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I didn't realize that the NAPA was on the thicker end. I always thought 90W was 90W. I did look at TSC Ford/GL-1 but when I saw that they had the 40W/non-detergent, I decided to give it a shot. I had seen quite a few good Internet user reviews on the Traveller, and several in-the-aisle...

I did find 40W non-detergent at Tractor Supply and set aside (3) jugs. SKU Number: 0801244. It's Traveller brand. Good enough for me to give it a try in the new transfer case and old transmission for a year unless somebody knows that I'm asking for trouble. Thanks to all for the help. Steve

M-35tom: Thanks. I've been reading your posts and will go with either 40W (Rotella or other; having trouble finding non-detergent) or 2nd choice/GL-1 this time. I'm just trying to sort out if I'm right that the NAPA GL-1 90W equates to gear oil. Thanks again. Steve

I figured I'd post to this thread instead of starting a new one. My last change I used GL5/MT-1 80/90W gear oil off the shelf from PEP Boys. I'm installing a Rockwell-rebuilt TCase next weekend and wondered: 1. I understand that Rockwell has a bit of oil in it already but it needs to be topped...