pl4yboy

iTrader: (1)

Little background:

The truck is a 2010 CCSB 4x4. 6.2, full bolt ons with a super loose Circle D 3400 multidisk. It has the 6l80 and 3.42 gears. Right now on a 125 shot, the truck is in the 12.5 range.

I've been spec'd one cam and wasn't pleased with it at all. It was a 222/230 .597/.601 112 on EPS lobes. A friend has a cam out of his 6.0 spec'd by Pat G (231 235 .617.620 113+2) and this is along the lines of what I was originally wanting for the truck. It's for sale, and I'm seriously debating buying it. I'm just afraid with the 3.42s I wont have enough gear. I'll be shifting around 6800 no matter what. Any comments are welcome.

pl4yboy

iTrader: (1)

Edit: Wrong section, mods feel free to move to internal.

hivoltagedriver

iTrader: (1)

I was running a similar (but larger) cam with my stock 3.46 gears in the Goat. Gears were never a problem for me, but it was a 6-spd car. The 6L80 has pretty steep gears in it compared to most autos, which will make up for some of your lack of gear ratio. I would think you would be OK with that cam for a while, it's still what I would consider a medium sized cam.

4.02, 2.36, 1.53, 1.15, 0.85, and 0.67:1 are the ratios in the 6L80. BTW, that moving for a CC 4x4!

Jim85IROC

iTrader: (6)

I'm no expert, but that sounds like a good cam for an LS3-headed vehicle. Not a lot of overlap, and good intake duration. Because of the deep 1st gear on the 6L80, the 3.42 gears should be a pretty good gear.

1lejohn

iTrader: (9)

I agree. How do you like the stall converter? It should help the truck get moving. Just wondering. I have a 6.0 CC 4x4 truck that I want to build up. 3.42's on a 4x4 sounds high. My truck has 4.10's .

pl4yboy

iTrader: (1)

I love the stall. It's extremely loose and flashes to 4k or so on the bottle. The 3.42s really aren't bad with the 6 speed. I'll be going with 4.10s when I can find someone close that I trust to do a gear swap.

1lejohn

iTrader: (9)

i'm surprised that the 3.42's came stock. Mines an HD I think they install the 4.10's for towing capacity. I'm thinking they do it on the 1500's for better gas mileage. Has the truck been tuned? Mines a dog with the stock tune the torque mangement is killing it. Oh well the truck has 120k and no problems so far.

pl4yboy

iTrader: (1)

Tuned by Casey Rance. Truck is running in the 12.5 range right now...

1lejohn

iTrader: (9)

Ok. I'm going to buy HP Tuners and try it myself, or have Flaco tune it. I need to learn how myself. Your truck is running good. I have an old N20 system from my car that I want to put on my truck. I'm thinking some new valve springs a mild cam , headers and a tune will help my truck a bunch. thinking a convertor after reading your post.

Jim85IROC

iTrader: (6)

Your HD has a 4L80E has a 2.48 first gear ratio. The 6L80E has a 4.02 first gear ratio. THAT's why the two trucks have different rear gears. The final drive ratio in first gear for your truck is a 10.2:1, where the final drive ratio for the half ton is 13.74:1, or close to 30% better than yours even though it's got "fuel mileage" gears. That's the beauty of a 6 speed transmission over a 4 speed. I'm too lazy to find the high gear ratios, but my guess is that the 1500 also has a more fuel-friendly final drive ratio in the highest overdrive than the 4th gear ratio of a 4L80/4.10 combo.

hivoltagedriver

iTrader: (1)

6l80E:
4.02, 2.36, 1.53, 1.15, .85, .67

4L80E:
2.48, 1.48, 1.00, .75

We definitly have a huge advantage with the 6L80.