pto question

[MACKS]

Does any one know if there is a rear mount one piece pto/pump that fits a Mack 12 speed trany?

[Lmackattack]

Mack made a rear mount pto that will fit the 2 stick 6 speed and 12 speed transmissions. as long as the 12 speed has the splined countershaft it should install just like they did with 6 speed.

Look at the rear countershaft covers for a stamp to indicate it is splined. It should be stamped with a "s" or an "x" I can't recall

If you want a married pto/pump unit the 6 and 12 speed has provisions for 6 and 8 bolt ptos

I don't recall a rear mount married pto as an option from Mack or other vendors?

In my opinion the Mack pto was the better of the 2 options.

[MACKS]

Thanks i had a rear mount and then switched to the side mount when we installed a drop axle because there wasn't enough room for the two piece rear mount,the shop that did the work told me at first he would install a one piece rear mount but then said he couldn't find one and went wit a side mount,maybe ill give mack a call,the side mount is a pain in the ass to use..

[MACKTRUCKS4]

I've had a few over the years but never seen a pto/pump rear mount. I have the side mount combo on my tri-axle and like you said, I don't think there would be enough room. My superliner with a 12 speed has the rear mount but the pump is mounted back on the frame with a short shaft.