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Two things. With turning already hard, a locked rear differential, unless it locks on demand (air, electric), would make the vehicle want to go in a straight line, as SP5 says. Most the time that's fine but turns would be hard (like a snowmobile at low speed). There is an argument to be made...

The 809 is a full time 6x6. The spragg clutch does relieve the difference you are talking about as long as the back is trying to over-run the front, which it will with a 13/14 ratio if you are even close to being equal with your front and rear final drive ratios. Also it is divorced, so works...

With the MTV you are moving out of what I have experience with. I thought MTV's used Meritor axles? I take it you have located a source for the IHC M9 axle and the Axletech that is the ratio you want (above). On an 809 series there is a 13/14 ratio in the transfer case that makes the back...

What parts do you have? Are you starting with a deuce or 5 ton? Age would matter on the 5 ton, since older ones have a spragg and manual transmissions. On the other side, the late 5 ton has the turbo Cummins 8.3 and auto that would be sweet. Price and availability favor starting with the 5 ton.

I think he is talking transfer of torque in the 70/30 thing. If they are going different speeds, like cornering, there is something accommodating the difference in that transfer case in the 70/30 mode where they are locked to equal torque in the 50/50 mode. But I don't have one of them to have...

There is a good chance the original halftrack used a spragg clutch to relieve a difference in rev's per mile.... or at least YOU could. Suprman would know about the SS, which might work also I see so many combinations you have went through that we need to start a bit more basic, like what...

Yes, I understand and remember the PD part now. Okay, two questions here; Do you have some parts that you are wanting to use specifically? If you said in the next post, I'll get there. I take it, these are examples of the M2/M3 and the M9. Are you using either of them as a starting point?

Since I don't know what it is, I guess the answer is no, not on g503. Was this conversation on another thread, I remember thinking about it but not seeing any conclusions?

What type of transfer case are you using? The older ones with a spragg will allow the back to over-run the front (but not the opposite). Put up your math and include the OD of your track drive sprocket that includes the track on it.