I’m not touching auto transmission or the transfer case. 4Lo has been out for awhile in the transfer case. Don’t you have to replace bearings? Plan is just to get a reman exchange transfer case from the same place doing the transmission.
Not doing it yourself is one choice. Having a different one rebuilt and replacing your is another.
Not diy is always a personal choice and because you are having problems with yours and doing it at same time as transmission makes sense because you have ZERO labor cost for changing the t-case.
Just like r&r transmission for one on the shelf that is a rebuild- if the transmission shop is 100% on point and gets the EXACT same one -great. But I have seen the confusion and complaints when they get one in to replace it that has a slight difference.
So my suggestion is sharpie your initials on it somewhere. then the very day you get it back- go work it hard. 4 hi& low, 2 high and low. Spin tires in turn- think donuts in the dirt all 4 tires spinning. Then hard as possible slow speed turns in 4wd high and low like slalom course with excellent traction.
Your old t-case will sit in their shop a few days before it goes away at most. If there is a problem and they need to reference your old one you want it to be done right away.
When t-case gets done wrong, it usually fails first or second time working hard. So you are better to have it go back right away rather than you don’t work it hard until the end of the warranty. A chain driven rebuilt unit is not a brand new factory build. Only something that seriously broke along with the chain and pads I mentioned earlier are going to be new. The rest will be gears that have 200,000 mile on them from the last shmuck that beat it. So don’t think you are using up some of the good lifespan by doing that on day one.
Idk about the affects on a fresh built transmission and doing that day 1 vs wanting to get every last mile out of it. I do know on brand new trucks with 4l80e behind 6.5 and gassers in the fleet- All those trucks but a couple got beat hard from day 1 and even the ones that we did abuse testing on that never got a single filter/fluid change- they all crushed the 200,000 mile mark. We did many with a fluid change at 60,000 mile intervals and they faired about as well as ones that got it at 30,000. They all went to the 300,000 mile area.
I don’t know of any 4l80e that was worked a little bit here and there and made it to 400,000. So unless
@THEFERMANATOR has objection to doing that to the fresh rebuilt transmission and recommends some kind of break in period- thats best recommend I can give.
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