742 8-3/4 Sure Grip Rear

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mummertj

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Ive been having some problems with my duster and what I thought was clutch slippage turns out its in my rear, Im being told my axles are to short and are not reaching the second set of splines in the rear, Im told there are two sets of splines in each side. Is anyone out there familiar with this and how do I ensure the axles are into the second set of splines
Thanks in advance
 
Kendog 170 said:
Stock axles ? Stock bearings or Green bearings ? Stock rear housing ?
Click to expand...
No Housing is shortened to 46-3/4" axles are Moser axles that I ended up trimming of about a 1/4 inch to get them installed. Had it rebuilt a couple of years ago, just now trying to put it on the road so not sure about the bearings
 
mummertj said:
I ended up trimming of about a 1/4 inch to get them installed
Click to expand...
How did you determine that ?
I would call Moser and ask them what length the axles should be with that width housing and remeasure yours .8 3/4" axle shaft lengths (measured from the tip of the splined end to the outside of the flange)
Stock axle length A body '66-'72= 27 11/16"
8 3/4" Housing widths, flange to flange
A-BODY 66-'72= 52 5/8” (If correct) I cut axles wrong base on false Data once.
Based on your info. your axles should be 24.731" long
Don't trust me though. I based this on info from this Post.
I did not know there were 2 set of splines?
Also, I'm no expert so maybe someone will chime in. Just trying to help.

An accurate 8 3/4" rear axle width list
 
Kendog 170 said:
How did you determine that ?
I would call Moser and ask them what length the axles should be with that width housing and remeasure yours .8 3/4" axle shaft lengths (measured from the tip of the splined end to the outside of the flange)
Stock axle length A body '66-'72= 27 11/16"
8 3/4" Housing widths, flange to flange
A-BODY 66-'72= 52 5/8” (If correct) I cut axles wrong base on false Data once.
Based on your info. your axles should be 24.731" long
Don't trust me though. I based this on info from this Post.
I did not know there were 2 set of splines?
Also, I'm no expert so maybe someone will chime in. Just trying to help.

An accurate 8 3/4" rear axle width list
Click to expand...
My housing is 18-1/2 “ from the face of the bearing hub ( where the backing plate would bolt on )to the center of the bolt at 3 o’clock and 9 o’clock

D7646C91-19CF-4ABE-A28A-F79584714508.jpeg


76D8641B-DCA4-43C3-916A-A0B93E473D26.jpeg
 
Is that how you measure axle lenght?
Measure your Rear end housing flange to flange. Subtract from original Abody flange to flange. Divde the difference in half and subtract that amount from stock axle length.
Thats how I would determine but as I said, I am no expert.
 
since you have the axles out --take your tape measure and extend it into the housing until you catch the end of the splines in your sure grip --this can be done -- now measure back to the face of your housing add 1/8 inch for bearing standout --- now measure the length of your axle from the spline end to the outside edge of your bearing -- compare that measurement to your housing measurement -- you should be within an 1/16 - 1/8 inch either longer ( preferred ) or shorter on your axle measurement for proper engagement of the splines.. measure both sides of your housing and your axles this way.
 
yes the stock sure grip has 2 sets of splines that the axle splines engage into. These splines have to be aligned to get the axle to slide in. Since you drove it their almost undoubtedly not aligned anymore and you'll need to take the 3rd member out and take the sure grip apart and align them. You can slide a tape measure inside the housing as far as you can get it to go into the sure grip and measure to the housing end. Subtract 1/16 to 1/8"" and that's how long the axle needs to be to the front side of the bearing retainer
 
fishy68 said:
If the inner splines are not aligned you can beat it with a BFH till your blue in the face and they'll never go in
Click to expand...
I never said to beat them in. Use the grease as a marking compound to measure how far the existing axles go in. If the side gears are not aligned then it takes around 140 ft lbs to rotate
 
I set my SGs to 120 minimum, for a streeter
If the splines are misaligned, you can anchor the other sidegear by installing the axle and locking it from turning. Then go around to the first side and rotate this axle a tiny bit,(yes with a bar,lol) until it slides into the clutch. Then lock this side and go repeat on the other.
Of course for this to work, the axles and splines have to be at least long enough, to get into the clutches,lol, and the driveshaft must also be locked.
 
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mderoy340 said:
I never said to beat them in. Use the grease as a marking compound to measure how far the existing axles go in. If the side gears are not aligned then it takes around 140 ft lbs to rotate
Click to expand...
I know. Was just sayin because I noticed you didn't say anything about rotating them to get them in
 
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