The Stovebolt Site Forums The Shop Area Driveline stock rear end 1950 3100

How do you get the fluid back in? the drain plug is at the bottom. Do you put it in thru the vent hole? Also what fluid do I replace it with? Thanks

Do you have a torque-tube rear end?

There should be a large filler plug on the rear cover, a little more than 1/2 way up the cover. #14 in this illustration

yes on the torque tube and yes on half way up is that all the fluid i need? and what do i put in it? I also read a post on cleaning it out with kerosene. Put it on jack stands and run it though the gears then flush out and fill. Any thoughts on that?Thru posts i found out about the vent tube, i have one to put on. I figure the fluid has never been changed so thinking i should clean it before adding new.

Remove the 10 bolts & the cover. Drain all the old gear oil. Most of the old oil will run out when you remove the bottom bolts & filler plug. If you find no metal pieces in bottom you're probably good to go and can forgo kerosene flush. Clean all the surfaces & bolts with solvent & dry. Scrap & remove all old gasket debris. Assemble with bead of permatex ultra black on cover & around bolt holes. Original assembly used gasket, but it is not necessary with todays sealants. Original gear oil was 90w but I replaced with 85w-140. Capacity is 2.25 qts.
RdsLessTaken/Don

Cover Removed:
http://s1291.photobucket.com/user/R...20Boards/IMG_4492sm_zpsad880ebc.jpg.html

Assembly:
http://s1291.photobucket.com/user/R...20Boards/IMG_4493sm_zps6fa92b02.jpg.html

Library:
http://s1291.photobucket.com/user/RdLessTaken/library/

Thanks for the info!

If you notice the level of the filler plug on the rear cover, it's slightly above the bottom of the axle tubes. That allows a small amount of the lube to run over to both axle bearings and keep them lubricated as well as the side carrier bearings and the differential gears. The spinning action of the ring gear throws the lube forward to bathe the pinion gear and both pinion bearings in oil as the vehicle runs- - -there's even a groove cast into the center housing for the lubricant to follow as it moves forward above the pinion gear. The ring gear makes a very efficient lubricant pump- - - -I even used to drill and tap a forward-facing thread for a pipe fitting into that upper channel to use as a passage for rear axle lube to be pushed forward through flexible lines to a frame-mounted cooler on the round track race cars I built, using nothing but the spin-off from the ring gear as a pump. The cooled lube returned to the top of the left axle tube through another flex line.
Jerry

Professor Jerry - thanks for taking the time to expand the mechanics in these posts.