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Jul 21st, 2025 | | | | Joined: Oct 2010 Posts: 97 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 97 | Drive shaft moves up and down a little at the pinion attaching point. Been told its a front pinion bearing going and has caused the seal to leak (it is dripping). Can it be the yoke or Companion Flange or is it the Front Pinion bearing. Universal appears not to be loose & movement is rear of the deflector. Is the bearing an easier repair for the new type or one left to the pros? 56 3200 3spd. Tom | | | | | Joined: Feb 2004 Posts: 28,675 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,675 | There are two pinion bearings, and the front one is the only one that's accessible by pulling the yoke. It's also nearly impossible to change the front pinion bearing race from the front. If the bearing is going down, it will have put metal particles all through the rear end. I'd suggest a full teardown and inspection, preferrably by a pro. There are lots of ways to mess up the clearances and tooth contact patterns.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Oct 2010 Posts: 97 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 97 | SOUNDS LIKE TIME FOR THE NEW 3:38 RING AND PINION CHANGE TOO THEN. | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Its probably bad bearings likev the guys said but its possible the pinion nut has loosened up. Drop the u-joint out & see if the nut tightens down without too much pressure.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Oct 2010 Posts: 97 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 97 | Boy you got that one right. I removed the drive shaft and was able to hold the yoke by hand while tightening the pinion nut. I held the yoke with a tool and tightened the nut as much as I could. It appears that there is no more movement and it turns well. I was thinking should I try it like this or should I remove the yoke, check the bearing and install new seal? | | | | | Joined: Feb 2004 Posts: 28,675 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,675 | Try driving a few miles before doing anything else. The most common reason for a loose pinion nut is a deteriorated bearing behind it, and as soon as you tighten it, the bearing will get really noisy, really quick. I'll be surprised if you get 10 miles without nasty noises, and/or a pinion nut that's loose again.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Oct 2010 Posts: 97 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 97 | Thanks Jerry. I will give it a try. Another assist by the Stovebolt Forum. Thanks again. Tom | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Like HRL says drive it a bit & see how it sounds. If it is OK I would take off the nut & clean the threads up. Put some thread locker on it & snug it back up. Now would be a good time to replace the seal if it is leaking. Replace the grease if it hasn't been done recently & it will run a long time.
Last edited by Wrenchbender Ret.; 07/13/2011 7:12 PM.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Oct 2010 Posts: 97 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 97 | Hooked it back up today. Ran fine but the seal is still dripping. I still need to replace the seal. Does anyone know the part number for the seal? I would like to get one before removing the yoke. This is the standard 3 spd trans and rear end. Thanks again for all the help. Tom | | | | | Joined: Oct 2010 Posts: 97 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 97 | Found the part numbers for the pinion seal CarQuest #s. Seal #5778 Front Bearing # 02872 and Race #02820. They had all in stock. Tom | | | | | Joined: Oct 2010 Posts: 97 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 97 | The seal#5778 was too tight. Napa Order the correct seal that looks like the National seal on the truck #17727. Will try this one and let you know. Tom | | |
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