Rough shifting trans on my 93 F-250
Hi all! my '93 F250 is a farm truck, 351 EFI, 4X4, auto trans, used primarily for snow plowing. I don't let it sit all summer long without driving it up and down our dead end street at least once every 2 weeks to keep parts lubed, batt charged and the juices flowing. I took it for a ride last week and to my surprise first to second gear was a very hard shift with a big clunk. So I pressed on and second to third same thing, third to 4th was better. Slowing down it does the same as it downshifts. First thing I checked was fluid level once it was warmed up. It's right where it should be (installed new trans fluid, pan gasket and filter last spring). So based on a similar, past experience with my previous truck (1985 F-350 non-EFI) I went below and looked around for the trans vacuum module hoping it had failed, or mabe a leak in the line. This truck has neither, so now I'm wondering what could be causing the hard shifting? One last critical piece of information, last night I noticed the speedometer is not working. Am I going to be looking for a bad sensor / electrical / computer problem?
I don't have plates or insurance on this truck as it never goes on the road so a trip to the local parts place or dealer to plug it in for analysis is not an option.
Any suggestions, tips and observations are greatly appreciated.... the snow is only a matter of weeks away now!