1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

quick rear end question....

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Old Dec 10, 2010 | 10:11 PM
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elmerxfudd's Avatar
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From: vermont
quick rear end question....

can you swap rear axles between the gsl (4x110) and gsl se (4x114.4).

not the whole housing, but can i put the 4x114.4 axles be put in the older gsl housing and dif.

I have a lsd 4x110 rear end that works great, and a 4x114.4 rear end that the lsd s toast. was thinking the 4x114.4 axles in the working lsd housing would be good. to go along with the big ft end swap.
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Old Dec 10, 2010 | 10:25 PM
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From: https://www2.mazda.com/en/100th/
the axle housing is the same for the 84-85 disc brake cars. so the axles interchange.

the 81-83 disc brake axle housing is different, as it uses smaller bearings
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Old Dec 10, 2010 | 10:51 PM
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Originally Posted by j9fd3s
the axle housing is the same for the 84-85 disc brake cars. so the axles interchange.

the 81-83 disc brake axle housing is different, as it uses smaller bearings
I thought the GSL diffs and subsequently the axles had a different spline count than the GSL-SE?

Edit: after a quick search guess not, must have been talking about the small bearing vs. big bearing.
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Old Dec 11, 2010 | 05:46 PM
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From: vermont
good to know, I got unlucky I guess as my gls rear end is a 82.
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Old Dec 11, 2010 | 07:58 PM
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The 81-83 and '84-85 diffs are the same except for the side gears, so if you're confident that you can pull a diff apart, you can disassemble them both and swap the late gears into the early case.

Or for that matter, if you're pulling it apart that far, you can do a cheap "regrip" and buy two friction plates. GSL-SE had only one friction plate per side, GSL had two (the -SE had an extra steel plate to make up the gap) so you can put a new friction plate in a GSL-SE to replace the extra steel and be good to go. Or do what I did and stick a .010" bearing shim underneath the end of the stack where it won't see any twisting loads. Two .010 basically made my worn out diff a spool, one brought the breakaway torque up to about 120ft-lb.

I have a few Series 3 disk rears, I don't know what started life as GSL and what was GSL-SE anymore. I have two sets of GSL-SE axles and two sets of GSL axles and they've probably all been swapped into the other at some point.

Which reminds me, I really need to stick new bearings on my other set of -SE axles.

Hmm, somewhere I traded a Series 3 disk rear for a Series 2 disk rear, bare housing. But I have no S2 axles, and the only diffs I have are one bare spool. Can't use the stuff, but don't want to pitch it either, you know?
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Old Dec 12, 2010 | 03:54 PM
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From: vermont
Originally Posted by peejay
The 81-83 and '84-85 diffs are the same except for the side gears, so if you're confident that you can pull a diff apart, you can disassemble them both and swap the late gears into the early case.

Or for that matter, if you're pulling it apart that far, you can do a cheap "regrip" and buy two friction plates. GSL-SE had only one friction plate per side, GSL had two (the -SE had an extra steel plate to make up the gap) so you can put a new friction plate in a GSL-SE to replace the extra steel and be good to go. Or do what I did and stick a .010" bearing shim underneath the end of the stack where it won't see any twisting loads. Two .010 basically made my worn out diff a spool, one brought the breakaway torque up to about 120ft-lb.

I have a few Series 3 disk rears, I don't know what started life as GSL and what was GSL-SE anymore. I have two sets of GSL-SE axles and two sets of GSL axles and they've probably all been swapped into the other at some point.

Which reminds me, I really need to stick new bearings on my other set of -SE axles.

Hmm, somewhere I traded a Series 3 disk rear for a Series 2 disk rear, bare housing. But I have no S2 axles, and the only diffs I have are one bare spool. Can't use the stuff, but don't want to pitch it either, you know?

thats alot of good info!
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