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Jul 21st, 2025 | | | | Joined: Jan 2017 Posts: 61 'Bolter | | 'Bolter Joined: Jan 2017 Posts: 61 | So I'm in the final stages of assembly with the driveline on my 49 3/4 ton. I've been looking at the output shaft u joints on the transmission and wondering how they get lubricated. Do they just catch some gear oil splash from off the speedo gears? Should i be pulling apart the assembly to grease them while i have the torque tube off? I never pulled them apart when i rebuilt the transmission because they felt very smooth, and also because i had a hard time finding a replacement online.
Had a hard time finding much for info on this joint in both the manual and online. Thoughts?
Thanks | | | | | Joined: Aug 2018 Posts: 1,003 'Bolter | | 'Bolter Joined: Aug 2018 Posts: 1,003 | A 3/4 ton is an open drive line right?
All my trucks have a grease nipple on each cross, a couple pumps and it squeezes out each cup. | | | | | Joined: Jan 2017 Posts: 61 'Bolter | | 'Bolter Joined: Jan 2017 Posts: 61 | It's enclosed up until the steady bushing. The u joint in question is covered by the torque tube and the transmission housing. No grease nipples | | | | | Joined: Sep 2010 Posts: 1,955 'Bolter | | 'Bolter Joined: Sep 2010 Posts: 1,955 | On my half ton model gmc 9300 with sm 420 the back housing at the back of the transmission has a small plug to fill gear oil in the bell for lubrication for the u joint .the service manual should tell you how much to put in . | | | | | Joined: Dec 2018 Posts: 2,451 'Bolter | | 'Bolter Joined: Dec 2018 Posts: 2,451 | Thorens Stuff like that depends on afog of oil that is generated when moving it must work they are still there ! | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | Lubrication of the enclosed u-joint with an SM420 transmission.The lubricant addition hole is on the upper right side of the SM420 transmission. transmission lubricant additions - up to the hole, if lubricant oil is not warm - 1/2" below the hole if the lubricant oil is not warm To speed things up in filling a empty "cold" SM420 transmission, I take out the gear lever and fill through the top until the lubricant comes out that hole on the upper right side. (put a drip tray under the transmission to catch the "overfill") | | |
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