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Swapping the complete rear endYou mean swapping the entire axle out or just changing the gears? Do you have a 4wd or 2wd?
I Bleed Ram Trucks
All 02-08 9.25” rear axles should be a direct fit. 2nd gen truck’s have drum brakes I believe so it probably wouldn’t be worth getting one from there
I Bleed Ram Trucks
^^That. Then you just need to adjust the pinion factor in the TCM. It will run (no limp mode) but things will be off.
Gotta be a reason it's a DRB optionNo need to adjust the computers for gear changes, only tire size
I Bleed Ram Trucks
What is this you all are talking about .Gotta be a reason it's a DRB option
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No he's right, had to go back to the manual and check myself. Pinion factor setting is for tire height. If you swap in an unaltered factory rear, the tone ring will be the same diameter regardless of what ring gear it's attached to and read the same. Just don't change your tire height.No need to adjust the computers for gear changes, only tire size
I Bleed Ram Trucks
That doesn't make sense. Changing tire size changes the effective gear ratio. Changing the rear would be the same thing. Just having done it on some older cars, it definitely threw off the speedo.
I’m pretty sure rams have the abs/speed sensor in the rear differential or the front hub bearings. The rear diff has a tone ring behind the ring gear that has a sensor in the top of the diff. So it’s just calculating how fast the driveshaft/axles spin and the computer adjusts that to the tire size that’s programmed in. It doesn’t matter if it’s turning at a 3.55, 3.92 or 4.56 ratio, it’s reading the tone ring at whatever speed it’s rotating at. That’s why you reprogram for tire size and not gears. In this pic you can see the tone ring behind the teeth or the ring gear. That got swapped from my old oem diff to the new TruTrac unit I put in
That doesn't make sense. Changing tire size changes the effective gear ratio. Changing the rear would be the same thing. Just having done it on some older cars, it definitely threw off the speedo.
I'm also interested in gear swap. I have an 2012 express with the 3.55 gears and anti spin differential. Also swapped to 22 in wheels. Was thinking I'd like the 4.10 gears like the rt model. Whats best option? Buy parts or swap axle?