8 3/4 Axle issues

[69hemibeep]

Working on a 69 b-body with a 489 center section cone limited slip. Housing is 55" axles are both just shy of 29 1/2" flange to the end. One and maybe both axles are barely engaging the inner splines of the center section. You can see in the picture it buzzed off the end of the splines on a test drive.

 

[davek]

I thought a 489 started in 70. Is it the correct housing? Did you rebuild it and now having this problem? More info please.

 

[69hemibeep]

Its a new build, housing was in the car and I picked up the limited slip 489 from a guy that rebuilt it.

 

[pnora]

Better remeasure things.

Axles.
'65-'67= 28 7/8"
'68-'70= 29 3/16"
'71-'74= 30 5/8"
'71-'73 wagon= 31 21/64"

Housings
B BODY
'62-'63= 53 1/4" (And '64 Max Wedge)
'64 = 55 5/8" (Exc. Max Wedge)
'65-'67= 54 1/4"
'68-'70= 54 15/16"
'71-'74= 57 7/8"
'71-'73 wagon= 59 7/16"

 

[69hemibeep]

I might have missed on the housing a 16th of an inch. Is the axle measured from the inside of the flange or outside?

 

[pnora]

I might have missed on the housing a 16th of an inch. Is the axle measured from the inside of the flange or outside?

Housing should be outside of flange to outside of flange as far as I know.

 

[69hemibeep]

Ok I went out and put a straight edge across the splined end to the outside of the flange and got 29 3/16. The housing is 54 15/16 so all is good on those parts so I'm down to center section or green bearings.

 

[dadsbee]

Why are there 2 retainer plates???

 

[69hemibeep]

One is on the inside against the snap ring on the bearing. I'm not familiar with them I use tapered bearings myself.

 

[R/T Boy 67]

All 8 3/4" center sections are the same overall width, so that is not your problem. As above, there is only supposed to be one retainer plate. Are the bearings pressed on all the way?

 

[pnora]

Ok I went out and put a straight edge across the splined end to the outside of the flange and got 29 3/16. The housing is 54 15/16 so all is good on those parts so I'm down to center section or green bearings.

Or are they some odd custom axles?

 

[RGC440]

Did you remove the old axle seal? With the o ring bearing, you don't need it.
Why is the extra retaining ring still on?

 

[69hemibeep]

Did some green bearing research and it looks like the inner retainer is the problem.

 

[pnora]

Did some green bearing research and it looks like the inner retainer is the problem.

If that was the case the axles could not bolt up to the flange.

 

[RJRENTON]

Working on a 69 b-body with a 489 center section cone limited slip. Housing is 55" axles are both just shy of 29 1/2" flange to the end. One and maybe both axles are barely engaging the inner splines of the center section. You can see in the picture it buzzed off the end of the splines on a test drive.

View attachment 1815898

View attachment 1815900

Perhaps the Green axle bearings CANNOT control or limit the axle's AXIAL (length) movement. Consider going back to the original Mopar Timken tapered axle bearings, which have superior both axial and radial load capabilities. Just my opinion of course......., I'm reasonably sure that the rabid, foaming at the mouth Green Bearing users will disagree........
BOB RENTON

 

[khryslerkid]

This looks like a spacer. Is the C-clip under it?

Might try removing it and see what you have for proper length. I'd remove the O-ring first, remove the spacer then reinstall the O-ring. Maybe it won’t slide over the bearing?

 

[Dave6T4]

My guess is that the green bearing is not installed far enough down the axle, not allowing the spline to enter deep enough into the Suregrip unit.

 

[pnora]

My guess is that the green bearing is not installed far enough down the axle, not allowing the spline to enter deep enough into the Suregrip unit.

If that was true the brake drum would be also sticking out about an inch or more from the backing plate.

 

[69hemibeep]

1. It has to have green bearings for the disc brakes
2. The plate slips right over the O-ring it just sandwiches the snap ring to the outer retainer, I'm thinking it's not needed.
3. It is a possibility the bearing and spacer could press on farther. I'll play with it more tomorrow.

 

[pnora]

1. It has to have green bearings for the disc brakes
2. The plate slips right over the O-ring it just sandwiches the snap ring to the outer retainer, I'm thinking it's not needed.
3. It is a possibility the bearing and spacer could press on farther. I'll play with it more tomorrow.

If the bearing was not on all the way how can the rotor fit properly?