6.2L with 6L80

Mogman

Registered User
Joined
Jan 28, 2022
Posts
3
Reaction score
0
Location
Papalote TX
Hello all, I have a Humvee that I installed a 6l80 behind the 6.2L and got to really give it a workout this weekend, I participated in the annual S. Padre Island beach cleanup.
We went 46mi down a FWD only beach and the sand was pretty soft for most of the 92 mile round trip run.
The 6L80 made a HUGE difference in its street-ability going from 2900 RPM with the TH400 @ 60 MPH to 1800 RPM and because the design is 50 years newer it is much more efficient as far as transferring power, the TH400 was a huge power sucking hole.
Anyway we dogged it real ******* the way down, high range and soft sand, doing around 35-40 at full throttle for about 30-35 miles while monitoring the trans on a laptop, the hottest we could get it was 205 deg, we sucked a ton of fuel!
On the way back we went into low range @ around 20-25 MPH and it was very happy at around 140 deg.
This truck weighs 7400lb + trailer and by the time we got back it was stacked very high with heavy wet sand laden trash! I wish I had taken more pictures.
I am real happy with the performance of the rather under powered 6.2L with the 6L80, I just recently picked up a GEP 6.5L center mount turbo engine with very low miles and believe it will be just the small amount of added power to make this rig really shine.
I installed a 6.6L LMM with the Allison 1000 in my other Humvee and that is a totally different animal!
You must be registered for see images attach
 

u2slow

bilge rat
Joined
May 8, 2007
Posts
1,817
Reaction score
814
Location
PNW
Agreed on the th400... it's amazing the difference of having lockup and enough gear spread. Even a clunky old 4spd manual was a huge improvement with my 6.2L.
 
Top