I have a new nine inch 31 spline limited slip posi, that Is slipping like an automatic trans with low fluid. Here are some facts. It will pull the car barely. I did check the clutch it's ok 1 with the car in the air and in 1st gear (muncie 4 speed) one tire wont spin at all, but with my foot I can turn the other wheel. 2 in nuetral I spin one tire and both rotate the same direction. I did not try to stop either one yet. there is no noise coming from the rear gears Could the clutches have come apart to cause this trama. Any ideas.
The clutches keep it from letting you turn one wheel faster than the other. That part seems to be working? But if the car won't move, it's probably not the limited slip clutch. Do you have 31 spline axles? Are they both long enough to go into the differential the way?
Your differential has nothing to do with not moving the car. Assuming that the tires are not slipping, even a completely wasted limited slip will transfer power. All limited slip does is restrict the two sides from going different speeds. If your driveshaft is turning, the car had to go. Unless you are completely broken inside the differential. I think your problem is insufficient torque to turn the driveshaft. In other words, clutch slipping bad. Sent from dumb operator on a smart phone
It has the oil and additive. one axle is about 1/2 inch short, but it still goes into the splines about 1/2 inch. Both are 31 spline
btw if anyone is wondering why I suspected a short axle, it's because of how the Ford limited slip is built. Most others have the splines for the clutch on the outside of the side gear hub. But the Ford has a half thickness side gear, and the clutch hub has the rest of the thickness. They each have about half an inch of spline, and both must be engaged on the axle, for the differential to work properly.
Mr Squirrel is usually the man to ask when it comes to knowing all the little things that trip people up . He is one of the more helpful guys here,,,,always on point and always trying to help . His name is Jim,,,,,he always makes me think of Mission Impossible . This tape will self destruct in 5 seconds,,,,,Good Luck Jim ! Lol,,,,sorry I couldn’t resist,,,,,but,,all the rest is true . Tommy
I built a 55 Chevy for a guy that had an Art Morrison chassis. The day I got it running, I put it in gear and tried to drive up my driveway. As soon as I hit an incline, the car stopped. At first, I thought it was the transmission, but I looked underneath, and the driveshaft was turning. We called Morrison and they said to pull the axles and check the length. One axle had been shortened 1/2 inch by the shop that assembled the chassis. Fortunately the shop stepped up and paid for the new axle. The correct length axle had to be wiggled, almost like a torque converter, to get the splines in. Dave
You'll have a bear of a time getting the new axle in if the clutch hub and spider gear splines are no longer aligned, especially if it's a new center with decent clutches and good preload.
This site is so lucky to have Squirrel as a member. He never ceases to amaze with his fast responses and knowledge. Thanks Jim.
If aliening steel plates to friction plates is a problem here's what I have done to make it a little easier. Take an appropriate splined junk axle and bull nose the end of the axle splines (hand grinder, belt sander), hand file splines clean. If you need it longer just cut off a 2 or 3 inch stub off the splines and weld to a long solid shaft to bang on..................
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