Rear end swap

[hilby17]

And just adding a little info I recently had a pinion fail and swapped out rear axle from my 02 with 3.92 gears and lsd with a rear out of a 04 2wd with 355 gear and lsd other than swapping ring and pinion out to 3.92 everything was right kept 355 tone ring and installed turns out speedo is still spot on with 33x12.50-20


Sent from my iPhone using Tapatalk

 

[Stoch Hoskinson]

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


I Bleed Ram Trucks

Will the rear axle from a 4.7 truck work behind a Hemi as long as the ratio matches the old rear??