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Toofah King Bad
 
Rasta Monsta's Avatar
 
Join Date: Oct 2006
Location: PacNW
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951 Axles

Questions about 951 axles:

1. The 86 951 used normal 944 "early offset" axles and CVs. True or false?
2. Later 951 used stronger CVs, and axles with a lower spline count. True or false?
3. "Stronger" 951 specific axles and CVs are not available for early offset cars, off the shelf. True or false?

If the above are all true, has anyone attempted to shorten a late offset axle shaft for use in an early offset car?

TIA,


rasta

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Old 02-17-2021, 12:59 PM
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Rasta, I think you are a bit messed up on axles, at least from what I understand.

The spline count is different for NA vs. Turbo axles. All Turbo axles are the same, early and late. That being said, I see a difference in part numbers for '86 compared to '87+. So I guess I am not sure.

There was a difference between axle lengths on NA cars with the steel vs. aluminum trailing arms, not between early and late, at least from my experience.

Maybe George has a more definitive answer...
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Old 02-17-2021, 07:34 PM
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From my notes about the length of half shafts:

87 944 21.5 Inches
86 944 21.5 Inches
86 944 Automatic Driver 22.5 Inches
86 944 Automatic Passenger 22.5 Inches

The halfshafts for cars with steel trailing arms were much shorter.

I believe that the 87 and newer turbo halfshafts were the same length, but had different number of splines.
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Old 02-18-2021, 02:54 AM
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Okay, that makes sense, although I have heard that the automatics have different length shafts from left to right.

Thanks George.

The 87+ have more splines than the 86 axles, I am pretty sure.

87+ axles can be used as-is on 86 cars.
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NASA/PCA Instructor: '88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
1987 944S - Restored salvage title, ready to live again
I can fix your late 944 Cruise Control module - PM for details

Last edited by kdjones2000; 02-18-2021 at 05:25 AM..
Old 02-18-2021, 05:21 AM
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turbo rear axles:
the 87+ have double the splines which is supposed to be stronger. you can use the 87+ in an earlier car although it's not recommended due to the valley/gaps created. you can use either spline/axle in either car as long as you also use the matching cv joints.

n/a vs. turbo:
the turbo axles are visibly thinner than n/a, but supposedly also stronger and lighter (german engineering magic?). rear axles are interchangeable between turbo/na as long as the matching cv joints are also used.

protip: keep an extra axle+cv joints as a spare so you can swap out the entire assembly instead of having to muck with trying to change just a cv joint/boot when they fail.

edit: now that i think about this some more, i'm not sure if the thinner/stronger axles were for all 951's or specifically for the 's' models. hmm.

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Last edited by nize; 02-22-2021 at 11:30 AM..
Old 02-19-2021, 06:51 AM
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