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Sometimes synthetics can help, other times it makes shifting worse. Not every transmission likes synthetic.

Yup I'm done with this thread. If you can't read this one or the 15+ other threads and make a decision then I don't know what else to tell you.

15w-40 is used in the engine only. Nobody is arguing that one.

Just go to tractor supply and read the label. The blue bottle is standard motor oil. Red label is non-detergent. The 40wt is usually only sold in 2 gallon jugs not quarts.

Yes gl-5 for the axles and 40wt non detergent motor oil for the transmission and transfer case. If you have a tractor supply near by get the red labeled traveler 40wt oil. Its the non detergent variety. Then go grab a bucket of the traveler 75-90wt (I believe that's the weight) gear oil...

It would work but not the best suited for the job. Gl-5 is much better suited for the axles. The current lube order in the TM's states GL-5 for everything. The previous owner of my truck had gl-5 140wt in the tranny and it didn't shift worth a crap. Switched to motor oil and it drops into...

Go to tractor supply and get the big 2 gallon jug of 40wt non detergent motor oil. Traveler will be the brand. Also I'll say this again, gl-1 is NOT suggested in the TM. Gl-5 is. If you really are fearful if the syncros corroding use motor oil. I don't suggest synthetics either. They are...

https://www.google.com/url?sa=t&source=web&cd=4&cad=rja&ved=0CDEQFjAD&url=http%3A%2F%2Fwww.lubrizol.com%2FDrivelineAdditives%2FAutomotiveGearOil%2FGL5.html&ei=JB6sUdniM8es4APEz4G4Bw&usg=AFQjCNGoKS-pUGw7YjZTXdCVjkGBXpD7AQ&bvm=bv.47244034,d.dmg Actually the lubrication order in the TM specifies...

There's nothing wrong with using gl-1 if you choose. I'm simply pointing out better and more available options.

Gl-1 is only suggested because of the fear that the sulfur additives in some gear oils will corrode the bronze synchro's in the transmission and transfer case. In all reality gl-1 is a primitive and inferior gear oil. Motor oil is a common lubricant in manual transmissions.

Synthetics I really don't suggest. They are a much thinner and slicker lubricant. I know it sounds strange for an oil to be too slick but the syncros don't seem to like it. Thanks on the compliment of the quote but I can't really claim it. I heard Jeramy Clarkston from the British version of...

Gl-1 is NOT the best lube for the tranny and transfer case. It is a very primitive lubricant which is why it is so hard to find. Almost nothing uses it anymore. Spicer specified 30wt non detergent motor oil. 30, 40, 50wt are all acceptable depending on your average ambient temperature. Gl-5...

75w90 is fine for the axles. I am unsure of what to put in the winch. I have heard people mention using corn head grease in the winch but that was in circumstances where their winch was leaking.

Acceptable yes....optimal.....no. Gl-5 is much better for the axles since it has the high pressure additives the rockwells need. The axles do not have yellow metals at risk of being corroded. Your transmission and transfer case however do have synchros that can corrode. Gl-1 or non detergent...

Use gl-5 gear oil for hypoid gears in the axles and sae 40 non-detergent motor oil in transmission and transfer case.