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Which trans for 500rwhp?

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Old 08-09-2010, 11:08 AM
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i guess im the "lucky" few....i have a cammed 6.2 in front of my 53k mile 60e and im run 4:10s.
Truckshop, Skeet is running a performabuilt Level 2 (w.o converter is 1800ish, with comverter is 2600ish) i you was going to buy that FLT for 2800 plus shipping id look into a pb lvl 2 with a converter.
i was going to go 80e until you realize the 80e has a CRAP OD and me being on 4:10s id be at 2500+rpm at 70. right now im running 2200ish at 75 and still get 19mpg on the highway and 15ish in town.

i guess you can say im the guy thats not willing to swap in a 80e bc this is my DD/Family ride so i do need some kind of gas mileage.

decide what you want to do as far as HP then decide what money you have to spend on a tranny upgrade. i wish i would have waited to buy an 09 just for the 6spd. i would look into swapping the 6spd if you dont abuse your truck a lot and your not wanting to run a 4:10+ gear
Old 08-09-2010, 08:10 PM
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4l60e has a .67 and a 4l80e has a .75... not that big of a deal
6l80e has a .66
Old 08-09-2010, 08:11 PM
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id rather have a family truck i can depend on and cost me 1 more MPG.. haha
Old 08-09-2010, 08:16 PM
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Whats this going in, and 500hp to the wheels or crank?
Old 08-09-2010, 08:52 PM
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Its going in a 07 nnbs sierra crew and its 500hp (hopefully should be 475-515) to the wheels.
Old 08-09-2010, 08:57 PM
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Originally Posted by KA41
Its going in a 07 nnbs sierra crew and its 500hp (hopefully should be 475-515) to the wheels.
In this case go 4l80e for sure. Thats alot of weight and alot of power to the wheels.
Old 08-09-2010, 09:03 PM
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Do you know anyone that has done the 80e swap on the nnbs trucks?
Old 08-09-2010, 09:28 PM
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Just did a quick search and not much popped up. Apparently its not that common and difficult to do.
Old 08-09-2010, 09:33 PM
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Truckshop has 420rwhp, skeet has 480ish both on pb lvl2s.

i cant see myself swapping to an 80e bc i dont race my truck alot, nor do i abuse my truck. i dont go from OD to 2nd or 1st i pull it into gear vs makin it downshift.
Old 08-09-2010, 09:36 PM
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it shouldnt be much different, your still going from a 60e to an 80e....

going to need a custom crossmember, custom drive shaft, call speartech and they can make you a harness adapter or you can repin your plug, your going to need a 4l80e converter.. (tell them you want it to fit a 60e flex plate) or get a 80e flexplate and tell them you want it for that.... gonna have to find someone to do a 4l80e segment swap in your PCM and some custom cooler lines..

might as well throw a shift kit in tooo


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