I am attempting to post my first post in a forum (have never tried before). I am in the middle of a swap on my 98 Hummer H1. I have done a lot of research online on this swap and I have found very little info. This has lead me to attempt this thread. Any advice anyone wants to give me is welcomed. I will be posting pics and info as I learn how.

I am currently at the point where motor is mounted in vehicle and working out the details. Motor/tranny (8.1/4L85E) came out of a 2005 Avalanche 2500 4x4. 50,000 miles. I was able to take anything I wanted out of vehicle so grabbed all that I thought that I might need. Plan to post all that was useful or not.

 

Ok. My first attempt at posting pic.

 

Easy part....

 

Another pic...

 

L18 8.1L swap resource thread - CK5 Forums
This thread has been one of my biggest assets in swap so far. Larry at coloradok5 is a huge library of knowledge. This and a handful of extremely smart friends the project is moving along nicely.

 

Interesting. What mods are you having to make for it to fit?

 

Did 2 inch body lift to give extra clearance under windshield. Used factory motor mounts which kept trans/tcase in factory location. Switched front end of motor to a GM topkick configuration. So far so good. Need to call Howell to see if they will build me a complete wiring harness...

 

Not bad. You have oil pan clearance, etc all figured out by now. First swap of an 8.1 into an H1 that I have heard of.

 

AMG did 3 vortech 8100 from factory. (Supposedly Arnold Swartz got one of them). I had tried to locate info online with no luck. The above thread from coloradok5 was the biggest help I could find online. As far as I know we had zero oilpan issues using factory oilpan. The is no way that Avalanche accessory configuration would have worked (unless you just deleted AC compressor.

 

Pic of factory vortec 8100 H1