Paul H.

I should know this but I don't. I am going to change my diff. and transfer case fluids soon and was wondering what the manual means when it says A.D.D. or except A.D.D.?
Thanks for the help.

HBoss

Automatic Disconnecting Differential.

If you have part-time 4WD, like me, it comes at the push of a button. Your front hubs autolock, unlike manual hubs where you have to get out, crouch down by the front wheel hubs and turn them to lock them.

I hope that was a good explanation... Anyway, if you have the ADD, it usually takes more gear oil capacity in there, than without ADD. So you might have to purchase more gear oil. Generally speaking, that is.

Hope this helps.

Al

Yoda

ADD is the axle drive disconnect. If you look under the front of your truck, you will see the front diff and the axle shafts that go to the front wheels. As you look at it, iff there is an access cover (and vacuum hoses ectc) on the stub out the right side of the diff, it has ADD. If it just looks like a stub shaft with no cover it does not have it. If your truck had or has automatic hubs, you probably have ADD.

Paul H.

Thanks HBOSS and YOTA.