Question Posi rear end

[sss521]

I was wondering how to tell if a rear end has a posi in it? Is there a certain nuber of letter on the housing? Just wondering what to look for.

 

[DaveBen]

Look on the drivers door post. There is an id tag and it will have the axle type posted on it. Give us the letter for the axle and we will tell you if it is a posi or not.

Dave

 

[sss521]

I got the type

the letter on the door sticker is C1

 

[DaveBen]

You have 3.73 with Limited Slip. Most common for this truck.

Dave

 

[BamaSixGun]

Is or is not a limited slip diff a posi diff?

 

[DaveBen]

Ford puts in a LIMITED SLIP (their words) and not a POSI. GM uses the term POSI, I think. He does have a LIMITED SLIP, according to FORD's DVD. What is the difference between POSI and LIMITED SLIP? Nothing that I can see, they are both clutched rear ends.

Dave

 

[BIG JOE]

Ford puts in a LIMITED SLIP (their words) and not a POSI. GM uses the term POSI, I think. He does have a LIMITED SLIP, according to FORD's DVD. What is the difference between POSI and LIMITED SLIP? Nothing that I can see, they are both clutched rear ends.

Dave

On what Dave sez.

Just Trade Name stuff. Limited Slip-age or Posi-tive traction, when you need it ?

 

[ponyexpress94]

Just to add a bit of information...the axle code on the Drivers door post will be one of two types. Type one is two numbers which indicates an open rear end. Type two is a letter followed by a number which indicates a limited slip rear. This is universal across all ford trucks from all years.

 

[kingkevindavid]

Many people confuse a "limited slip" or a "Posi" with a locker. A locker keeps both wheel engaged at all times no matter what is happening.

 

[BIG JOE]

Many people confuse a "limited slip" or a "Posi" with a locker. A locker keeps both wheel engaged at all times no matter what is happening.

Very True, and a Very Good point Kevin