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ws721

Mack 13 Speed

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ws721    251

Ok, so friend of mine just bought a Superliner that has Neway susp & a Mack 13 speed. Build sheet says it has 4.42 ratio. Now, the tranny has been changed from the Mack 9 speed. Truck has LoPro 24.5 tires. It will do more than 90 mph. And it still creeps around the yard nice & slow.  My question is, what is the Over drive Ratio for a Mack 13/18 speed? 

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j hancock    8,489

13.91 on the low side and .71 on the high side.

Check the stamping on the chuck.

4.42 with .71 @ 2100 rpm is 83 mph.

3.86/3.87 with .71 @ 2100 rpm is 96 mph.

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ws721    251

We couldn't read the stamping on the rears.  But that sounds like a great tranny with those numbers.   What is the Torque rating?  And thanks for that info

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j hancock    8,489

Torque rating is in the 2000 ft lbs range.  Mack triple shaft transmissions have moxie.

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ws721    251

Awesome. Think I want one of these Trannys for my Cruiseliner. Hmm,  wonder if they make a top loader for shift linkage?  That may be the deal breaker. 

Edited by ws721

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ws721    251
On ‎10‎/‎13‎/‎2017 at 8:54 AM, fullfuel01 said:

and me i want the old 6 speeds of your cruise-liner

 

No Problem.  I haven't removed it yet to keep the truck mobile.   We did use to haul some antique trucks this summer. ! of these years I will get that project started 

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