mackaddict

Lucky we have an extra tranny to throw in it. Still gonna be a chore. I'm just gonna swap em out, install a new clutch, and rebuild the offending tranny. Its a shame they gotta tear it up!!!

I done a set on a Granite not too long ago. Its very time consuming and hard work. If you end up doing it yourself, check the t-boxes and insulator pads to make sure they're still good. Don't hurt to go ahead and change them sos you ain't got to tear it back down later.

Hi, I am from Arkansas. I am a mechanic. I work on Macks, Volvo, and the occasional Pete. I like Football, Fishing, and old 60s muscle cars!!! My fav trucks are Macks and Peterbuilt. Just want to say Hi and like the site!! Very helpful!!!

Sounds like the teeth are worn off on the low range side of the range shift, when you put the power to it, the sliders push apart causing it to jump out of gear.

Common problem on the Mack T200 series transmissions, a 2007 would probably have a T300 series transmission though.

It is a T310. The normal driver was off, an inexperienced driver drove the truck for a couple of days, he come back only to have it slip in 5th gear. We haven't had any problems with transmissions for a long time. They hired a couple of new drivers. The guy that drove the truck has only been driving for a few months. Appreciate the help. I will pull the top cover and see whats going on. I was thinking maybe the air valve on the top of the tranny was bad untill I got to drive it today. Makes a really bad grinding noise in the low range.

I have a 2007 Mack CV713 granite with a 10 speed tranny. It started jumping out of gear in the low range (5th gear) now it jumps out in all low range gears. I was thinking it might be a shift fork when it was missing 5th gear but now I don't know for sure. Has anybody run into this problem before?