Sorry for the bump just an hour later, but I'm in a bind. Anyone have an idea of where the speedo gear is? I know I am looking for it on the back of the transfer case, but it simply does not exist (or I'm not seeing it)...
Yes, you just unplug that connector at the transfer case, and the speedohealer comes with matching plugs that plug between them. Then you can either mount the little unit in your engine compartment or cab and program it to whatever your speedo is off, and it magically fixes it. Really really easy. Nice thing about it is you can dial it in exactly and if you ever change tire size or regear, just reprogram it.
At least you've got a really good slip yoke eliminator in the JB.
How do you tell how far off you are? Or does the computer automatically do it?
IIRC, you drive it at a certain speed by the speedo (60 comes to mind) and check how far it's off at that speed by GPS or someone next you, then they give you a chart that gives you a number to enter. It's something similar to that...it's been awhile. I know that it's real easy and you can adjust down to the mph. It comes with the instructions on how to do it.