Swap Mack T318LR tranny for Eaton 18 tranny

[Vac-Daddy]

I was hoping on getting some insight on doing a swap, Mack 18 to Eaton 18. My Mack tranny needs to be replaced and parts are hard to get and very expensive. I can purchase a very good Eaton 18 For quite cheap from a good buddy of mine. What's everybody's thoughts, please help? 2007 Mack Granite.

[Geoff Weeks]

boy, did we get "off in the weeds" on this thread.

[Joey Mack]

sure did..   But,,,, thats what we do here..  I did ask some off track questions that you guys were willing to answer...

[Joseph Cummings]

1 minute ago, Geoff Weeks said:

I just put my numbers into Spicer's driveshaft calculator and it spits out what I need to know. Critical and 1/2 true critical.

When I was in school we didn't have "driveshaft calculators". We had to do the math with a pencil and paper and a slide rule. I had to walk there in torrential rain wearing a yellow rubber rainsuit and galoshes. Uphill both ways

[Geoff Weeks]

Yeah, well he had to do it in snow!

[Joseph Cummings]

Starting at the lower right and ending with the upper left (I know its kinda Chinese or something) is how a power transmission shaft tries to distort as you hit each critical speed.

Think of an out of balance tire. You hit a speed and it's bouncing, speed up and it smoothes out, then you hit another bouncy speed and so on