Yep, I'm going to get a new cable and hope it fixes the issue. I wish I knew why the trans was changed from manual to auto. I wonder if they used a different gear for the 12 bolt rear end than stock. I don't even know if the 12 bolt it has now is stock. How much do the sending units cost? Are they easy to install? Aside from learning how to replace the fuel pump, I get nervous working around fuel.
