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Mack 13-speed SWAP TO allison


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Hey guys its been a few weeks since yall last helped me with a problem I was facing on a timing issue with a truck. Well now the boss handed me another dumb request. He wants me to pull a perfectly working 13-speed mack t2130 tranny from a 1996 CH613 with an e-7. I have most of the parts for the swap including: an allison HT740RS tranny, a heat exchanger to cool the oil, torque converter, bellhousing, spacers, mounts, and most of the hardware. I am aware that I will have to get the driveshaft refitted to it but I will take care of that later. My concern is that this transmission was pulled from a 1994 mack that also had an e-7 but the injection pump had an air actuator that was connected to an air throttle pedal! The reason for that was that the modulatoe for the transmission kick-down was air operated. I now have the correct electronic replacement modulator for the ht740 that I intend on using with our CH truck. Can anyone give me any insight on how to wire this thing? Any and all tips are greatly appreciated. Thanks!

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Sounds like an Allison out of an older Post Office Mack. Being it had an air throttle, it's probably out of an early 90s model with a mechanical engine and your '96 probably has an electronic engine. It's possible to make it work, but gonna be a lot of hassle. BTW, that Allison is a direct drive and you'll lose some top speed.

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Gearheadgrrl, you're actually dead on with your theory. So since I will be using an electric 12 volt modulator that I got from allison how should I go about wiring it all up? I have heard that power and maneuverability becomes a problem so I am prepared to have my ecm fladhed for somewhere around 400 HP and added torque. The tranny can handle it. How much top speed will I lose? The max I can run on the truck is 75mph at about 1900rpm

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Should be a .68 od in the 2130 and a 1.1 in the Allison, what size drive tires and gear ratio does the truck have?

"Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin

"If your gonna be STUPID, you gotta be TOUGH"

"You cant always get what you want, but if you try sometimes you get what you need"

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Bullhusk do you have any details about these three speed aux trannys? Do thry just bolt up to the tail of an allison or what's the deal? I am in desperate need of tips to make this swap work. But I'm very limited to the truck and tranny I have for the swap

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Well with a Mack OD trans (with .68 OD) 44" tall 11r24's and 4.17 rears your looking at 1500rpm @70 great cruising rpm for a Mack engine they build torque best from 14-1600, at least thats where all of mine have run the best. if you swap to a 1.1 top gear Allison, keeping the 11r24.5's and 4.17 rears your looking at 2200rpm @ 70, I just couldnt make the swap to a direct automatic from a Mack 13, I am all for vocational trucks to be equipped with an Allison but the gearing is just wrong here. Going to a 4.42 rear keeping everything else the same gets you 1600 @ 70, 4.64 rears would be 1700, and swapping to 22.5's with 4.17 gets it to 1650, with 4.42 and 22.5's = 1750. Why does he want to swap it to the Allison? what is it primarily used for and how much time does it spend off road? I think there are better options out there for a CH than an allison especially one obviously set up for on road use.

"Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin

"If your gonna be STUPID, you gotta be TOUGH"

"You cant always get what you want, but if you try sometimes you get what you need"

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