TRANSMISSION FLUIDS CAN BE CAUSED BY ONLY A COUPLE OF THINGS. MOST COMMON BEING A WORN OR BROKEN SEAL. THE TRANSMISSION SEALS ON MOST CARS ARE MADE FROM RUBBER OR METAL. BEING IN ALL KIND OF EXTREME TEMPS FOR YEARS ON END NOT TO MENTION THE PARTS MOVING AROUND THEM WILL EVENTUALLY CAUSE LEAKS. ALSO FAULTY INSTALLATION (OF A SEAL) CAN ALSO CAUSE A LEAK TO HAPPEN. THE ONLY OTHER THING THAT CAN CAUSE A LEAK TO MY KNOWLEGE WOULD BE IF YOU BOTTOMED OUT A CAR LOW ENOUGH THAT IT CAUSES DAMAGE TO THE TRANS CASE OR PAN. One cause of grinding when shifting into reverse is improper adjustment of the clutch linkage. If the adjustment is correct when the clutch is depressed the gears should stop turning and eliminate the grinding. Make sure there is some free play in the linkage when the clutch is not depressed. Most manual transmissions do not have a sychronized reverse gear. When you try to go into reverse from neutral, the transmission countershaft (which is linked to the pilot shaft) is still turning. The main shaft (which is linked to the tailshaft) is not turning. Therefore, since there is no sychronizer (or clutch brake like on a heavy truck tranny) the sliding cluctch gear (splined to the main shaft) grinds against the main shaft gear (floating over the main shaft but meshing its respecive countershaft gear through the reverse idler). The slider's function is to lock the main shaft gear to the main shaft thereby transmitting power to the rear wheels in the desired gear ratio (depending on which main shaft gear is locked to the main shaft). The way to cure this is to select a forward gear to stop the transmission and then go to reverse, all the while holding the clutch down. If it still won't go into gear you can either slip the clutch ever so slightly to "bump" the gears while gently pushing the stick into reverse (not too hard!! you can bend or break forks!! OUCH!!) or go into neutral, let the clutch all the way out, go into a forward gear and then reverse.
Feb 26, 2010 |
1999 GMC Suburban