4l80 swap
Aug 19, 2018 | 09:00 AM
#11
Teching In
Joined: Jul 2018
Posts: 12
Likes: 1
From: Missouri City
Sorry, my truck is a 2wd. When the 4l60 was pulled out and set next to 4l80 they seem the same length but 4l80 mount was back more by 6 1/2 inches or so. For sake of time and money we just mounted cross member on back flanges versus in between and weld a 1 inch angle plate for mount. I eventually picked up a custom tube mount at a Fab shop for $160, seems it's a popular item. I think cross member same on 2500 but mounting tabs are further back but could be wrong as I never looked at a suburban.
Also bought lower flywheel dust cover from express van to cover convertor from salvage $75.
Also bought lower flywheel dust cover from express van to cover convertor from salvage $75.
Aug 27, 2018 | 12:14 PM
#12
TECH Enthusiast
Joined: Dec 2004
Posts: 599
Likes: 60
From: fort campbell
how is the 4l80s first gear (2.48) compare to the 3.06 from the 4l60? I have an 08 Sierra crew 2wd with the 3rd 60 in it but don’t want to loose first gear fun time
I have a stock stall 3.73 gear BTR truck2 cam
tsp 1 3/4 long tube and y to stock tail pipe w hooker maxflow muffler swap airaid mit Weeks street tune
thanks
I have a stock stall 3.73 gear BTR truck2 cam
tsp 1 3/4 long tube and y to stock tail pipe w hooker maxflow muffler swap airaid mit Weeks street tune
thanks
Aug 27, 2018 | 01:07 PM
#13
Teching In
Joined: Jul 2018
Posts: 12
Likes: 1
From: Missouri City
I was told by many swapping to 4l80 my horsepower would drop because of weight and gears. Honestly my #s jumped up because trans didn't slip and 1st gear imo is very quick. I have to control gas pedal or it will break traction every time, definitely a lot more fun and I'm confident it would grenade like the 60 and 70 I had in it before.
Aug 27, 2018 | 01:12 PM
#14
TECH Addict
iTrader: (7)
Joined: Feb 2013
Posts: 2,985
Likes: 372
From: Somewhere north of 285, south of 985.
When I did my swap, I had 4.56s. That suuuucked on the interstate.
I ended up having them swapped to 3.90s and imo, it's perfect. I cruise at 80 and about 2800rpms or so. With the 4.56s, it was closer to 3500rpms.
I ended up having them swapped to 3.90s and imo, it's perfect. I cruise at 80 and about 2800rpms or so. With the 4.56s, it was closer to 3500rpms.
Sep 4, 2018 | 03:21 PM
#20
bahahaha
this question is old as time. Here is a quick run down, but this has literally been covered on every corner of the internet:
-You need the cross member mod plates (requires welding), or a vendor's cross member
-Shorter rear shaft, longer shaft
-You can get 30 spline inputs for your case, no problem, but your case is not a direct swap
-4L80 converter or a circle d conversion converter
-Segment swap with harness repin
-Bolts line up, bell housing and t case
-Gear swap not necessary
-Cooling lines differ, easy to modify
-gear selector is the same
-need a 4l80 dipstick tube
-dipsticks are the same 60-80
this question is old as time. Here is a quick run down, but this has literally been covered on every corner of the internet:
-You need the cross member mod plates (requires welding), or a vendor's cross member
-Shorter rear shaft, longer shaft
-You can get 30 spline inputs for your case, no problem, but your case is not a direct swap
-4L80 converter or a circle d conversion converter
-Segment swap with harness repin
-Bolts line up, bell housing and t case
-Gear swap not necessary
-Cooling lines differ, easy to modify
-gear selector is the same
-need a 4l80 dipstick tube
-dipsticks are the same 60-80
