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8 3/4 axle fitment weird #3062320
07/25/22 08:47 AM
07/25/22 08:47 AM
Joined: Nov 2005
Posts: 236
Pasadena, Texas
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fal3 Offline OP
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Pasadena, Texas
I'm having axle fitment problems on passenger side axle. 8 3/4 details: sure grip (clutch); green bearings; 2.76 gears, no buttons. Background: swapped from 3.55 gears to 2.76. (I pulled differential out and sent to axle technician; axles were not worked on) Prior to the gear swap, had zero issues with differential- no leaks, no grinding, no whirring noises, no clunking, turns were not a problem. Situation: driver and passenger axles installed easy. When I torqued brake plate (35 ft lbs) to driver side, I checked for rotation of axle and differential (turned it at yoke) and rotated with minimal effort. Passenger side install was easy, but there were several problems that were encountered. First, passenger side axle flange butts right up against brake cylinder whereas driver side flange is 1" from brake cylinder. Second, and this is the weird part, when I tightened the brake plate, the axle would not rotate 360 degrees; it rotated only 355 degrees and would lock-up like a rod (just for example purposes) jammed the gears. Another way to put it is start at noon, rotate clockwise and differential noon point stops at 11. When you go back to noon, turn it ccw, it stops at 1, and again like a rod was used to jam it. I remove the pass axle and check for rotation. Driver side and differential rotated easily however many turns you want to spin it. So, I re-install pass side axle but do not tighten brake plate. Pass axle goes through complete rotations, brake cylinder though still butts up against axle flange. Again, when I torqued the brake plate, both sides only allowed 355 degrees of motion. This is what gets me.
Honesty time. I'm out of my element here. I recognize there is something amiss, but my lack of detail knowledge on 8 3/4s has kept me from seeing a solution. I recognize there is a spacing issue going on, but I do not know how it could have happened with what I thought was a straightforward remove and replace job. So, I'm calling on the Moparts experts to help out. I live in Texas, and it has been hotter than f$(@ down here which limits my time working outdoors, especially for my age. I'm going to remove both axles and reinstall them to see if maybe (?) the problem solved itself because I did a better job of re-installing axles. Or the Mopar god smiled on me. I will make attempts to check in regularly for updates on info, so my apologies now for not responding in a quick fashion. I appreciate the time you take to respond.

Re: 8 3/4 axle fitment weird [Re: fal3] #3062339
07/25/22 09:20 AM
07/25/22 09:20 AM
Joined: Apr 2003
Posts: 11,642
Looking for a way out of Middl...
IMGTX Offline
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Well detailed post. up

I would have started with the adjuster but you said you have green bearings so my only thought is have you tried bolting in only the passenger side axle to see if it is an axle/side issue? Could one stud be hitting the brake cylinder?

Did the technician swap only the gears? Same limited slip unit correct?

Re: 8 3/4 axle fitment weird [Re: fal3] #3062366
07/25/22 10:30 AM
07/25/22 10:30 AM
Joined: Jan 2003
Posts: 74,128
U.S.S.A.
JohnRR Offline
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U.S.S.A.
Clutch type sure grip has 2 piece side gears , it's possible they have slipped out of alignment. pull the drivers side axle out and shine a light in and take a look at it . It's possble to get the axle in without having to take it all part . Put a wheel on the passside , set it on the ground and with a long bar thru a couple studs on the drivers side try to slip the sure grip by turning the axle and applying pressure inward on the axle .

Otherwise you're going to have to pull the chuck.


running up my post count some more .
Re: 8 3/4 axle fitment weird [Re: fal3] #3062387
07/25/22 11:27 AM
07/25/22 11:27 AM
Joined: Nov 2005
Posts: 236
Pasadena, Texas
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fal3 Offline OP
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The nominee for dumb ass of the year is....Me!! So, I take the axles out, remove brake plates, lay them out in the garage, and stared at them. Low and behold- I've got the brake cylinder on the wrong side of the plate. Put it on the correct side; put the axles in; tightened to 35 ft lbs. And voila-rear end is doing what is suppose too. Thanks IMGTX and John RR for your responses.

Re: 8 3/4 axle fitment weird [Re: fal3] #3062459
07/25/22 01:47 PM
07/25/22 01:47 PM
Joined: Sep 2003
Posts: 17,225
north of coder
moparx Offline
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glad it was an easy fix ! up
and don't beat yourself over this. i do dumb sh$t all the time ! biggrin
beer

Re: 8 3/4 axle fitment weird [Re: moparx] #3062494
07/25/22 03:16 PM
07/25/22 03:16 PM
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nowhere
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Sniper Offline
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I think the important part is that you stopped, stepped back and went for help rather than a bigger hammer.

up

Re: 8 3/4 axle fitment weird [Re: Sniper] #3062733
07/26/22 12:08 PM
07/26/22 12:08 PM
Joined: Nov 2003
Posts: 35,979
Lincoln Nebraska
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RapidRobert Offline
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Originally Posted by Sniper
I think the important part is that you stopped, stepped back and went for help rather than a bigger hammer.

up
X2


live every 24 hour block of time like it's your last day on earth
Re: 8 3/4 axle fitment weird [Re: RapidRobert] #3062755
07/26/22 12:59 PM
07/26/22 12:59 PM
Joined: Sep 2003
Posts: 17,225
north of coder
moparx Offline
"Butt Crack Bob"
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Originally Posted by RapidRobert
Originally Posted by Sniper
I think the important part is that you stopped, stepped back and went for help rather than a bigger hammer.

up
X2




x3 ! the BFH has been used throughout time, and has caused damage a guy doesn't want at times. biggrin [it is also hard on fingers and thumbs. laugh2]
beer

Re: 8 3/4 axle fitment weird [Re: fal3] #3062796
07/26/22 04:03 PM
07/26/22 04:03 PM
Joined: Nov 2005
Posts: 236
Pasadena, Texas
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fal3 Offline OP
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Thanks guys. The responses got me laughing. Yes, I am getting smarter in my old age, but I did give the BFH a look. Cool head prevailed.

Re: 8 3/4 axle fitment weird [Re: fal3] #3062803
07/26/22 04:33 PM
07/26/22 04:33 PM
Joined: Jan 2004
Posts: 7,064
fredericksburg,va
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cudaman1969 Offline
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fredericksburg,va
So.. you had the backing plate on backwards?! Did you change all that stuff too (wheel cylinders, brakes?)

Re: 8 3/4 axle fitment weird [Re: moparx] #3063217
07/28/22 08:50 AM
07/28/22 08:50 AM
Joined: Jun 2006
Posts: 640
Alberta
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rustbuckett68 Offline
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Alberta
If it doesn't fit, force it. If it breaks, you needed a new one anyway!

Re: 8 3/4 axle fitment weird [Re: rustbuckett68] #3063292
07/28/22 12:17 PM
07/28/22 12:17 PM
Joined: Sep 2003
Posts: 17,225
north of coder
moparx Offline
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keep fixin' it til it breaks............ biggrin
beer

Re: 8 3/4 axle fitment weird [Re: moparx] #3063363
07/28/22 03:26 PM
07/28/22 03:26 PM
Joined: Aug 2003
Posts: 40,823
Bend,OR USA
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Cab_Burge Offline
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Originally Posted by moparx
keep fixin' it til it breaks............ biggrin
beer

Dat sounds like a Furd and Cheby racer whistling
I've learned so much from screwing up working on my cars and racing them and then having to go back and correct my mistake shruggy
I'm amazed that I still do it, HOOK on Speed, power and traction I be whistling up wrench boogie
Never quit learning, NEVER twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 8 3/4 axle fitment weird [Re: Cab_Burge] #3063463
07/28/22 09:27 PM
07/28/22 09:27 PM
Joined: Apr 2003
Posts: 11,642
Looking for a way out of Middl...
IMGTX Offline
I Live Here
IMGTX  Offline
I Live Here

Joined: Apr 2003
Posts: 11,642
Looking for a way out of Middl...
I learned more from my mistakes than any book or video.

Experience is learning from your mistakes.
Wisdom is learning from others mistakes.

Glad it worked out

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