carolinatim

My 2000 F150 5.4 with a limited slip rear end has a shudder when starting off and turning, doesn't seem to do it when starting in a straight line. I thought it was in the transmission but now I think it might be in the rear end. I have read about the 2004 having a TSB on the clutch pack, maybe this is my problem also? The rear is a 3.55 LS

 

kaboom10

You can start with just adding a bottle of modifier to see if that stops it. It's that or change the fluid to the proper weight of Royal Purple lube. I even found by replacing the rear shocks it helped stop it from chattering going around corners. I replaced the stock LS carrier with a TruTrac when I changed rear gears. Made a world of difference.

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2002 5.4L F-150 4wd
Baer rotors w/ carbon kevlar pads, Amsoil filter w/modified air box,
Thrush glasspack muffler, Optima battery,
Kenwood radio, Livewire tuned, Edelbrock shocks,
4R70 trans kit, 4.88 TruTrac rear carrier, Accel 21lb injectors.

67roadwhale

My 2001 f-150 has the same rear in it. I just had the right side rear axle replaced. My mechanic says this is a common problem with these trucks. Ford wanted almost $400 for a replacement but you can find them cheaper.