engines should be broke in hard. rear ends should be broke in lightly. the best truck my family ever owned was a 85 Suburban with a 350. It was pulling a huge camper all over the country for the 1st 50,000miles on the thruway from the day it pulled off the lot. The think got 17mpg and had more power than any 350 or 5.3l iv ever drove. that thing would roast the tires with ease.
2012 2SS/RS M6 SIM, Painted Carbon Flash rally stripes, Elite CC, 3.91 gears, dynoed by J&J Speedshop New Era ported TB, CAI intake, Heritage Grill, Pat G Cam Motion cam, 25%Fluidampr, Melling 296 Oil pump, Katech C5-R chain, Cloyes LS2 HD tensioner, PAC 1205x springs and Comp Cams trunions. Improved Racing oil baffle, crank scraper, Monster Billet release bearing support, 18" remote bleeder, ARH 1 7/8" LT headers w/cats, TWM full Shifter, BMR sways, trailing arms, toe rods, delrin cradle bushings, BK039 rear control bushings, front bushings. Solo Mach-XL exhaust