aftermarket posi rear
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New User
Joined: Nov 2003
Posts: 17
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aftermarket posi rear
I have a 2003 F 150 with the 4.6 engine 5 sp and 4x4. The truck came with an open differential 3.55 gears and I want to install a posi unit. The dealer told me that they can not fit a ford factory unit in my carrier, it was too small. This seemed strange to me and to a very experienced drive line shop in my town. My options include using an Eaton unit with carbon friction discs or a unit by Powertrax that mounts between the spider gears( I think) that supposedly is easier to install and gives excellent traction. Does anyone have an experience with these products or the inability of the dealer to install a posi unit?
Hotshot
Joined: Aug 2002
Posts: 12,679
Likes: 15
From: BC, Canada
I work at a dealer and have installed a few Ford limited slip units.
The carrier that the crown gear attaches to has to be replaced with the limited slip one. In that go the clutches, side gears, spider gears etc. It's not a big deal to do as far as the labour goes, not sure what the parts cost.
The carrier that the crown gear attaches to has to be replaced with the limited slip one. In that go the clutches, side gears, spider gears etc. It's not a big deal to do as far as the labour goes, not sure what the parts cost.
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
Dunno what the dealer is smoking.
I would go with the eaton unit over the factory unit.
BEWARE THE POWERTRAX/LOCKRIGHT CAN BE VERY NOISY. I did not like mine at all for the driving I do, but if you go off road its nice to have the full lock traction.
I would go with the eaton unit over the factory unit.
BEWARE THE POWERTRAX/LOCKRIGHT CAN BE VERY NOISY. I did not like mine at all for the driving I do, but if you go off road its nice to have the full lock traction.
Freshman User
Joined: Jul 2003
Posts: 32
Likes: 0
If you plan to use the truck mostly for wheelin' go with a Powertrax.
If you plan to spend most of the time on the road and do some moderate wheeling, the Eaton will behave much better out on the street and still provide added traction.
If you plan to spend most of the time on the road and do some moderate wheeling, the Eaton will behave much better out on the street and still provide added traction.
