I would start with the leaf springs. Make sure the clamps are nice and tight, and the same goes for the Ubolts. Then spray some silicone lubricant inbetween the leaf springs, especially around the spacers and the clamp. Also make sure the spacers are still there, and not worn down.
Next, I would make sure the driveshaft isnt causing that problem due to Ujoints going bad. You could get under the truck and give the shaft a yank to see if it moves some, But it shouldnt.
2010 FX4 Screw 6.5ft bed
6in BDS lift, 35x12.50 Open Country's and 18in D1ck Cepek rims
Bakflip F1 and Bedrug, Front Windows Tinted, HD Tails
Catback duals, 4in stainless rolled tips.
Last edited by ruffn-it; 06-06-2005 at 10:23 PM.