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Has anyone come across this and what happened if you did? 2012 Tahoe cr258235 right front axle housing catalog lists 1st design 15270854 (has single flange seal 3 and 3/4") and 2nd design 22942970 (has duel seal flange 2 and 3/4") but the only seal listed is 22761722 which is about 2 and 1/2" diameter. if they are different how can there be only 1 seal listed.

On the same vehicle, the axle shafts are also first and second design...but they give you a casting number to look for to differentiate between designs. I would find the casting number from the axle notes and apply it to the housing.

1 15801499 06.055 R SHAFT, FRT DRV AXLE INR (USED ON VEHICLES W/DIFF HSG W/CSTG # 40025083 ON THE DRIVER SIDE CASE HALF) (FOR 2ND DES SEE 22761721) K1 (GU6,NQG,NQH) (1ST DES) 2012 - 2012 01 3A 2 X0138

1 22761721 06.055 R SHAFT, FRT DRV AXLE INR (USED ON VEHICLES W/DIFF HSG W/CSTG # 40089885 ON THE DRIVER SIDE CASE HALF) (FOR 1ST DES SEE 15801499) K1 (GU6,NQG,NQH) (2ND DES) 2012 - 2012 01 3A 2 X0138

Thanks Scott I did see that, my concern is how can they both take the same seal, bearing and gasket and be different, based on casting # I have 2nd design which is source and doesn't show to be available the 1st design is in my local pdc.