The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - LS transmission questions and other Ls stuff.

**First c10** · 04-11-2019, 01:23 AM

My sons truck 70 lwb has a 2011 lc9 5.3 6l80 with 3.08 rear gear. It gets in the low 20’s I disabled the DOD/AFM in the tune. It has 30k on it since swap. It had 77k on it when I got it. With the 6l80 3.08 gears are great but you will need a posi.
Try and get it as a unit don’t peicemeal as it will be tough to get it to work together that way.
I am working on a mild cammed 4.8-4l65e. It was a 305hp before doing anything. I hope to get 20 mpg. They are cheap mine complete package was a 2008 delivered from Ohio with 83k for 2K$ lots of options out there just depends what you need.

Oh and if you go 4l60-80 you will want 3.42-3.73 rear gear as 3.08 maybe to high.

04-11-2019, 01:23 AM	#8
First c10 Registered User Join Date: Dec 2012 Location: Los Banos CA Posts: 2,706	Re: LS transmission questions and other Ls stuff. My sons truck 70 lwb has a 2011 lc9 5.3 6l80 with 3.08 rear gear. It gets in the low 20’s I disabled the DOD/AFM in the tune. It has 30k on it since swap. It had 77k on it when I got it. With the 6l80 3.08 gears are great but you will need a posi. Try and get it as a unit don’t peicemeal as it will be tough to get it to work together that way. I am working on a mild cammed 4.8-4l65e. It was a 305hp before doing anything. I hope to get 20 mpg. They are cheap mine complete package was a 2008 delivered from Ohio with 83k for 2K$ lots of options out there just depends what you need. Oh and if you go 4l60-80 you will want 3.42-3.73 rear gear as 3.08 maybe to high. __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!