what rear end ratio options were offered for a 3.9 4x4 ax-15 5 speed dakota?

 

There was 3.21, 3.55, 3.9. Which was to specifically for your setup, we don't know. But you can check the tag under the hood or count number of rotations of the drive-shaft per 1 turn of the wheel.

 

yea i dont have the truck just the engine,tranny,t-case in my jeep yj.. what i am trying to do is figure out what year engine i have and i have found that the dakota got about 22 mpg with the 3.9/5 speed set up. I just got the jeep on the road and by ear it sounds like i am running a bit high in the rpm's at 60mph.. i have 33x12.50x15 with a 4.10 rear end... so i am trying to take a 93-96 dakota with 3.9-5 speed-27" tires and i need a rear end ratio so i can do the math on my jeep... tomorrow i am installing a tach so i know for sure what i am turning... if someone has a 3.9- 5 speed please let me know how many rpm's at 60 mph you are turning.. ty

 

with 3.55s I think its right about 2k rpm, give or take 200 rpm.

 

Marcar, I think you are right on with 2000 rpm, wonder how much extra it would rev with the 3.9 gears?

 

2000 = x
3.55 3.92

2000(3.92)=3.55x
x=2208

So around 2200 rpm

 

good info, ty

 

you maybe can check a mph calculator and get the info you need from this info. my truck is '96 v6 ax15 3.90 gears, 2,700ish rpm at 70mph with 235/75 r15 tires. cant remember at 60mph. i might get around to driving it today and ill check.

 

and what kind of gas mileage do you guys get.. 17+?

 

ok my memory is alittle off. 70mph was about 2,500 rpm. 60mph was 2,200. just checked tonight. not exact sure on the mileage of mine but it sure aint 20mpg. maybe 17 but like i said i havent checked it accuratly yet but i can gaurantee mine aint even close to 20