FROM THE DRIVER SEAT
After just six hours, our GMC was dramatically improved. We followed the instructions and kept our foot out of the throttle for the first 500 miles, but once the gears were broken in, we proceeded to beat on the rearend as hard as we could. It held up and didn't even break a sweat. This parts combo should hold up to around 500 hp before new axles will be needed, but these core parts will be good to go for the long haul. We chose the 3.73 gear ratio to help our "out of hole" times and initial acceleration and they did just that. The shorter gears get our engine in its power band more quickly, with the only downside being 250 higher rpm on the highway (although we haven't seen any large drop in mileage). Smooth best describes the Eaton Detroit Truetrac, as it seamlessly engages when both wheels need to propel the truck. Extra fluid capacity, thanks to the Mag-Hytec diff cover, will keep everything cooler longer, and our entire setup will last for the remainder of the truck's life.
YOUR QUESTIONS ANSWERED
Time Spent Working: 6 Hours
Degree Of Difficulty: Advanced
Tools Needed:
Pinion depth tool, press for bearings, 11mm wrench, 13mm, 15mm, 17mm, and 19mm socket, torque wrench, pliers, marking paste, digital caliper, drain pan
Parts Used:
Eaton Detroit Truetrac limited slip for 8.6-inch 30-slpine 913A481 $430.99
G2 Axle & Gear 3.73 gears for GM 8.6-inch 30-spline 10-bolt G/22-2021-373 $217.99
G2 Axle & Gear master overhaul kit for GM 8.6-inch 30-spline 10-bolt $93.99
Mag-Hytec aluminum diff cover for GM 10-bolt GM10-8.5 $250.99
Royal Purple 75-90W high-performance gear oil $15.99 (3)
Total: $1,038.93
(prices from 4wheelparts.com and do not include tax, shipping, or installation)
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