limited slip differential

[citizendick]

im changing differential lube and not sure how to tell if it's a limited slip, tags are gone. rear is a d60 hd front is d44hd 6cf. any help would be great.i know im looking for clutches, not sure where. thanks dick.

[FORDification]

The fastest way of determining if you've got a limited slip is just to jack up the rearend to get both tires off the ground. Then with the transmission in neutral, spin one tire by hand and note the direction the opposite tire spins. If it spins the same direction, you've got a limited slip. If it spins the opposite direction, it's an open rearend.

[My427stang]

If you are pulling the rear cover to change the oil compare your carriers to the ones below.

From the front

1 - Powerlock (front) - unique and strong limited slip, you'll know it if you have one, see the difference in the case
2 - Trac-lock (center) - limited slip, not as strong, but they do just fine - see the small side ger in the center, just beneath it in the pic are a stack of small clutches)
3 - Open diff (farthests from camera) - not a posi, no clutches next to the side gears

[citizendick]

i just went out and spun the tires and yes it's limited slip,guess i have to get some friction additive. thanks for the help. i'll be under the truck thursday probably in the rain. it's great to have a truck to work on . dick

[citizendick]

thanks stang, the 90w that say's it's for limited slips left me doubting,so i'll get the additive. i havent opened the diff yet but i think the oil has been in there a long time.also doing the trans and transfer case should be a good day. thanks again dick

[heep70]

140w is better if you haul weight around. These clutched lockers get hot and will boil the lub.

[citizendick]

ok heep 140w it is, same for front? d44 big ball. also i was looking at your truck and was wondering about the cab running & marker lights were they a stock item? i really like the look. dick

[heep70]

90w is cool for the front dif. If it is still stock it is open.

The markers are added on by me. I like the look ao them at night. If you do them spend the cash on good ones.