1990Z71Swede
I'm Awesome
Did a testdrive the other day after some overdue maintainance, just to verify everything was fine. Which it was, well sort of, at least for now 
.
The transmission in the truck, a 4l60 without the E is showing some of its age I think. The 2-3 shift is taking a little bit longer than I would like, but IDK maybe that is normal-ish on these trucks with some miles on them? No flare or other obvious weirdneses and only does it when gunning it, part throttle shifts are distinct, but not hard.
The WOT shifting in the 2008 Suburban with 4L60E is a lot faster in comparison.
And since I have some plans for the motor, nothing extreme just some extra omph in the 280-290 hp range, I realize that this gearbox is not going to make it very long under those conditions.
So what is the smart way to go here?
I'm very tempted to go the EBL route for engine managment, that means swapping out the ECM
Would it be at all possible to go with an ECM that does Transmission control or do the "E" transmissions have their own TCM in the GMT400 to? Meaning I need both.
What I have in mind is going for a 4L80E, overkill I know, but built 4L60E's in Sweden are pricey.
I dont think the higher first gear is a problem the way we use the truck, my only concern is what impact the 4L80E has on milage, 1-2Mpg less is fine but more than that makes other options more interesting.
On the other end of the spectra is trying to build a TH700R/4L60 myself
Something I have never done, so that would be fun and interesting. The non E part of such a transmission is of course apealing as it makes for less things that can go wrong. And since I'm not doing anything crazy I guess I can get away with just a few upgrade parts like a Corvette servo and whatever else is needed for a little bit of extra durability. I'm well aware that such an endevor can be a disaster, but worst case, I'll just swollow my pride and take my parts to someone that knows what they are doing...
Maybe something in between the 4L80E and DIY-700R4 is way smarter? IDK...
.The transmission in the truck, a 4l60 without the E is showing some of its age I think. The 2-3 shift is taking a little bit longer than I would like, but IDK maybe that is normal-ish on these trucks with some miles on them? No flare or other obvious weirdneses and only does it when gunning it, part throttle shifts are distinct, but not hard.
The WOT shifting in the 2008 Suburban with 4L60E is a lot faster in comparison.
And since I have some plans for the motor, nothing extreme just some extra omph in the 280-290 hp range, I realize that this gearbox is not going to make it very long under those conditions.
So what is the smart way to go here?
I'm very tempted to go the EBL route for engine managment, that means swapping out the ECM
Would it be at all possible to go with an ECM that does Transmission control or do the "E" transmissions have their own TCM in the GMT400 to? Meaning I need both.
What I have in mind is going for a 4L80E, overkill I know, but built 4L60E's in Sweden are pricey.
I dont think the higher first gear is a problem the way we use the truck, my only concern is what impact the 4L80E has on milage, 1-2Mpg less is fine but more than that makes other options more interesting.
On the other end of the spectra is trying to build a TH700R/4L60 myself
Something I have never done, so that would be fun and interesting.
The non E part of such a transmission is of course apealing as it makes for less things that can go wrong. And since I'm not doing anything crazy I guess I can get away with just a few upgrade parts like a Corvette servo and whatever else is needed for a little bit of extra durability. I'm well aware that such an endevor can be a disaster, but worst case, I'll just swollow my pride and take my parts to someone that knows what they are doing...Maybe something in between the 4L80E and DIY-700R4 is way smarter? IDK...
Last edited:
