Check that t-case fluid :0

N

N2BRK

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Dec 31, 2009
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I spent a couple nights helping my buddy prep his LBZ for a local truck pull event coming up on Saturday. While it was on the lift, I said we should change his transfer case fluid. The truck has over 300k and he bought it CHEAP about a year ago. I got the "well maybe we could top it off but it's not a priority". Wanna guess how wide his eyes got when I opened the drain and less than an eye-dropper full came out?!?!?!?!?! It now has 3Q of 5w/30 synthetic motor oil inside. Yipes!

We did the LML hydroboost unit too and this is the first time I've done it on an LBZ and the first time I ran into the problem of not being able to shift from park after. Rather than pull it out and drill the hole larger, we found a cool video describing how to bend the contacts in the brake switch instead. Voila. Easy peasy.

The rest of the budget short list to prep her was completed:

sleeves
DHD centerlink bracket
new poly torsion bar bushings and lowered fully
gear lube change
leaf spring clamps
rear suspension stops
new hitch
wheels and MT tires off another truck
front jounce bumpers
Lift Pump
LML hydroboost

With the leftover time we have before Saturday, we plan to:
swap in a lock box off an old truck
5" bed stack just for the event
Weld up mounts and toss on a borrowed weight box - only so he can look cool AF with his side biz logo on it :)

This should be fun as hell come Saturday, and it's always fun to wrench with friends.
 
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2004LB7

2004LB7

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I put 0W20 in my LMM. Was thinking it would be closer to ATF

When I purchased my LLY, I checked the T case fluid when I got it home and was pleasantly surprised it was full. I guess it should have been expected as the owner has the maintenance records going back to when he bought it new. Had 286,xxx miles on it

Still considering pulling it out to inspect the pump rub and maybe installing a kit. Doesn't currently leak so I wonder of it has been taken care of already. Didn't see anything in the paperwork for it though
 
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N2BRK

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My lb7’s was full and it has a new cover on; magnesium though :( I haven’t torn it open to see if the pump rub kit was done.

In my LMM I went to 5/30synth very early on and it was clean as a whistle inside!
 
malibu795

malibu795

misspeelleerr
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in the buckeye state
2004LB7 said:
I put 0W20 in my LMM. Was thinking it would be closer to ATF

When I purchased my LLY, I checked the T case fluid when I got it home and was pleasantly surprised it was full. I guess it should have been expected as the owner has the maintenance records going back to when he bought it new. Had 286,xxx miles on it

Still considering pulling it out to inspect the pump rub and maybe installing a kit. Doesn't currently leak so I wonder of it has been taken care of already. Didn't see anything in the paperwork for it though
Click to expand...
ATF is roughly 7 weight, hydraulic oil is 10 weight
Power steering is 3-4 weight
 
2004LB7

2004LB7

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Chevy1925

Chevy1925

don't know sh!t about IFS
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Where I see the vaporizing is high outside temps and towing in those temps. Tcase seems to vent a lot then but even still, not all of them have the issue.

The pumps inside these things are pretty rudimentary. I don’t think a thinner oil will hurt but figured I’d stick with what Mike stated.
 
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