i have a 75 dodge powerwagon and need info. it has a 78 440 under the hood, also np203 transfer and i believe a spicer 60.

1? what is the proper tire size; my speedo reads less than what it should?

2? is spicer and dana the same?

3? what type of tranny should i have; it is an automatic?

4? is it 1/2ton or 3/4ton?

5? can i add after market locking hubs?

spicer is dana ... i think this is how it goes.. spicer came out with a new idea for a joint and dana bought it out spicer was some guy that came up with it

spicer parts are better than dana or spicer just makes some parts and dana makes the rest im not sure but there the same ither way

being that its not a one ton i truely doubt its a 60 its a 44 and im real sure about that not to worry a 44 isnt too bad

(44s are for 1/2 to 3/4 ton trucks mostly) 60s are for one tons only other than a ford snowfighter (or are they just a super heavy 44?)

anyways you got a 44 unless someone put a 60 in for you and i dont think thats the case

you have good full time locking hubs you want them they are the way to go i think (tell me if im wrong someone) i have heard nothing but bad news about locking hubs you have the bolt flange type right? thats the old style and there stronger.

no idea about your rig couldnt tell you really (question 3)

run bigger tires is all i can say that should make the speedomoter read right if not that just figure out how much it is and how fast your really going ... just guess

Chuck,

If you've got less than 8 lugs on your wheels, it's a 1/2 or 3/4 ton, as for tranny if it's an auto, I think it would be a Torqueflight 727. As for tire size/speedo problems, that depends on your axle's gear ratios and stock tire size.  Randy's ring and pinion has a gear ratio calculator that might help you figure it out. Check for a tag on the diff case that will list the ratio such as 3.73 or 4.10 or number of teeth on the ring and pinion ie 41-10  (41 teeth on the ring gear  and 10 on the pinion) would be 4.10 ratio.  Probably as old as your truck is that tag is long gone, so jack up your truck, mark the driveshaft and tire.  Make one full turn on the tire and count the number of times your driveshaft turns, that will give you an approximation of the gear ratio. I doubt you have anything lower (numerically higher) than 4.10s unless somebody has already changed the gears.