Panther212
Registered Member
Re: HELP NEEDED: Something shifts after complete stop
that sounds like driveline slop... check your u joints and such.
that sounds like driveline slop... check your u joints and such.
CK5
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HELP NEEDED: Something shifts after complete stop (UPDATE)
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Burbinator
1/2 ton status
Re: HELP NEEDED: Something shifts after complete stop
Well, I am happy to report that I am the #2 success story in the "lube your shaft" saga.
It is amazing that something that is seemingly so minor makes such a big difference!
/forums/images/graemlins/burb.gif
Well, I am happy to report that I am the #2 success story in the "lube your shaft" saga.
It is amazing that something that is seemingly so minor makes such a big difference!
/forums/images/graemlins/burb.gif
Re: HELP NEEDED: Something shifts after complete stop
Same thing happened to me. Every time I started after being stopped...BANG. I thought the rear brakes were hanging up. But it was just the slip yoke. I found at the same time that my T-case fluid was low, which may have been part of the problem. When I pulled the shaft, almost no fluid came out. It's been months now and still no sign of the symptom returning.
Same thing happened to me. Every time I started after being stopped...BANG. I thought the rear brakes were hanging up. But it was just the slip yoke. I found at the same time that my T-case fluid was low, which may have been part of the problem. When I pulled the shaft, almost no fluid came out. It's been months now and still no sign of the symptom returning.
Re: HELP NEEDED: Something shifts after complete stop
Yes, the binding slip joint problem can manifest itself as a bang on takeoff. I've seen it most often on driveshafts that have the spline built into the shaft itself, rather than half on the driveshaft and half on the t-case.
As you take off, the pinion gear tries to climb the ring gear. This means that the shaft needs to get shorter, but if the splines are binding, the force must first overcome the bind. It does so with a bang and shakes the truck. Watch underneath (from the side!) /forums/images/graemlins/eek.gif as someone else drives off in your rig. It's easily visible when it happens.
Yes, the binding slip joint problem can manifest itself as a bang on takeoff. I've seen it most often on driveshafts that have the spline built into the shaft itself, rather than half on the driveshaft and half on the t-case.
As you take off, the pinion gear tries to climb the ring gear. This means that the shaft needs to get shorter, but if the splines are binding, the force must first overcome the bind. It does so with a bang and shakes the truck. Watch underneath (from the side!) /forums/images/graemlins/eek.gif as someone else drives off in your rig. It's easily visible when it happens.
RustBuket
1/2 ton status
Re: HELP NEEDED: Something shifts after complete stop
Moral of the story:
Lube your shaft regularily with Beaver oil.
Lesson learned!
Moral of the story:
Lube your shaft regularily with Beaver oil.
Lesson learned!
Re: HELP NEEDED: Something shifts after complete stop
I don't think it has as much to do with the rear pinion moving as it does with the forward lean of the vehicle as you come to a stop. Just letting off the brake pedal was enough to make the clunk happen. As you brake, the vehicle leans forward, which lengthens the shaft. At this point the driveshaft is backdriving the tranny and engine, so you have a little torque in the slip-yoke splines. But there is still torque in the splines when you're stopped because you are in gear, but not moving. Once you stop, the vehicle would normally settle back down to regular stance, but the sticking of the splines actually holds the back of the vehicle up. Once you let off the brake, that torque changes and the shaft sharts to rotate, breaking it loose and giving the clunk.
On my truck, the phenomenon would not happen at all if I would first put the tranny in nuetral before coming to a stop. When the clunk would happen, it didn't matter is you slowly let off the brake or just mashed the gas down, so I don't think axle-wrap was a factor in my case.
Yes, this is common behaviour for splines. Even steering shaft splines with a plastic to metal interface are lubricated for this very reason.
[ QUOTE ]
Watch...as someone else drives off in your rig.
[/ QUOTE ] You can bet I would call the cops right away.
I don't think it has as much to do with the rear pinion moving as it does with the forward lean of the vehicle as you come to a stop. Just letting off the brake pedal was enough to make the clunk happen. As you brake, the vehicle leans forward, which lengthens the shaft. At this point the driveshaft is backdriving the tranny and engine, so you have a little torque in the slip-yoke splines. But there is still torque in the splines when you're stopped because you are in gear, but not moving. Once you stop, the vehicle would normally settle back down to regular stance, but the sticking of the splines actually holds the back of the vehicle up. Once you let off the brake, that torque changes and the shaft sharts to rotate, breaking it loose and giving the clunk.
On my truck, the phenomenon would not happen at all if I would first put the tranny in nuetral before coming to a stop. When the clunk would happen, it didn't matter is you slowly let off the brake or just mashed the gas down, so I don't think axle-wrap was a factor in my case.
Yes, this is common behaviour for splines. Even steering shaft splines with a plastic to metal interface are lubricated for this very reason.
[ QUOTE ]
Watch...as someone else drives off in your rig.
[/ QUOTE ] You can bet I would call the cops right away.
