Re: Differential temperatures normal and high
Some of us DO have drilled and tapped stuff to monitor rear axle (and main trans, and aux trans) temps. The D80HD in my sig truck generally pulls at a gross between 34 and 36k. I listened to an awful lot of alarmist stuff about excessive temp burning the paint off of the housing, and, having lost two rear axles under warranty, and then another afterwards, I decided there MUST be some truth to that bother. When I got back to my own shop, I drained the new axle (a month or two later) and got about a half quart of WATER. Now, axles that can burn the paint off don't have water in them!. I had already built the 1 1/2" finned aluminum extension with the magnetic drain bung, filler hole, dipstick and oil temp probe, so in it went. I monitor the temp to use as a load indicator for testing the aux trans. I use the same amplified oil temp gauges for all three, beginning at 140F and ending something like 320F. Well, on level ground in anything but summer temps, the rear axle will never get off the 140F lower peg. It takes a wicked climb at 80-90F in the Rocks to see the max (170 or so) that I have ever recorded.
Oh yeah, I solved my water problem by re-routing the breather line. The current R&P has more miles than the previous three.
2000 F450 Lariat 4x4 tractor, rebuild at 200k in '12, Air Dog, Reg Mod, HX & HP all in hard SS lines, bypass filter, Banks Power Elbow w/3.5 dp, no intake heat, CCV mod, AIS (w/extra hole), some big Alliant single shots, GP indicator LED, custom 4" exhaust, 4" USG exhaust brake, custom alum. rear diff cover extension (dipstick & temp), Detroit locker, ESPAR D5 aux. heat, custom alum tow deck and fuel tanks, Bushwacker 1 1/2" flares, 9k winch, gin poles, JWSpeaker 8900 LED headlamps in XL grille, Lightforce 240GT (still Halogen, but VERY bright), Hella Micro DE HID fogs, KW = vision plus (Isspro) instruments, more to come & lots of other diesels