by Shdwdrgn » Mon Dec 08, 2014 12:03 pm
Some people might also consider their speedometer adjustment. You can only tune your PCM for 3.42, 3.73, or 4.10 gears, and the tables only allow up to 30.5" tires. Since you are going with larger tires, it may be possible to tune with 3.73 gears, however there have been some weird interactions with the ABS sensors so it's all trial-by-error. If you go with 4.56's I don't think there's any hope of getting your speedo/odometer anywhere close.
I actually got my rear axle and front diff from ebay. Shipping is killer on this stuff though. The crazy thing was they wouldn't deliver the front diff to my house, but they did deliver the pallet with the rear axle right to my driveway.
GT5/G80, 265/70-16, PCMforLess + personal tuning, quad headlights
Self-made steel front bumper / pushbar / skid / CAI / lightbar