So many options, Don't know what to do!!

[great white]

A properly built 4L60E can hold quite a bit of power. I like the ratios of the 4L60 more so too, longer overdrive and shorter 1st. They are lighter and rob less power too.

I stand by my original statement.....

 

[DGA1]

^^^Ha ha ha...fair enough.

 

[jeck11]

Would dropping in the 4l80 make my mileage go to crap?? I don't care much but I'd like to show this thing off as much as possible without getting absolutely railed at the pump haha

That OptiShift controller looks bada$$. Can it do all the tow/haul modes, paddle shift, and all that other stuff?

 

[ndians68]

don't think it would bother the mpgs, it would just help insure you for reliability when towing, or when just messing around

 

[great white]

4L60-E...3.06...1.62...1.00...0.70Light duty
4L80-E...2.48...1.48...1.00...0.75 Heavy duty

As you can see, the 80 is geared a little lower than the 60.

4l60e grew out of the 700r4. IOW, it's a car transmission.

4l80e grew out of the th400. IOW, it's a trick transmission.

80 is rated for ~110 lbft more torque.

80 is heavier and bigger than a 60.

Easy swap on a 2wd, bit more invoved on a 4wd.

Might cost you 1-2 mpg tops but it will outlast the truck.

My 80 has survived three 6.5 turbo diesels and has towed all it's life.

Sitting at 430,000 without a hint of failure or weakness.

You have to go up to the Allison's to find a stronger gm automatic....

Sent from my iPhone using Tapatalk

 

[great white]

Double post