I finally bought a 4L80, with a yank 3600 and trans brake. Tired of rebuilding the 4L60. Does anyone have an idea of how much power the 4L80 will rob vs the 4L60? Haven't dynoed my truck yet but here's some times with the 4L60. Running a cam only 04 LS6 out of a ZO6. Truck weighs 4860 with me in it. Once the 4L80 is in adding spray, 150 shot. Any info will be greatly appreciated.

1.90 60'
5.37 330'
8.31 1/8 th
83.49 mph
10.67 1000'
96.53 mph

 

you should loose 50 hp.

 

I don't know how much power loss but the 80e seemed to pull better than the 60e on the top end.

 

50 HP and pick up 200lb of weight.

 

I did the swap and have NO regrets the 80e is a lil heavier and slower coming out of the hole but pulls like a bitch up top and hookin up isnt as bad as it used to be.

 

I agree. I have 80e in my s10. It for sure is sluggish at start, and wakes up at top end

 

I have the 4l80e the only thing i did notice was the sluggish 1st gear, but at the track with the 4l60 the best time was 11.56@117.? in cool weather, after adding the 4l80e with hotter weather best time has been 11.63@117.9. Maybe my yank converter is more efficient than my previous converter with the 4l60, but my shift extensions never drop below 6000 on the cluster with both 4l60 and 4l80.

 

damn 50hp seems like alot i was hoping for at the most 25 hp but im down to wiring up my 4l80e swap right now so cant turn back now.

 

I dynoed my stock suburban with the 4L80E and a 14 bolt rear end if that matters.

GM rates it 320 hp and 455 lbtq. I put down 238whp and 311wlbtq. Everyone said the torque is low because of "torque management". it made those torque numbers from 1600 rpms to 4800 rpms.

 

Installing the 4L80E tomorrow with a Yank PY3500 which is probably going to be a little tight for my truck, but it came with a trans brake and 150 shot is on the way.