8.75 Axle problem

The flange that goes behind the fitting the rear u joint bolts to is loose (in front of the bearing on the drive pinion), and making quite a racket going down the road at low speeds. It just spins. Is this going to be a major problem...like I need to fix it now? Or can it wait a few months till I save up some money to fix it? The axle is in my '84 5th Avenue (yes, I know it didn't come with it, friend I bought it from put it in after the 7.25 went), and I don't drive it much.

Look at the casting numbers on the third member on the drivers side under the pinion gear and post the last 3 or 4 numbers, it makes a difference on how to fix it If the third member is NOT a "489" your in luck, if it is a "489" then it takes a little more work. Let us know which one you have

I'd b safe & sit on it till you can swap it out. Not sure if it could toss the shaft or lockup at speed but I'd get another sure grip coming & if there's any doubt about shavings I'd pull the end seals/clean the gear oil out & clean the housing but I'll defer to Kunkel for the final word

Its a 741. Came from a '69 Belvedere.

IIRC 741 has a solid spacer so the pinion can be R&R with out any trouble


are you talking about the pinion seal dust cap that is pressed onto the yoke?

I removed mine when I had my yoke off the 742 case fixing a broken bolt

just tapped it off with a hammer and put the yoke back on

a cutoff/whiz wheel can get it off without R&R of the pinion,thats what I would do

i would replace the seal if you do R&R the yoke also

good luck

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are you talking about the pinion seal dust cap that is pressed onto the yoke?

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Yes sir, thats the one.