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Most 5748 were fitted with the modified GMC front axle from army surplus. The 6748 mostly had the Zetor designed front axle. Are you sure they both had the same driveshafts ?
A 5748 and a 6748 are the same tractor only difference is the fueling.as far as im aware the only other axle used by zetor until they started using carraro axles was on the 30 some thing?we had one it only had a single hardy spicer so the lock was terrible.but a great wee yoke.
6718 had a different engine, with 100mm bore instead of 95. The standard axle was the Zetor built one, though i have seen some with the GMC axle like the 3045