[updated:LAST EDITED ON Jan-28-04 AT 06:41 PM (CST)]I am doing this on my '85 as well. You can upgrade, but you need to look at the length of the springs. There are 2 sizes: 52 in. and 56 in. If the replacements are the same length you can just bolt em in. If they're different (like the 3/4 ton springs I bought) you will need to relocate the rear shackle hanger on the rear springs. If you have to do this, hopefully the holes are predrilled like mine. Here's a good site to look at if you have to relocate the hanger: www.oliverdiesel.com/products/tuffcountry.htm This isn't very difficult skillwise, but it will require A LOT of muscle. Get some friends to help you good luck Craig
