New Truck, 8LL Trans

That little blue (usually) switch is for deep reduction. If your in an off-road/muddy situation or you just need alot of pulling power you shift into neutral, engage the switch, than shift into the gear of choice (generally Lo-Lo). When done you disengage the switch, shift into neutral than back into the gear you were previously in (deep reduc. LoLo-Neu.-LoLo) than resume normal up-shifting. Or if you can stop just disengage deep reduction and choose whichever gear you desire to start in. I suck at explaining things but that about sums it up.

 

Hey RacerX-here is link to Eaton /roadranger. Has all info on 8LL-9LL and all others. Video on shifting. Tech data, etc.
http://www.roadranger.com/Roadranger/productssolutions/transmissions/8lltransmissions/index.htm

 

It's a good tranny, but you only have 8 gears to choose from on the road. It will prolly be a little slow on the road and have a little bigger jump between the gears but as long as you are not trying to go 75 mph it should be fine. Personally I don't see a need for the 8LL, 1st gear in my 18spd is slower than LL in the 8LL

 

Another newbie for 8ll
I was told that you can/have to shift all the other 4 gears when you are in deep reduction.
Whereas the eaton fuller manual on how to shift the tranny says you have to shift from LL to L and then the 8 following gears.
???

 

if i remember right you can shift the first 3 gears in ll. the range button won't move while in deep reduction. when you go to neutral and flip the blue side button back to L, then you can shift the rest of the gears and the range button will flip up and down again.