replacing shocks or springs. That’s what I should have done last year, while replacing the shocks.
Rear Coil springs were developed with performance and comfort in mind. Belltech's Pro rear coils kits come with an OEM quality bump stops. Ride comfort is retained with the load absorbing, OEM quality bushings.
Sorry, missed this one... the manual states it's all to do with weights vs equipment variations hence the reason there are so many different types. The springs in each category must be different in some way but i wouldn't mind betting that if you swapped them around between cars you wouldn't notice much, if any difference, let's face it the QS boasts weight loss but has the same rear springs as a facelift 225
|1980-1996 Ford Bronco and F-Series Stock Replacement Rear Springs (Pair)|
1980-96 Bronco, F150 4x4
4 Pack Leaf Spring
1700lb per spring