6L80 video for 1000+ hp

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j91z28d1

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You past guidance has changed the way I operate my 6L80 when towing heavy as well. I now run it in 4th @ 65mph on the highway all day long.

I'm curious, do you know the ratio on 4th?
 

Geotrash

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For negotiating grades, you want some underdrive. Mostly level grades and loads within the vehicle's limits, towing in 5th (an overdrive gear) is fine. Just my opinion and what I would do...
That's the main reason. We have lots of rolling hills here as we work our way up on, and back down from the Piedmont for the Appalachians. If I didn't keep it in 4th, I'd be up or downshifting every 20-30 seconds or so. If I'm on a long flat section where I know I can easily hold 5th at modest power, I'll click the range button up one gear.
 

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