Originally Posted by TopGear96Ranger
What is a ample supply?
Crawl under your truck and look at the driver's side of your transmission. There will be two plugs; the lower one marked "Drain" and the upper one marked "Fill." Remove the Fill plug and check the oil level with your finger. It should be right up to the bottom of the fill hole. If not,either top it up or drain & refill, since you say you do not know when it was last changed.
Be sure to check your manual for the correct type of fluid. My 2005 M5OD-R1 takes ATF; your 1996 may take gear oil.