Originally Posted By: Click
I plow with an 89 Jeep Grand Wagoneer 360, 3 speed auto tranny. I drive about the same, 500 miles a year, mostly a few neighbors and myself and some inlaws, then parked in the barn till next snow season. The last thing you want is any part of your drive train to struggle or fail. I would use AMSOIL SVG 80-90 in BOTH differentials and then what ever syn fits your transfer case recommendations, most likely a motor oil, again I used Amsoil front to back including my tranny. You can pretty much count on never having to replace the fluids again either with the low miles you are driving, its a one time shot, why not use what is the Best for your rig, not what is the cheapest.
The heat and stress that plowing puts on your truck is amazing. Pushing 750 lbs of snow 50 or 100 feet over and over is really hard on especially the tranny. When you start out in the morning in Maine at zero degrees you want your differential gears moving right away. My 2 cents worth.
Use the Locator on Amsoil's webpage, you can probably find what you need locally or PM Pablo here for his 'specials' .
Nice ride, always wanted a Wagoneer... At this point I'm leaning towards synthetics maybe a 75w-140 for the rear. I'm not confident in a 90wt protecting my worn rear diff if I have to work it hard in the summer. The front end will probably get a 75w-90. The trans is a TH400 and will likely get Castrol Dex/Merc along with the transfer case.
Thanks for the suggestions.
