Right now my truck is down, its start of race season. My 91 560SEL has way more power and brakes then my 83 F100 does. Just saying what springs would i need. I lost all my microfiche material in the flood to get spring rates and pn#'s. I Really dont think any spring will handle that much touge weight, Its a light car 2700lbs trailer light too not even 1000lbs. If i could post a pic id show you. I took the Hyd struts off it has the smaller coil rear springs now. I need the stiffest rear spring they have or make with the thickest spring pad also.