blue924.9

what gears do you have in the back, that makes a difference i have 3.08s in my 92 on slightly larger than stock tires and get 20+ mpg regularly. i also drive at the speed when it shifts right into overdrive, around 52 mph, 4.9s have enough torque to do this, with a 5.0 not a chance to high strung

jmuriel15

im not sure what gears i have and im not sure how to find out? suggestions?

sylver91

On the door jamb will be the axle code and a number, that tells you what gears you have.

Axle Decoder Chart

Code Ratio Capacity Maker Type Yr

12 2.73 3800 FORD REG 1991
17 3.25 3300 FORD REG 1971
17 3.31 3800 FORD REG 1995
18 3.08 3800 FORD REG 1991
19 3.55 3800 FORD REG 1991
25 4.10. 5300 FORD REG 1991
29 3.55 5300 FORD REG 1991
35 4.10. 6250 FORD REG 1991
36 3.73 7400 DANA REG 1980
39 3.55 6250 FORD REG 1991
45 4.10. 7400 FORD REG 1991
49 3.55 7400 FORD REG 1991
65 4.10. 8250 FORD REG 1991
69 3.55 8250 FORD REG 1991
72 4.63 11000 DANA REG 1991
73 5.13 11000 DANA REG 1991
H5 4.10. 3800 FORD LIMITED SLIP 1991
H7 3.31 3800 FORD LIMITED SLIP 1995
H8 3.08 3800 FORD LIMITED SLIP 1991
H9 3.55 3800 FORD LIMITED SLIP 1991
B5 4.10. 5300 FORD LIMITED SLIP 1991
B9 3.55 5300 FORD LIMITED SLIP 1991
C5 4.10. 6250 FORD LIMITED SLIP 1991
C9 3.55 6250 FORD LIMITED SLIP 1987
D5 4.10. 7400 FORD LIMITED SLIP 1991
F5 4.10. 8250 FORD LIMITED SLIP 1991
W5 4.10 8250 FORD LIMITED SLIP 1995

jmuriel15

thanks. is there a gear ratio you recommend for better gas mileage?

sylver91

Depends on you're driving habits and daily route. Because you have a lift and I assume bigger tires, a high hear ratio robs power as the truck has to work harder to get it to roll.

So I would have something in a lower range, 3.55 or 4.10

blue924.9

if you dont have larger tires then 3.08s like i have seem like a good combo there are some fairly large hills in my area and the way i drive it kicks down and puts the rpms in the peak torque area with my 4.9 but that depends on the motor. if you do have a lift and bigger tires then i would go around 3.83 for a good medium gear