How can I check if I have manual hubs? I saw the thread with locking diff button, and I don't have that, but then again I have a 2nd gen and it might be different. The OM wasn't too helpful about this, so I hope you are.

I have a 94 SR5 V6 3.0 5-speed.

 

post a picture of the front wheel of your truck

 

You would have to get out and turn a red dial on your hub as seen here on the front wheels.

ADD hubs you do not get out to turn the hub to lock 'em in.

 

Thx... if any confusion I'll post pics tommorow.

 

I think all the early 90s SR5s came with ADD. If so you won't have manual hubs unless a PO changed them already.