8 3/4 Evaluation guidance.

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JF900

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I have an BBP rear that is smooth, quiet, and has very little backlash. So here's my question - I'm in the process of going through my 69 Dart 340 4 speed Swinger and would appreciate thoughts on how I can determine whether or not I should do anything to it while it's out of the car. Should I tear it a part to look at it? Is there any type of external test?
Any and all thoughts would be appreciated!
Thanks!
Jeff
 
Well.....not bein smart, but if you want to inspect it, it's not made of glass, so you caint see into it and there's no rear cover, so you kinda have no choice but to at least remove the axles and the third member to get a look. I would do that at the least. That way, you know what you've got. You won't be upsetting anything other than axle end play and that's easily readjusted.
 
Not many A body rears were born with BBP, so someone has been in it before. Check it against factory specs....
 
Not many A body rears were born with BBP, so someone has been in it before. Check it against factory specs....

NO 8.75 A body rears were BBP, so it may be a B body rear.
 
Thanks Guys. I knew that the rear has been a part. It's 4:11 gears and I knew at least the axles were swapped out to BBP. I'm an engineer and have a machine shop at my place. I've ridden motorcycles all my life (turning 60 next week) and do all of my own work, restorations etc. But I've learned over the years not to mess with things that aren't broke, and rears are something you have to get right, and I have never dug into one. I guess thats why I asked for imput. It sounds like pulling the axles and third member is the minimum I should do. Any details I should know from those with experience? Any thing not obvious I should look at or check?
Again thanks for the help!
 
Any details I should know from those with experience?

If you pull it apart you would check the third member bearings and gears, no need to pull IT apart, unless you find something wrong. While it's apart you might consider replacing the axle seals and repack the axle bearings. If it has the factory roller bearings, you can clean them and repack them right on the axle, you will need a grease needle for your grease gun to get grease packed into the bearings, definitely want those greased well as they get no lubrication from the gear lube. It appears it's been apart and has different axles, so you might have Green Bearings instead of the Timken roller bearings, depending on who did what before you.

Some caution should be exercised when installing new seals, and then when you install the axles as the splined axle ends can damage the seals if not careful.

All you will need is a dial indicator and a magnetic base when putting it back together, to adjust axle end play. IF it has the Green bearings I mentioned then there is no adjustment.

Of course checking the wheel cylinders and all brake hardware and lines would be done also.

If it's a suregrip, be sure and use friction modifier when filling the center with gear lube.
 
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