rjm60
I'm NEW... What now?
Chevy 2004 Suburban LT 2500, 4WD, 6.0 L Engine, 4L80 Transmission, NVG-246 Transfer case (2 speed with Auto mode)
Really loud noise in 4WD - Nothing or barely noticeable in 2WD - Initially lower in 4LO but now about the same as in 4HI.
Will be rebuilding 2/12 thru 2/14. Collecting special tools, parts, supplies.
I bought a BK-351 rebuild kit for this transfer case and it is the one that has 3 identical needle bearings, about 2 inch OD and about 1 inch wide but there's another kit (same number) that has just one of these and instead of the other 2, what looks like the same OD needle bearing but twice as wide with 2 rows of needle rollers.
The front output shaft uses one short needle bearings for the rear support and it seems the other 2, or the double wide one, go into the clutch housing to support the clutch hub (see pics).
Scouring the internet, I found pictures that only show the dbl wide bearing but there are also exploded diagrams that show 2 of the same bearing going here; however, when checking the PN for these bearings, the clutch housing and front output shaft bearings always have different PN's.
My guess is that the 2 separate bearings was for an early version of this transfer case but now the single, double row bearing is used. Also, more than likely, the PN info was updated but the diagrams were not, so they still show 2 bearings for the clutch housing. This is somewhat backed up by service bulletin 05-04-21-005 which states:
If service requires replacement of the first design Clutch Hub (17) that is no longer available form GMSPO ,the second design Clutch Hub (17) requires a second design Apply Plate (18) also be replaced in order to obtain proper stack up height in the transfer case.
Does anyone have any detailed info about this?
Could the bearing update also be part of this change?
Could I use either the 2 separate bearings, or do I need to use the same bearing that's already I there (assuming clutch hub will not be changed).
I appreciate any info on this as I couldn't find anything via google. Also, I already have the 3 piece Kent-Moore clutch pack height measurement tool (will rent out cheaply to anyone in Los Angeles Area
- also have the saccitycorvette rear cover centering tool if anyone nearby needs to "borrow" it. Works on the 5.7 and 6 liter engines - google it).
Thanks in advance
P.S. Joined a bunch of forums that want money to be able to post pictures. I really appreciate this forum for not needing to do the same.
Really loud noise in 4WD - Nothing or barely noticeable in 2WD - Initially lower in 4LO but now about the same as in 4HI.
Will be rebuilding 2/12 thru 2/14. Collecting special tools, parts, supplies.
I bought a BK-351 rebuild kit for this transfer case and it is the one that has 3 identical needle bearings, about 2 inch OD and about 1 inch wide but there's another kit (same number) that has just one of these and instead of the other 2, what looks like the same OD needle bearing but twice as wide with 2 rows of needle rollers.
The front output shaft uses one short needle bearings for the rear support and it seems the other 2, or the double wide one, go into the clutch housing to support the clutch hub (see pics).
Scouring the internet, I found pictures that only show the dbl wide bearing but there are also exploded diagrams that show 2 of the same bearing going here; however, when checking the PN for these bearings, the clutch housing and front output shaft bearings always have different PN's.
My guess is that the 2 separate bearings was for an early version of this transfer case but now the single, double row bearing is used. Also, more than likely, the PN info was updated but the diagrams were not, so they still show 2 bearings for the clutch housing. This is somewhat backed up by service bulletin 05-04-21-005 which states:
If service requires replacement of the first design Clutch Hub (17) that is no longer available form GMSPO ,the second design Clutch Hub (17) requires a second design Apply Plate (18) also be replaced in order to obtain proper stack up height in the transfer case.
Does anyone have any detailed info about this?
Could the bearing update also be part of this change?
Could I use either the 2 separate bearings, or do I need to use the same bearing that's already I there (assuming clutch hub will not be changed).
I appreciate any info on this as I couldn't find anything via google. Also, I already have the 3 piece Kent-Moore clutch pack height measurement tool (will rent out cheaply to anyone in Los Angeles Area
- also have the saccitycorvette rear cover centering tool if anyone nearby needs to "borrow" it. Works on the 5.7 and 6 liter engines - google it).Thanks in advance
P.S. Joined a bunch of forums that want money to be able to post pictures. I really appreciate this forum for not needing to do the same.
