Topic: Transfer case bearing

[GRM]

My truck used to make a slight bearing noise, but it went away. After the 4.7 gears, it is very noticable, expecally when bogging the motor in 3rd or 4th gear (35 mph in 4th gear for example). I have a very strong feeling it is the large bearing in the center of the transfer case. Now, when I had the case apart, that bearing looked good, but I know it is the one making noise. When should I really start to worry about the problem?
I bought a spare transfer case, mainly for that bearing. When I fix the problem, should I swap the 4.7's into the new case, or put that bearing into the old case? The new case came out of a very beat up 84 with 120k on it, that had tranny bearing noise, so the entire tranny and tc were swaped.

FYI, I have a 89+ w56 and topshift case in my 85 currently out of an unknown truck.

Thanks for the help.

[ezthere]

Buy a brand new bearing dude.


Say I am going to install the same granny gears. 35mph in 4th gear. What kind of rpm are you pulling..?

[GRM [OP]]

shoot, what RPM, I dont have a tach, but my math says about 1400 RPM. (assuming 4th gear is 1:1)

[Marlin]

The large center bearing is a 6308N bearing, and has a very good service record. I doubt this is your problem.
Do you only have this noise in the coast or float position? Have you checked your rear driveshaft angle? How about your motor mounts? Is the drivers side mount cracked or broken?
Time to do some home work...

Marlin