LBZ: Synthetic lube for transfer case

[Chevy1925]

i have ran 5w-30 full syn for the last 80k, only filled 2 quarts. i rebuilt my t-case about 25k ago due to the shift fork collar and wear fingers being worn out after 190k (common issues). inside was very clean. rear tail bushing is still tight, no seal leaks, chain has minimal stretch (best i can tell, no spec for the damn thing), planetary looks great, and i only replaced one bearing (rear output bearing had some notchyness to it i didnt like). Put 5w-30 back in, filled with 2 quarts and no issues since. checked this last summer and still looks new as far as oil look. still full too

 

[oscyjack]

thanks bud

 

[chrisuns]

Autotrak fluid here, but that's because I have a custom 246

If you check your fluid at a decent interval, I'd run a synthetic ATF or TC fluid. If not the motor oil won't harm anything - It MAY{(I haven't studied motor oil vs ATF effects on clutch material) and if anyone has, please feel free to educated me here} have a slight effect on the wear of the synchro clutch; however, unlikely you'll notice anything unless you're constantly switch from 2x4 to 4x4 24/7 on the go.

 

[OregonDMAX]

60k on my fluid looks as new as the day I put it in over 7 years ago 3qt Mobil 1 5w/30 synthetic.

I did have to add a quart a while back because like an idiot I left my truck in 4wd for 3 miles at well above highway speed and it came out the vent. But in all the time I've had it it's never done that and hasn't since.

 

[oscyjack]

ok cool. thanks all. just wanted to make sure i was on the same page. might try a switch of atf just to take note of any differences if any

 

[OregonDMAX]

Mine goes in and out of 4wd so quick and smooth with the 5-30 compared to ATF. That alone sold me on it.

 

[oscyjack]

WOrks for me. Just wanted to make sure I wasn't being an idiot and following along blindly

 

[N2BRK]

I ran 3qts without complaint, but George told me he recommends 2.5qts. I forget if it was noise or what... I'm half asleep, lol. Long damned day.

 

[oscyjack]

roger that. i have just under 2.5 so im no longer concerned :hug: