2007 H3 Alpha Conversion
#1
2007 H3 Alpha Conversion
Hello group. We are taking a 5.3L LY5 engine with all accessories, manifolds, harness, ecu, and transmission controller removed from a 2008 Chevy Tahoe and installing them in a 2007 3.7L Hummer H3. Here are both..
The transmission being used for this is a 4L60E built by RPM transmissions and has a loose converter. The 5.3L we rebuilt with a DOD delete and a BTR stage 2 truck cam. We are building our own harness for this and plan on using both the ECU from the H3 and the ECU/TCM from the Tahoe. We are pretty far along now, check out this short..
We have released a lot of content on this conversion and plan on releasing more at each step until it is complete. If you have an interest in converting your I5 H3 to a v8, come follow us on Youtube: Second Shift Performance - YouTube
The transmission being used for this is a 4L60E built by RPM transmissions and has a loose converter. The 5.3L we rebuilt with a DOD delete and a BTR stage 2 truck cam. We are building our own harness for this and plan on using both the ECU from the H3 and the ECU/TCM from the Tahoe. We are pretty far along now, check out this short..
We have released a lot of content on this conversion and plan on releasing more at each step until it is complete. If you have an interest in converting your I5 H3 to a v8, come follow us on Youtube: Second Shift Performance - YouTube
#3
Ya so as a part of the rebuild on the 5.3L we also changed the camshaft bearings before we put the stage 2 camshaft in. Here are the bearings that came out of the 5.3L with under 100k miles on the odometer..
These motors are hard on the camshaft bearings and also the valve guides are common to wear by 100k. But also the 4l60E GM transmission is absolute junk. A fresh build is always a nice way to go. And speaking of fresh build here are the big 3 pieces used for this effort. The built RPM Transmission 4l60E with Corvette servo and 2500 stall converter next to the rebuilt engine next to the cooling system upgrade..
These motors are hard on the camshaft bearings and also the valve guides are common to wear by 100k. But also the 4l60E GM transmission is absolute junk. A fresh build is always a nice way to go. And speaking of fresh build here are the big 3 pieces used for this effort. The built RPM Transmission 4l60E with Corvette servo and 2500 stall converter next to the rebuilt engine next to the cooling system upgrade..
#6
It can't possibly be any worse than the supercharged 6.2L powered H2 was. OMG @ 150f IAT the second you open the throttle.
I have a build thread on the Procharged LSX376-B8 powered 08 H2 here:
Lsx376-b8 + Procharger In A 2008 Hummer H2 | Supercharger Builds (superchargerforums.com)
I have a build thread on the Procharged LSX376-B8 powered 08 H2 here:
Lsx376-b8 + Procharger In A 2008 Hummer H2 | Supercharger Builds (superchargerforums.com)
#9
How much is this conversion costing the customer? I can’t imagine this is an affordable swap option, even with using a used engine like you guys did. Like previously mentioned, it would probably have been more cost effective to find a H3 with the V8 and do a rebuild or freshen it up if needed?
Or if they really like their H3, leave it with the 3.7 and go just buy a Tahoe if you need a SUV with a V8.
But it is interesting to see how you have chosen to go about this, and plan to run two different ECU’s in the same vehicle. Definitely different than the other ways I’ve seen & read about others doing this swap.
Or if they really like their H3, leave it with the 3.7 and go just buy a Tahoe if you need a SUV with a V8.
But it is interesting to see how you have chosen to go about this, and plan to run two different ECU’s in the same vehicle. Definitely different than the other ways I’ve seen & read about others doing this swap.
#10