The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Dually w/ 70HD diff, temp warm at pinion question

JellyBeanDriver · 08-04-2013, 02:47 PM

Working on the ranch truck today - inspecting rear brakes.

Drove it from cold 8 miles from the ranch to my house. Crawled under the truck and inspected the drivetrain, feeling the u-joints, diff, etc and surprisingly found the diff was warm on the pinion shaft end. Axle at the wheels was stone cold. Rear cover was a little warmer but not much. Diff at pinion end was definitely the warmest part.

Surprised that only 8 miles would do this.

Normal? Can pinion preload account for this or is there something more sinister going on?

Thanks

08-04-2013, 02:47 PM	#1
JellyBeanDriver Registered User Join Date: Jul 2012 Location: United States Posts: 268	Dually w/ 70HD diff, temp warm at pinion question Working on the ranch truck today - inspecting rear brakes. Drove it from cold 8 miles from the ranch to my house. Crawled under the truck and inspected the drivetrain, feeling the u-joints, diff, etc and surprisingly found the diff was warm on the pinion shaft end. Axle at the wheels was stone cold. Rear cover was a little warmer but not much. Diff at pinion end was definitely the warmest part. Surprised that only 8 miles would do this. Normal? Can pinion preload account for this or is there something more sinister going on? Thanks __________________ 86' C30 Dually Crew Cab Ranch truck, carb'd 454, TH400, towing a slant load 4 horse trailer.