Just bought the truck in the last month and a half or so and i've put about 6000 miles on the truck. Since picking up the truck heres what i've already done trying to get it up to par before i start upgrading etc.

Truck is a 2003 2500 6.0L 4l80e with 106k on it reg cab long bed 2wd. 3.73's
  • New 4l80E from a 26k mile conversion van, full custom valve body/shift kit hybrid between transgo hd2 and my local shops setup.
  • both knock sensors/ intake gaskets
  • Crane fire wire 25 ohm wires
  • AC irid plugs
  • bilstien shocks in the back not sure about the fronts yet..

This fixed most of the problems and got the truck turned into a pretty solid all around setup.

Now the the idle RPMS stay the same but i feel sharp missfires every once and awhile. Also when i start the truck it revs to 1000-1100 rpms and usually won't drop until after i've had it in gear and drove it. No codes no nothing.. i'm thinking i have a vac leak or something but maybe not.. but the slight miss fire is driving me nuts.

Next i'm leaking out of the pinion on the rear axle.. this is not my strong suit i don't set gears. Whats the normal procedure for replacing this seal.. many problems with the crush sleeve? magic torq number to set the nut etc..

i've got a ton more questions and ideas but lets start with those since i'm new here and i've already wrote a book.

Thanks!
Brock