I noticed a strange vibration in the 83 Ranger I own, it has the 2.3 and a 4 speed. When getting up to speed around 35MPH it would start vibrating, and the speedometer needle would bounce around and read slower than it was actually moving. This would start in 3rd gear, and continue thru 4th unless I let off the gas while it was in gear, then it stopped and worked normally. I put a grease seal in the tail section when I first got the truck, and when I pulled the driveshaft again today the seal was mangled and bent, plus there are metal particles around the main shaft where the seal goes. I figure the tail shaft bearing is shot, and I also found damage to the yolk with the U-joint, the shaft has a worn spot about 1/3rd the way around. My question is can this be fixed, or do I need to find another transmission? Also if there is anyone out there who lives in western NC who has parts cheap could contact me, I would greatly appreciate it! I am disabled and the money is limited, so if I can save something and make a friend in the process it would be great! I have had all sorts of problems with this truck, seems like it is never fixed. 828-803-4184 or 828-756-8036 will get me. Thanks in advance, CGB

 

The bushing can be replaced as well as a new or used yoke.

 

You can also fit a used driveshaft or just the front yoke to yours and get a good bushing surface. You'd have to call around for a good fit, but it's a lot cheaper than new {which are LIKELY unobtainable}.
As suggested, you can replace the bushing in the tail shaft if the wear hasn't gotten into the tailshaft housing itself. Otherwise get a different piece and bolt it on.
tom