f-600 4x4 1978
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the front dif is a rockwell fds 75... I spinned the wheels and i counted about 7+:1
Ime not triying to get that much speed... just think the diessel will be too loud at that speed with this ratio (about 3200 rpm)... I would prefer it to be around 2500-2600rpm... ive heared about some chevrolet spicer auxiliary gearboxes that came on series 70-80 trucks that had low-direct-overdrive gears... something like that is wath i need... but those are rare...
Ime not triying to get that much speed... just think the diessel will be too loud at that speed with this ratio (about 3200 rpm)... I would prefer it to be around 2500-2600rpm... ive heared about some chevrolet spicer auxiliary gearboxes that came on series 70-80 trucks that had low-direct-overdrive gears... something like that is wath i need... but those are rare...
#6
If you did it both ways, you should have got two different readings. If both wheels are off the ground and both wheels are turning that should give you a true count. If one wheel does not turn at any time when you are doing it, you will get a false reading. If you do it with one wheel off the ground and the other solidly on the ground then you divide by two or double it, can't remember for sure which it is. From the high reading you got I would guess that you would divide it by two.
#7
7.something sounds about right to me too. No way they would have 3.50 gears in a big truck back then. How about some HEMTT 16.00X20's? A tall tire would lower the engine speed, but at 95hp, it isn't going to work. If you go to a truck wreckin yard, and get a brownie box, it may help. Some guys stick em in backwards, and get a 200% overdrive. Why such a low hp rating? Get it at a good price?
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The way to determine if it's factory installed 4WD is by the AXLE code found on the Warranty Plate, and/or by the first 3 digits of the VIN.
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