Anyone Running An 8ll Tranny?

[diesel]

I have been using this 92 CH613 with a 22 ft aluminum grain box for a few weeks. I have been around my 13 speed in my 377 Pete for 8 years. It seems to me that theMack's high side gears in the 8LL tranny is a little long legged. The engine is an E7 and I recently installed a Blixxton and put the toggle to the 30% position. I am getting around 21 # of boost when the truck is loaded weighing around 58-60,000 lbs. Is this the nature of the 8LL trannys? Thanks.

[Maxville Truck]

That transmission is meant to be shifted as a "5 speed" the low range is really only for putting around in the field (in your application) or jobsite use as a cement or dump truck. One thing that may help you if you have a low rpm engine...... have your local mack dealer set the top rpm to 2100. it will shift a little easier, your engine is designed to have the torque to pull from the lower rpms, a little tough to get used to i understand..

[Noid93]

What transmission do you have, A mack or an eaton fuller... Beacause an eaton fuller 8LL is to be shifted as an eight speed(similar to your pete). But a mack 2060,70,80 can be ran like a five.. The eaton fuller 8LL trans should like low rpm better...

[diesel]

The tranny is the Eaton Fuller 8LL tranny. Shifting thru the low side is easy. Getting thru the high side is a little more challenging than the high side of the 13 speed in the Pete. It seems like the gears are a wide ratio between gears. I don't suppose I can add on the ability to split the gears on the high side, like the Pete?

[bts-4120]

The tranny is the Eaton Fuller 8LL tranny. Shifting thru the low side is easy. Getting thru the high side is a little more challenging than the high side of the 13 speed in the Pete. It seems like the gears are a wide ratio between gears. I don't suppose I can add on the ability to split the gears on the high side, like the Pete?

Some of the later model 9spds are able to be converted into a 13-spd, but I have not heard of doing that to a 8ll, with the splitter top gears are roughly 17% splits on the 8LL or 9 its a 33% split, plus the 13 has a double over Some of the Mack 13's have just as good or better low hole than you 8ll plus you can still split the top side, I run a fuller 13 good trans. leaps and bounds better than any 9 or 10spd(fuller)

[mudslut28]

Mine has an 8LL and I agree with you...its is pretty long legged on the highside but it is pretty nice for the slower jobs.

[Bollweevil]

The 8LL in your application is basically a 9 speed over drive with a deep reduction rear box. Very similar to a 15 over. With the correct auxiliary drive gear it is possible replace the deep reduction rear box with a 13 over rear box and have a 13 double over. Aside from setting your hair on fire, it wouldn't address your issue of being a little long legged. Most of the on off road Macks in my area, with an 8LL run a 4.64 gear. They have plenty of low gear, and top out about 80 mph.