I have a 1995 f250 and rear differential does not lock in when one side spins? Is there something i can do to fix it! Dont know if this helps but it has 3.55s in it!

 

What's the axle code on the information sticker on the driver's door jamb?

 

If its a open diff then you'll need a locker or a limited slip
If its limited slip them the clutches or worn out

 

I should be getting my truck back tomorow from just having a locker installed. Its getting a detroit tru trac.

 

Gabe, please give us a review of the try trac. Been looking at those a lot lately...

 

I'm not real smart about these rear ends. If its a limited slip is there a locker you can install? I'm not sure what the code is I will try to get it tonight!

 

I think it has a10.25 Sterling in it! I put it in about a year ago! I just couldn't remember what it was!

 

an oldie but a goodie:
Welded Dif, What the hell!!! - Pirate4x4.Com : 4x4 and Off-Road Forum

 

I love that thread. Lol

 

Did it have a bunch of little clutch discs in it?

 

I don't know if it did or not

 

But you put it in?

 

Sure did but I changed the housing and everything and only opened it up to see the gears and change oil!

 

The tag on the axle has the following code on it!
S 126 P
3.55 10 2 7F26

The axle code on the door is 39

Don't know if that helps or not!

 

Axle code 39 would be 3.55 open diff. If the metal tag doesn't have an L between the 3 and the 55, it's open diff. So your choices are a locker as described above, or a limited-slip diff (not as effective) swapped in. Look for a truck with an axle code of C9 (the code for 3.55 LS).