Gear question??
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Joined: Aug 2006
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Gear question??
Hi i have a 79 F150 4x4 6inch susp. 3inch body 351m NP435granny4speed NP205transfer case and i am currently running 4.11s in the rear and 4.09s in the front have purchased 4.86s for back and was planning on running 4.88s up front my question is that i have came upon a set of 4.56s cheap and wondering if they are to far from the 4.86s to work properly together, this truck is strickly a toy, off road only
Post Fiend
Joined: Mar 2005
Posts: 8,542
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From: Louisiana
Welcome to the site.
It depends on what size tires you'll run.
With 9" of lift you have plenty of room to run 42s without much problems, other than the 1/2 ton axles wanting to blow.
If you go with 4.56 gears, tires could be anywhere from 35-38s with that transmission, but if you want to run bigger, then you might want to try and get some 1 ton axles and regear them instead of upgradeing the 1/2 tons that couldn't handle a tire over 38s to good to start with.
It depends on what size tires you'll run.
With 9" of lift you have plenty of room to run 42s without much problems, other than the 1/2 ton axles wanting to blow.
If you go with 4.56 gears, tires could be anywhere from 35-38s with that transmission, but if you want to run bigger, then you might want to try and get some 1 ton axles and regear them instead of upgradeing the 1/2 tons that couldn't handle a tire over 38s to good to start with.
i ain't rite
Joined: Mar 2005
Posts: 65,562
Likes: 5,600
From: Marlboro Mental Hospital.
if you are only going to be running 4 wheel drive in loose sloppy mud, there will be no problem.
this is commonly done is mud boggers to turn the front and rear tires at different speeds, with the fronts spinning a little faster, but if you are going to be driving on hard pack, the difference will give you bad axle bind, and cause eventual transfer case failure, or other drive line problems and failures.
you can run the 4.88 in the rear and the 4.56 in the front on the road or off road on hard pack, but you will have to compensate for the different gear ratios with different size tires front and rear.
this is commonly done is mud boggers to turn the front and rear tires at different speeds, with the fronts spinning a little faster, but if you are going to be driving on hard pack, the difference will give you bad axle bind, and cause eventual transfer case failure, or other drive line problems and failures.
you can run the 4.88 in the rear and the 4.56 in the front on the road or off road on hard pack, but you will have to compensate for the different gear ratios with different size tires front and rear.
