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Discussion Starter · #1 ·
Hey Guy's, I'm a Jeep owner who recently bought a 81 F-150 4X4 that I plan to use to tow the Jeep.
The Truck had a camper on the back and has extra leaves for the weight. The truck is verry "stiff" with no weight in the back. If I take out these add-a-leaves will that affect the towing capacity of the truck? Also, how do I find out if the rear end has a posi in it? And one more thing, what were popular gear ratio's used? Thanx Greg
 

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rearend gears are probably either, 3.55 or 3.73. But if it has a towing package and all the bells and whistles it might be a 4.10. to find out if you have posi, light em up....

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GO FORD OR GO HOME!!
 

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Discussion Starter · #3 ·
Thanx, I'll do it tomorrow!

Its too cold to jack her up and count the drive shaft rotations.

I don't have a overdrive tranny, so I don't think it has a tow package. Greg
 

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Mine has just a beefy c6, and I dont thinmk ford offered a over drive till 85, but hey i could be wrong.

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GO FORD OR GO HOME!!
 

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If u check the diff tag it should say the gear ratio somehwere, and if it says has an L in the ratio it means it is a limited slip Ie: 3L55.

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If it aint fix dont broke it.
 

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also all you have to do is jack the rear of the truck...then rotate one one of the rear tires if they go in the same direction, then you have a posi, if they go in oppsite directions, then not!

also if its a camper special or trailer special it most likely will have lower gears and probably a posi unit (limited slip)..if there is no tag on the back try the front, the ratio will be up or down a tooth from the rear..good luck!
 
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