Driveshaft Question

[vanscottbuilders]

Does anyone know the difference, in the number of teeth (I presume), between the coarse spline and the fine spline apparently offered in the Mack rear ends?

In my search for a single axle 4.17 ratio rear end - this question has been very common, and I don't know which one I have or which I need.

Thanks,

Paul Van Scott

[Rob]

Does anyone know the difference, in the number of teeth (I presume), between the coarse spline and the fine spline apparently offered in the Mack rear ends?

In my search for a single axle 4.17 ratio rear end - this question has been very common, and I don't know which one I have or which I need.

Thanks,

Paul Van Scott

Paul, the torque rating is substantially higher with the coarse splines. There is a lot more "meat" in the splines.

If you use a Thermodyne series engine, either spline size and type will work in your application. I would not use the fine, or smaller splines with a Maxidyne series engine as they will twist, and gaul, (over time and usage).

Rob

[b61fred]

Hi Paul,

I would suggest that either will work fine, I don't believe 200 hp will tear up too much.

If you are going for the junk yard differental I would make sure your u-joint match up

to the b-model transmission is the same, It will save alot of problems down the road.

I have been helping Garth Huff with this very same problem for a while, the fine spline

yoke seems to be hard to find. I haven't come across one yet. I am tring to talk the

Mrs. (soon to be anyway) in to going to mcungine, I hope to see you and your uncle there.

Fred

a.k.a. Morgan

[vanscottbuilders]

Thanks Rob and Thanks Morgan,

I was pretty well resigned to having to manufacture a new driveshaft anyway - so the yoke difference wouldn't be so bad.

There are a few of these 4.17 rear ends around - and I think I found one in Minnesota that has a complete Mack air ride too. It does have the coarse spline, but at least it is a front loading unit rather than the top loading Mack rear end. My alterations should be minimal.

Hope to see you at Macungie! Keep your phone on Morgan - I'll call when I'm close to the show grounds on Friday afternoon.

Paul VS

[Freightrain]

That sounds like the perfect set up Paul. I'd like to find one of those sitting in my back yard someday!!

[Packer]

While on the subject, Any one got a fine spline yoke floating around?

I'm in need of one!

Garth

(aka Packer)