Hauled a 10,000 lbs load with 350 miles on the truck and measured the rear end temps with a infrared gun, 154 degrees after 30 miles @70 mph. Truck can't wait for breakin, it has work to do.

Don't forget to change the fluid after 500 miles of towing. It will get pretty dern used up! And the magnet will be full of stuff.

jb

mine runs 210 all the time.in the middle of summer it will hit 250.mine is plenty broke in.

Sideswiper- You must have a guage, have messed around with different lube and seen difference between them. I suspect most of the lube are very close. I guess I'll change my fluid at 500 mi.s since that's about all this truck does is tow.

i do have a gauge.most syn lubes are the same,dino is not.i will only run syn from now on.you can peg the needle and melt axle seals with dino.i know the hard way.

Sounds like you guys need to invest in an aluminum extra capacity cover with cooling fins.

My 00 Ford CC blistered the paint off the cover, someone told me they used dino in theirs.

i changed mine@2500 miles per gm. I used 2 of the little anti stick tubes gm fluid for the clutches( i don't know what the stuff is called, and then use the synthetic 75/90 like mobil one etc. then your good for 50k. if you don't use that extra additive from gm the clutches will get grabby going around corners.

where do you guys hook up the sending unit to the gauge at? (sorry for the off topic question)

Thanks in advance

Most aftermarket diff covers have a port for a temp gauge sender.

DEWFPO

i drilled and tapped the stock cover.works fine and is leak free

Thanks guys....