8.75 SureGrip , Is this Normal?
I'm not sure why the pinion is stiff, I don't think it would be foreign matter, but as I said, now with oil all around it, it is a little easier. However it still behaves like an open centre. And no, with it out of the car and no axles, it was still super tight to turn. With both axles bolted in, and turning one axle, the other wheel turns opposite (like an open, non-LSD centre) and the yoke does not turn. (unlike the BorgWarner LSD in my Valiant, the yoke will turn when you turn one wheel). Also, when another person turns the pinion, either axle can be stopped with one finger pressure! I did an experiment -see pictures. I have another 8.75 (489 case) with a Sure-Grip -but this one is the BorgWarner cone style whereas the faulty 741 is a clutch, Dana style type. I know that one is good. I stuck axles into it on the ground and did the same checks -totally different ! The yoke is easy to turn with two finders. Turning one axle will turn the other axle the same way, and when the pinion is turned, the axles are locked into gear, they cannot be stopped with force.
So it has to come out. My guess is that the clutches are fried, non operational, and that the guy I bought it from (who also did the carrier bearings) may have known this, I think he tightened the preload too much. And here in Australia, these 8.75 centres are not easy to find. Hardly ever see them for sale and to fix this one with a new LSD unit (eg Auburn Gear or Nitro posi) with the install kit and shipping etc is about A$1400-$1600.
I'm not sure why the pinion is stiff, I don't think it would be foreign matter, but as I said, now with oil all around it, it is a little easier. However it still behaves like an open centre. And no, with it out of the car and no axles, it was still super tight to turn. With both axles bolted in, and turning one axle, the other wheel turns opposite (like an open, non-LSD centre) and the yoke does not turn. (unlike the BorgWarner LSD in my Valiant, the yoke will turn when you turn one wheel). Also, when another person turns the pinion, either axle can be stopped with one finger pressure! I did an experiment -see pictures. I have another 8.75 (489 case) with a Sure-Grip -but this one is the BorgWarner cone style whereas the faulty 741 is a clutch, Dana style type. I know that one is good. I stuck axles into it on the ground and did the same checks -totally different ! The yoke is easy to turn with two finders. Turning one axle will turn the other axle the same way, and when the pinion is turned, the axles are locked into gear, they cannot be stopped with force.
So it has to come out. My guess is that the clutches are fried, non operational, and that the guy I bought it from (who also did the carrier bearings) may have known this, I think he tightened the preload too much. And here in Australia, these 8.75 centres are not easy to find. Hardly ever see them for sale and to fix this one with a new LSD unit (eg Auburn Gear or Nitro posi) with the install kit and shipping etc is about A$1400-$1600.
