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#75853 04/02/2007 4:25 AM | Joined: Apr 2006 Posts: 171 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2006 Posts: 171 | I've noticed that my 1954 1/2 ton differential is leaking from the front side, around where the tube flange mates up with the differential. After reading a few posts ( here and here ) it seems like the culprit is the pinion seal. Could it be something else that is leaking? Is there a front gasket there? If it is the seal, how hard is it to replace it or install one of those speedi-sleeves? Also, is the pinion seal the same thing as a "drive shaft torque tube seal"? I need to take off the differential cover anyway (haven't inspected the diff gears yet and I thought I'd flush the lube). Is the seal repair something I can easily do at the same time, or does it involve taking the whole rear-end and torque tube apart? I'm trying to understand how everything goes together, but the rear axle portion of shop manual is a bit confusing to me... | | |
#75854 04/02/2007 8:46 PM | Joined: May 2002 Posts: 155 Shop Shark | | Shop Shark Joined: May 2002 Posts: 155 | drop the driveshaft, pull the yoke off, if it's grooved you'll have to get a speedy sleeve for it.
Take it with you to the parts house so they can measure it to get the right one..pry out the seal and try not to mess up the numbers on it, so you can get a new one...whole job shouldn't take more than an hour or so..
Geoff
68 GMC 3800
56 JD420C w/JD90 Loader
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#75855 04/03/2007 5:32 AM | Joined: Apr 2006 Posts: 171 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2006 Posts: 171 | I'm a bit confused by your reply Geoff. I don't think there is a yoke (e.g., from a U-joint) on the rear of my truck, so dropping the drive shaft appears to be more involved.
I guess the simpler question is, what is the procedure for separating the torque tube from the differential in my '54? Is that a big deal? I'll probably have to take the whole thing apart to really understand how everything goes together, but I'm trying to figure out how big a deal it is.
In this case, the smallish leak is making for a good excuse to get in there and inspect the whole drive train! Pictures/advice would be much appreciated. Thanks. | | |
#75856 04/03/2007 10:05 PM | Joined: Feb 2001 Posts: 1,096 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,096 | Nice looking truck Greg, here in NZ , the '54 had an open drive line with 'U' joints at front and rear of the driveshaft. In which case Geoffs reply stands.
If your truck does not have a rear 'U' joint , then the torque tube sounds like it is leaking , which is odd , cause there is not normally a problem there. There is not an oil seal there , dismantling the torque tube is an out of the vehicle job and can be problematic.
I suggest you do a couple of things first.
1. Check the oil level in the diff, if it is over full this may be the cause of the leak.
2. Check the breather on the axle casing is clear.
3. If the diff is overfull, check the gearbox level , cause thats where the extra oil in the diff came from, draining down thru the shot seal at the top of the t/tube. Another fun job.
Let us know how you get on. | | |
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