Been following the wisdom/intellect thinking about a quality and proper viscosity diff oil. A little unclear about 75/140 in new differentials for us who tow in the South West. Thinking heavy viscosity and heat could/may be an issue in our limited slip diff. Don't know that, but like some of you I will over think this one until I find the middle. RL 75/110 seems logical. Just need to follow this thread. BTW our truck group cut open a NAPA "Premium" a couple weeks ago. Wish they would have taken some pics. They claim the quality of internal parts was as good as our RP filters which is what most of us use. We are also hearing that changes are coming with RP.
Temp gauge on diff?? That would not only make good sense, but would be easy to install. Thinking a pillar gauge.