Join Date: Jun 2001
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Re: Jeep Progress, Gear oil question.
There is no such thing as just "GL-3" oil. GL-3 is a service calssification. The oil must also have a viscosity grade ))(80W-90, 85W-90, 90W-140 etc.) Gear lube is available in GL-1, 2, 3, 4, and 5. The service rating is basically determined by breakdown point, compatibility with certain materials, etc. You can use an oil with a higher rating in an application requiring a lower grade (ie. Your T-176 requiring GL-3 lubiricant can run on GL-5) Most oil sold today will be GL-5 rated.
You must use at least GL-3 rated oil in that tranny. Viscosity is choosen based on a number of conditions including temperature, and condition of the tranny, and, of course, the manufactures recomendations (just like choosing a viscosity for your engine.) ie: most engines made in the last few years recomend 5W-30, but you may choose to run say 0W-30 to allow it to flow quicker when cold, or maybe 10W-40 on a badly worn engine to reduce blow by and oil consumption.
For your application, 80W-90 should be fine.
So, you'll need an 80W-90 weight oil with at least a GL-3 rating (Nearly any gear oil out ther today will meet the GL-3 specs)
'97 Sidekick Sport