Hey guys, just wanted to post up some long awaited pictures of my rig after a small lift and some new meats. The lift is a Newtons 2.5" leveling kit in the front, with 4.5" blocks replacing the factory blocks for around 2.5" in the rear also. Tires are 325-60r20 Goodyear Duratracs (advertised as 36.1"tall).
A few questions for any of those who can answer...
1. I noticed that on one side my rear axle is centered in the wheelwell and on the other its offset toward the rear. Anyone else have this? I cant determine if this was the same before and after the lift as I didnt check before...but I do know that theres pretty , much no way to install tne rear blocks incorrectly. They have alignment holes for the leaf spring center pin and axle perch.
2. Is it common (in your opinion) to need traction bars with 4.5" blocks and a 35-36" tire? Ive noticed a slight drivline vibration when accelerating from a standstill that seems like pinion angle and driveshaft angle issues. Not unbearable, just wondering if my logic is accurate.
3. Spartan users with similar mods and tire size....what tune(s) are you guys running? For over a year now with stock tire size ive run this truck on the 250el tune and been very pleased. However with the tire change it seems sluggish, makes excessive boost and really doesnt impress me. While I understand that bigger tires=more rotating mass and they make an already less favorable 3.55 gear ratio taller....it seems like I could improve. I believe swapping to a late lock tune (55 mph lockup vs 45) I will be able to stay out of low rpm high boost acceleration since the bigger tires cause it to lock slightly premature. I also know that tunes have different characteristics (outside of raw "hp over stock" numbers). Ive heard grest things about the 300 el tunes in terms of power, egts, and shifting. I tow light occasionally 6-7000 lbs, and usually drive it pretty kind wnen unloaded with the exception of the occasional soot cloud or quick pull. Not concerned too much with fuel mileage.
Enough of that crap...pictures! Let me know if you have any suggestions!