I don't think that you can get any ratio below 3.54 in a Dana 60 or 70. Check Warn's website for lockout hub applications for rear axles. I will use 4340 for my shafts.
Rockwell C 45 should be the upper limit for the shafts.
Dave Fillman
45 MB
68 Hemi-Cuda
---- you wrote:
> Dave,
>
>
> >...... I work at NEAPCO and since my initial query, I have found that we
> make the correct spline stub shafts for both the differential and locking
> hubs. 1 1/8-10" is used on both ends of the front shafts and the rear
> differential. I have decided to make my own heat treated shafts
>
> So you are a drive-line engineer with Neapco, huh? I'm an engineer also,
> used to work in the aerospace industry but now have my own littel shop.
> Anyway.... I have a question for you. I am doing a project similar to the
> above topic of adding lockouts to an MB rear which would require an axle
> shaft with a spline on each end (no flange). I am looking into making up an
> axle for a suburban (3/4T) out of different centers and ends. The reason
> has to do with required axle ratio. I need to get below 3.0:1 and I won't
> consider anything lighter than a Dana 60HD or 70. One of the options would
> have me needing to make axle shafts with splines. I have no problem with
> the machining and the splining, I do this for one of my customers (tunnel
> drill tools). My big question is...... if one is going to use steel bar
> stock to make the shafts, what alloy is typically used? I had heard along
> the line that 4340 was used for racing applications. And, what heat treat
> specs would typically be used? It would seem to me that garden variety heat
> treating of 4340 would leave you with a part that is thru hardened and may
> not be all that good for the application. I had my share of ME classed but
> it's been almost 20 years. Any thoughts you would have would be greatly
> appreciated.
>
>
> je
>
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