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.

[Joey Mack]

'07 Granite??  CV-713??   So you have an MP-7 engine?  and not an ASET-IEGR? 

[Vac-Daddy]

You bet

[Vac-Daddy]

[Joey Mack]

ok..  I was just curious..  Love the picture.  get the Eaton and have the driveshaft re-done..  Thoughts??  Eaton's kick a$$.  Mack's are tough, but cost a fortune to repair.. as you well know..  

[Vac-Daddy]

Do you know anybody who's done this swap? I'm worried about the gearing, if i'm gonna be okay or not? Like, if i'm fully loaded, will I still be able to take off out of a driveway on a steep hill...... Are my pto's all gonna be different.  This potentially puts me out of business, depending on the outcome $$$$$$$ I'm terrified 🥺 this is the info on my truck.

[Joey Mack]

I dont have the Eaton book that tells the ratios, But I do have the Mack Book..  I will try to post a picture of the ratio's.. 

[fjh]

11 hours ago, Vac-Daddy said:

Do you know anybody who's done this swap? I'm worried about the gearing, if i'm gonna be okay or not? Like, if i'm fully loaded, will I still be able to take off out of a driveway on a steep hill...... Are my pto's all gonna be different.  This potentially puts me out of business, depending on the outcome $$$$$$$ I'm terrified 🥺 this is the info on my truck.

I have a concern here Is your buddys trans Out of a mack? The bell housings is a diffrent set up for mack and western star ! being a 2007 this is a change over year are the rear  engine mounts  actually on the engine or the trans!?Your doing the right thing by going eaton BUT you need to do your home work as you are doing here! 

[Joey Mack]

fjh,, he has an MP-7.. so mounts are on the engine..  I dont have a lot of info for him, but can probably post the ratio's from the book.. That will be as far as I can help.. jojo

[Mark T]

1 minute ago, Joey Mack said:

fjh,, he has an MP-7.. so mounts are on the engine..  I dont have a lot of info for him, but can probably post the ratio's from the book.. That will be as far as I can help.. jojo

That's a CV   ain't no MP7 in that one. AMI on a vac truck ? I foresee a hole in the side of the block where a wristpin gave up.  Personally, I don't think this is a good choice for a man depending on an income...Fuller, Mack or any transmission 

[Joey Mack]

I asked him in the beginning of the post and he said ''you bet''..  If not, well then I am wrong.. 

12 hours ago, Joey Mack said:

'07 Granite??  CV-713??   So you have an MP-7 engine?  and not an ASET-IEGR? 

 

11 hours ago, Vac-Daddy said:

You bet

 

[fjh]

24 minutes ago, Joey Mack said:

fjh,, he has an MP-7.. so mounts are on the engine..  I dont have a lot of info for him, but can probably post the ratio's from the book.. That will be as far as I can help.. jojo

I thought I read 460 ai Earlier?

[Geoff Weeks]

Eaton ratios are available online, depends on the age of the transmission in question. Starting in the low end will unlikely be a problem, top speed may be depending on rear ratio.

PTO is going to have to be changed out, and matched to needed speed.

Not going to be a cheap, swap.

 

[fjh]

1 minute ago, Geoff Weeks said:

Eaton ratios are available online, depends on the age of the transmission in question. Starting in the low end will unlikely be a problem, top speed may be depending on rear ratio.

PTO is going to have to be changed out, and matched to needed speed.

Not going to be a cheap, swap.

 

it  will be least be more reliable ! 

[Geoff Weeks]

here are eaton's ratios

https://www.eaton.com/content/dam/eaton/products/transmissions/vehicle-transmissions/eaton-transmission-specifications-catalog-en-us.pdf