Parts catalog doesn't differentiate, so: 2WD & 4WD.

Dana 70: F350, but...

No F350 4WD's until 1979, and these came w/Dana 60's front/rear.

 

Ok my semi related dumb question:

Higher ratio= more torque/pulling power.

Lower ratio= lower rpm cruise/ higher mpg.

And a 4wd would need the parts swapped both front and rear if you wanted to change your ratios.....and a new speedo gear.

 

Numerically speaking yes. Front and rear do need to be changed on a 4wd. If you want an accurate speed reading, then yes...change the gear.

 

well, I opened it up yesterday and counted the ring teeth - 41. I tried to count the pinion teeth but couldn't see them all the way around, got to around 10 I think. ALSO, found out is is L/S. Now if I could only find the socket to get the hubs apart so I can change the brakes, nobody in town has one.

 

Read below, this is easier to understand.

Higher ratio=lower number, example-2:73=lower rpm cruise/ higher mpg/highway driving like going to see grandma on Sunday.

Lower ratio=high number, example-4:56=more torque/pulling power/keeping your butt from getting stuck in mud on Saturday at mud hole.

GOVTMOD nice color, is it Coral or orange?

 

Where do you live...deep in the Ozarks?

Even in my little backwoods town Napa always has one of those 2 9/16" sockets hanging on the wall behind the counter.

 

We have three Oriellys, two Advance auto, Carquest and an Autozone. NONE of them had it, and I don't think we have a Napa. I even tried Sears with no luck. Ended up borrowing one from our Hydraulic repair shop in town,, it fit the nut but would NOT fit in the hub. I gave up and am going to order one online later.

*You sure it's 2 9/16ths? the one I borrowed that fit was 2 1/2"???

 

Yea, it's 2 9/16" NAPA Part #KDS2436 (though i believe that number has since been replaced).

 

Yea, and did they delete 1/16th too

 

The additional 1/16" is 'special order' and costs extra.

(Sorry OP....back on topic)

 

lol, special order for sure.

 

Thanks, its orange the original color was dark green. The very brief PO did a quick crappy spray job after doing some quick bondo and fiberglass work on the cab corners and rear fenders. It is very photogenic. If I ever get that far it will be a dark blue, gray or black.

I had my rear end up last night and so I spun the wheels, twice (open diff) and got 3.70.

 

You have 4.10's. The way an open differential works (and a locker or limited slip if you are rotating a tire by hand) is the sum of the two wheels turning is equal to the rotation of the driveshaft. For example, if you were going straight down the road at 20MPH both tires are turning at the same speed. If one tire were suddenly to lock up all the rotating force from the driveshaft now gets transferred to the other wheel. One would be rotating at 0MPH and the other would be rotating at 40MPH (averaging out to 20MPH). This is why you are of by half. You are only turning one tire.