There were Three different Differentials take your Vin number and ask your local dealer. Good Luck and Remember.
Change Your Mind, Not Your Oil.
Use the First In Synthetic Motor Oil's.
See My Bio For more information. Answer There should be a tag on one of the bolts on the rear cover. The gear ration is stamped on it.
Limited Slip Differential 3.55 gear ratio
2.833 is the rear-end gear ratio
The gear ratio is 3.60:1, this is for the front limited slip differential.
4.63
A good majority of the 1984 Ford F150 gear ratio had 3.00 gears for the stock. In addition, the spline should be a 31.
80W90 gear oil.
I own a 1984 F150 XLT with a 351w (5.8 liter) and a 4V Holley carb. I 'just' had the differential rebuilt and the Ring & Pinion gear ratio that was in there was 3.0. It is a 9" Ford differential (stock). I had it replaced (it was worn anyway) with 2.75 ratio for better highway driving. I am not sure about the HP, though. My truck is wholly stock and I have been giving it a 'rolling restoration' since my late brother passed away in 2006 (I inherited it from him).
85W90 gear oil.
more than likely a 3.08 gear.
9/41
An axle ratio is a comparison of the number of ring gear teeth to the number of pinion gear teeth in a differential. For instance, a 3.55 gear ratio means that there are 3.55 ring gear teeth to every 1 pinion tooth.
It would depend on the differential gear ratio and engine horse power/torque.