• Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!

  • Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.

Using 4l80 in Humvee with LS?

sail78385

Member
68
80
13
Location
Charleston SC
Ive exhausted my keyboard trying to figure this out. Can the factory 4l80 in my Humvee be used with a LS engine, such as a Lq9? Anyone gone this route and used a Holley setup with the gauge pack/screen from Holley? If this is even possible is the stock humvee torque converter ok or does it need to be swapped?
 

TOBASH

Father, Surgeon, Cantankerous Grouch
Steel Soldiers Supporter
Supporting Vendor
3,590
3,508
113
Location
Brooklyn, NY
Your HMMWV torque converter will probably have the wrong stall speed.
 

Mogman

Moderator
Staff member
Moderator
Steel Soldiers Supporter
6,991
9,668
113
Location
Papalote, TX
They make adapters to be able to use the legacy transmissions on the LS motors, the crank to rear engine flange depth is different, and as TOBASH said you should use a gasser torque converter.
The info is not hard to find.
.
 

Mogman

Moderator
Staff member
Moderator
Steel Soldiers Supporter
6,991
9,668
113
Location
Papalote, TX
I had to do the reverse when I installed a 6L80 behind the Detroit engine, I had to use a spacer between the bell housing and engine rather than a spacer between the torque converter and crank.
 

Mogman

Moderator
Staff member
Moderator
Steel Soldiers Supporter
6,991
9,668
113
Location
Papalote, TX
Here is a link with some visual explanations, IIRC you will need a conversion flex plate and a crank extension, the crank extension gets the 4L80 torque converter correctly spaced into the transmission.
 

Mogman

Moderator
Staff member
Moderator
Steel Soldiers Supporter
6,991
9,668
113
Location
Papalote, TX

TOBASH

Father, Surgeon, Cantankerous Grouch
Steel Soldiers Supporter
Supporting Vendor
3,590
3,508
113
Location
Brooklyn, NY
Perhaps I posted the incorrect thread…. Plenty of people go gasser.
 

TOBASH

Father, Surgeon, Cantankerous Grouch
Steel Soldiers Supporter
Supporting Vendor
3,590
3,508
113
Location
Brooklyn, NY
Some of the original H1 were built with Chevy engines. They are called gassers. Many people throw in Chevy engines. Discussed here and that other forum.
 
33
19
8
Location
BOSTON,MA
I am doing a lq9 with a 4l80. I was going to throw away stock tranny and converter a 4l80 should bolt right up. The lines are different. I will tackle that when i get to it. I guess rear diff has a coolant line through the trans??? I was going to delete.
 

Mogman

Moderator
Staff member
Moderator
Steel Soldiers Supporter
6,991
9,668
113
Location
Papalote, TX
I am doing a lq9 with a 4l80. I was going to throw away stock tranny and converter a 4l80 should bolt right up. The lines are different. I will tackle that when i get to it. I guess rear diff has a coolant line through the trans??? I was going to delete.
You do not need the coolers, diff or transfer case unless you plan on going under extremely heavy load in low range in something like sand for a long period of time.
Yes just about any 4WD 4l80 should bolt up, I was not aware of any cooler line differences, if your original trans is good, I would go ahead and use it as they are built heavy duty.
 
33
19
8
Location
BOSTON,MA
You do not need the coolers, diff or transfer case unless you plan on going under extremely heavy load in low range in something like sand for a long period of time.
Yes just about any 4WD 4l80 should bolt up, I was not aware of any cooler line differences, if your original trans is good, I would go ahead and use it as they are built heavy duty.
I plan on deleting all of it. Just complications and leaks. I am just driving around town and light offroad.
 

TOBASH

Father, Surgeon, Cantankerous Grouch
Steel Soldiers Supporter
Supporting Vendor
3,590
3,508
113
Location
Brooklyn, NY
HummerH1 deleted all the xfer case cooling and he has almost 300,000 miles.

He also has M998 so no diff cooling.
 
33
19
8
Location
BOSTON,MA
Would love to see progress photos!

i started a thread. I have everything but the truck. EUC massive delays for me april till current waiting.
 

sail78385

Member
68
80
13
Location
Charleston SC

i started a thread. I have everything but the truck. EUC massive delays for me april till current waiting.
nice! I won my truck a few weeks ago, engine I’m assuming is toast so just trying to figure out the best course of action. I’ve really been considering 6.6 and 6L90, but idk. Might be easier to just put a LQ9 / LQ4 in it and move on….
 
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks