2nd Gen Non-Engine/Transmission A few Dana 80 questions

[rivercat]

A friend has a set of 3. 73 gears out of a ford with a dana 60 front and a 70 rear. The obvious question is with these work in my dodge with a 60 front and 80 rear. Is the time and money to swap worth it?<input id="gwProxy" type="hidden"><!--Session data--><input onclick="jsCall();" id="jsProxy" type="hidden"><input id="gwProxy" type="hidden"><!--Session data--><input onclick="jsCall();" id="jsProxy" type="hidden">

 

[MarkMiller]

Not worth the effort. The D70 gears will not work in a D80. The 60 gears might interchange but that depends on if the Ford 60 is a low pinion unit like the Dodge.

And with 35's you do not want the numerically lower gears. It will put too much load on your auto or your clutch.

 

[DGamelin]

He's right, that's the wrong way to go for gears. If you want to change them go the other way with the ratio. I don't remember ever seeing a ford 60 that wasn't a high pinion.



___________________________

93 250 2wd xc 354 auto 266k

04. 5 3500 4wd cc dully 373 6speed 9ok

 

[rivercat]

U guys must have 3. 54s I hate my 4. 10s I wana be able to cruise at 70 without it sounding like the motors in my lap. I have to literally slow down to around 60-65/2000-2200 to have a normal conversation. Plus Im sick of ford drivers and 3gen dodge guys touting their 20+ mpg...

 

[DGamelin]

Its not that it wont work but with those tall tires your trans is going to work a lot harder. The truck is going to fell lazy. And you wont see 20mpg with that truck up in the air like that on tall tires, sorry. Dont believe 1/2 of what you read or told about mpg. My 2wd 93 got 24mpg twice it gets around 19. My 04. 5 got 21 2 or 3 times but it's average is 16. It is easy to remember those 72 degree, tail wind days. How you drive it makes a big difference. My guess is lifted+tall tires+mods=you cant keep your foot out of it. And "there's nothing wrong with that". I am thinking of putting 4. 10 in my 04 I wish they were there I tow big with it. If you are going to try it do just the rear axle, drive it for a weak or so tell us what you think. Take the front drive shaft out and leave it out until the gears match.



_________________________

93 250 2wd xc 354 auto 266k

04. 5 3500 4wd cc dully 373 6speed 90k

 

[DGamelin]

Have you recalibrated your speedometer? At 70mph you should be at 1912 rpm's. 65mph = 1775 rpm's, 75mph = 2049 rpm's. That's figuring 410s, 34. 8 tires, and 48re auto trans. Not sure what trans you have. Check out Gear Ratio Calculator



_________________________

93 250 2wd xc 354 auto 266k

04. 5 3500 4wd cc dully 373 6 speed 90k

 

[DIESELWRKS]

U guys must have 3. 54s I hate my 4. 10s I wana be able to cruise at 70 without it sounding like the motors in my lap. I have to literally slow down to around 60-65/2000-2200 to have a normal conversation. Plus Im sick of ford drivers and 3gen dodge guys touting their 20+ mpg...

I just installed 37" and when I had 35" on I was turning 1750ish for 65-68mph. I used my smarty and adjusted while watching my GPS. I got great mpg's 19-20 while using smarty fuel saver and light foot. this is all freeway. around town I get 14ish because of heavy foot. with 37" Im at 1850ish at 65. I would hand calculate. get a gps or borrow one and see what you are really driving.