In all seriousness, Nigel, if you are not going to use it anywhere but on roads, and want it to still look authentic, then why not remove the entire front diff centre and axles, but leave the housing - reduces weight and the loss of power by the front wheels 'driving' the front diff. Combine this with the White Scout Car rear diff component change I suggested before. I had an F15 with that conversion, and it worked quite well.
The F15 and F15A have quite different front spring setups, so changing diffs and putting in a beam axle would, I think, look a little obvious.
The 01T truck has, I think, a far slower diff ratio than the F15A's 6.65:1, if my memory serves me well), so changing the rear axle for that would not serve your purpose.
Balancing the original motor also reduced vibration and harmonics, and ran more smoothly: a far more pleasant truck to drive.
Mike C
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