ILuvJDM's 2007 NBS RCSB Build - Turbo/4L80e/Coilovers/Wilwoods
#203
Decided to go ahead and tear down the axle I built last year. I only had a few thousand miles on it, but had a pretty bad whine to it as well as a decel noise. The backlash was still good at .006 but the pinion pre-load had loosened up to 10in-lbs.
Carrier bearings
Pinion bearings have weird marks on them. Any ideas?
Not sure if I should reuse the gears (4.11) or go with motive 3.90 or 4.10 since I've heard they are very quiet compared to Yukon
4L80 harness came in so I can integrate the extra harness before I complete the wire tuck
Also got a cheap can for the coolant overflow to hide inside the fender
Carrier bearings
Pinion bearings have weird marks on them. Any ideas?
Not sure if I should reuse the gears (4.11) or go with motive 3.90 or 4.10 since I've heard they are very quiet compared to Yukon
4L80 harness came in so I can integrate the extra harness before I complete the wire tuck
Also got a cheap can for the coolant overflow to hide inside the fender
#204
TECH Regular
iTrader: (3)
The pinion bearing preload being loose would lead to a whine and decel noise. The noise in the gears is all in the setup. Yukon gears are high quality, there shouldn't be a noise if properly set up.
An important thing to keep in mind is that a new pinion seal will add 2-3 in-lb of drag. So if you were barely in the lower end of the PBPL spec then that could be the culprit of it coming loose once the drag from the new seal was reduced after driving. I aim for the upper end of the spec to be safe. I would even be OK being 1 or 2 in-lb above with a new seal.
I would change the bearings since you're in there and they're marked. Looks like some debris might have gotten in there somehow. AxisT6 is our resident gear expert. He has a thread on how to set then up that I followed and how I know about the seal drag. He's super helpful!
An important thing to keep in mind is that a new pinion seal will add 2-3 in-lb of drag. So if you were barely in the lower end of the PBPL spec then that could be the culprit of it coming loose once the drag from the new seal was reduced after driving. I aim for the upper end of the spec to be safe. I would even be OK being 1 or 2 in-lb above with a new seal.
I would change the bearings since you're in there and they're marked. Looks like some debris might have gotten in there somehow. AxisT6 is our resident gear expert. He has a thread on how to set then up that I followed and how I know about the seal drag. He's super helpful!
#205
The pinion bearing preload being loose would lead to a whine and decel noise. The noise in the gears is all in the setup. Yukon gears are high quality, there shouldn't be a noise if properly set up.
An important thing to keep in mind is that a new pinion seal will add 2-3 in-lb of drag. So if you were barely in the lower end of the PBPL spec then that could be the culprit of it coming loose once the drag from the new seal was reduced after driving. I aim for the upper end of the spec to be safe. I would even be OK being 1 or 2 in-lb above with a new seal.
I would change the bearings since you're in there and they're marked. Looks like some debris might have gotten in there somehow. AxisT6 is our resident gear expert. He has a thread on how to set then up that I followed and how I know about the seal drag. He's super helpful!
An important thing to keep in mind is that a new pinion seal will add 2-3 in-lb of drag. So if you were barely in the lower end of the PBPL spec then that could be the culprit of it coming loose once the drag from the new seal was reduced after driving. I aim for the upper end of the spec to be safe. I would even be OK being 1 or 2 in-lb above with a new seal.
I would change the bearings since you're in there and they're marked. Looks like some debris might have gotten in there somehow. AxisT6 is our resident gear expert. He has a thread on how to set then up that I followed and how I know about the seal drag. He's super helpful!
#206
TECH Regular
iTrader: (3)
That might be a question better answered by Bryan, but they don't seem to be marked much from the previous setup. How do the teeth look? It was difficult to really get a good look. If they're not worn oddly you may be able to reuse them. I would give it a shot. Worst case you have to buy new gears, best case they work and you save yourself some dough to put into your fuel system.
#207
That might be a question better answered by Bryan, but they don't seem to be marked much from the previous setup. How do the teeth look? It was difficult to really get a good look. If they're not worn oddly you may be able to reuse them. I would give it a shot. Worst case you have to buy new gears, best case they work and you save yourself some dough to put into your fuel system.
#209
TECH Apprentice
iTrader: (22)
I always target 20-25 inch pounds of pbpl for new bearings and 10-15 inch pounds for used bearings. That said, pbpl is always going to loosen up some from break in on the new bearings, doesn't matter if you use a crush sleeve or a solid spacer.
The solid spacer is to stop pbpl issues caused by deflection of the crush sleeve due to high hp/drag launches etc. The spacer is a little more time consuming to set up on the front end but once it's set you're done and no more crush sleeve worries.
If you can catch a fingernail on the bearing marks, it'd be best to replace them. You can re-use the gear set but generally once they have been used and a wear pattern established, if they made noise they will continue to do so. However, yours don't really appear to be abnormally worn so you might be able to move them around and stop/lessen the noise. Only way to know is to try it though.
Btw, clean *** work and great build!
The solid spacer is to stop pbpl issues caused by deflection of the crush sleeve due to high hp/drag launches etc. The spacer is a little more time consuming to set up on the front end but once it's set you're done and no more crush sleeve worries.
If you can catch a fingernail on the bearing marks, it'd be best to replace them. You can re-use the gear set but generally once they have been used and a wear pattern established, if they made noise they will continue to do so. However, yours don't really appear to be abnormally worn so you might be able to move them around and stop/lessen the noise. Only way to know is to try it though.
Btw, clean *** work and great build!
#210
Launching!