Can you tell from the VIN # if your truck has posi or not? I realize I could jack it up and spin by hand ...No?

 

look at you axle code on the cerification label...97 means you have an 8.8 4.10 open diff and R7 means you have an 8.8 4.10 LS

 

Truck is an 05 where is certification label located?

 

drivers door jamb

 

Copy & paste the following website address into the address bar of your web browser and add the VIN at the end of the address. That will (might) get you the window sticker:
http://services.forddirect.fordvehic...icker.pdf?vin=

I think this only works on newer vehicles. It doesn't work on my 2004 Ranger, but it gives me the window sticker on my 2011 Fiesta.

 

only way you will hav an r7 axle is if you have a leveal 2 fx4. its unlikly you have an l/s unless you have an off road package

 

There is a tag on the diff cover. 3L73 would mean 3.73 with posi, no L non posi. 4L10, etc....

 

open the drivers side door and look under "AXLE" on the tag. If you can't find the door tag just do a burnout lol

 

he could have an ls and do a burnie and only get one to fire still.

 

true if his clutches are all burnt out. mine spins both every time with 111k haha

 

I beleive its non posi (ls) thanks for all the input you guys are very helpful.

 

you could have a R7 code 4x4 offroad package too, it isnt only a fx4 specific code