Duramax engine swap

[Sparo2]

Good morning everyone. I’m about to start on a Duramax engine swap. I just purchased an LLY with a Allison trans/transfer case. The first thing I wanna do is get the engine installed. My question is… Cant I just use the motor/trans mounting hardware from a Hummer H1 duramax? It should be the same right? I know H-line conversions sells a mounting kit for $1300 But if I can find a cheaper solution then all the better.

Does anyone know the differences in Mountain hardware between the hummer H1 Duramax and the hummer H1 6.5?

 

[diluted]

I think you need to body lift?

 

[JoeJrTheBarber]

I think you need to body lift?

I believe a 2" body lift is needed / was added to the Alphas when they went Duramax..

 

[Sparo2]

Yes I know about the body lift being needed to clear the Duramax. What I wanna know is what is the difference in the mounting hardware other than the motor mounts. Is the crossmember different?

 

[bronco74]

Check Tinman products and performance for mounts- Summit Racing has them

 

[dilvoy]

The alphas had a special low profile oil pan and pick up for the engne as well as a specialally positioned inlet for the water pump amng other differences.

 

[FirstGen FBody]

im looking into doing a Duramax swap also. This is what i have found out so far new motor mounts, new transfer case crossmember, 2.5 inch body lift, longer fuel tank straps, trans and transfercase linkages, lower steering shaft boot needs to be lowered and then wiring. there is an play list of a hmmwv Duramax swap on youtube, look up johnny magic hummer
Please make a build thread!!!

 

[Skrilex]

Don’t you also need drivelines lengthened, and shortened?

 

[FirstGen FBody]

yes, drive shafts also. forgot that one, thanks

 

[Sparo2]

Thanks everyone for your input.
I think I’m going to go with the Timmans kit. The thing about the special oil pan...I didn’t know that.
I’m going to document the entire build process and once it’s done I’ll post it. It’s going to take some times because I work real long hours and I hardly have time to work on it.

 

[Sparo2]

Quick update: 8/23/2018
I removed the old engine/trans/TC.
I just bought a 2005 Duramax with a 5spd Allison trans and TC.

I putting aside all the parts that I’m going to be selling; radiator, smart start, both driveshafts, trans, 242NP TC, etc etc.

I’m currently making a list of all the parts I’m going to need. I’m also considering rebuilding the engine...just for added insurance.

Im trying to document everything as best as I can with video and notes.

PS: if anyone is interested in some of the old parts just send me
a PM.

 

[Sparo2]

Quick question guys...
I was thinking of reusing the original radiator. I know H-line conversions uses a replacement radiator but it looks similar in size. Is it just because to put in a aluminum version? I was also thinking of reusing the original trans cooler. What are your thoughts on this?

 

[Action]

Quick question guys...
I was thinking of reusing the original radiator. I know H-line conversions uses a replacement radiator but it looks similar in size. Is it just because to put in a aluminum version? I was also thinking of reusing the original trans cooler. What are your thoughts on this?

Did you calll h-line and ask ?

 

[Sparo2]

Did you calll h-line and ask ?

No I have not. I have never dealt with them but I would figure they would tell me whatever they had to to try and sell me their product. I was hoping I could get some input from someone who has already been down this road.

Update: The original radiator can be used

 

[patracy]

Are you upgrading the gearboxs, half shafts, and diffs?

 

[ken]

The rad struggles to cool a 6.5. A duramax would overwhelm it easy. Although H-line is about the same size, you can bet it has more fins per inch. Also being Alium it will transfer heat far better.

 

[Sparo2]

I think I’m going to give the OEM radiator a shot and see how well it does. I can always swap it out later

As as for the drivetrain upgrades... I will be updating the shafts to the 12.3K versions. As for the diffs I am going to leave them in place to see how much they can handle.

 

[KenaAuto]

In AZ, the factory set up runs hot in the hills. I've been trying to convince my doctor to convert his to an aluminum version so he can enjoy it more...of course, this is a civy H1, turboed.

Sent from my Pixel using Tapatalk

 

[Action]

You could switch to a geared fan drive...

 

[Sparo2]

I remember reading somewhere that someone had used two pusher fans in conjunction with the OEM set up and it worked great. I was thinking of trying that.