I am getting alot of vibration around 55mph and I am pretty sure it is my front prop shaft going from the transfer case to the front diff. I can shake the shaft and get movement out of the u joint going to transfer case. I am going to try greasing the shaft to see if that helps but if it doesn't I am wondering if I can just replace the u-joints on the shaft with a press or if I actually need to buy the entire new shaft? Cardone Reman/Driveshaft (65-9358) | 1994 Chevrolet S10 Blazer 4WD 6 Cylinders W 4.3L CPI | AutoZone.com

 

it's not too bad to replace them. i think those may have the plastic retainers you have to melt out. (or is that the rear)
anyway it should take about an hour $20 -$40 for the u-joint. couple of sockets, hammer, a vice and you should be good. don't forget to grease the new u-joint!

 

The front drive shaft should not be rotating when not in 4 wheel drive , the cv axles rotate , but unless you have all time 4 wheel drive it shouldn't be rotating . I have a 94 also and my drive shaft had to be heated in order to push the shaft back . But unless I'm missing something I really don't think thats the problem .

 

The front drive shaft u joints are not greaseable I think, I'm not talking about the half shafts, I am talking about the drive shaft that goes from the transmission to the front differential. I can shake it up and down and it has a decent amount of slop. I found u joints for the drive shaft but do i have a press on slip yoke seal or a screw on one? I have a 94 4x4 4.3W s-10 blazer. here is the link for them, U-Joint | 1994 Chevrolet S10 Blazer 4WD 6 Cylinders W 4.3L CPI | AutoZone.com

Can anyone describe to me how I change it out once I unbolt the shaft what do I press out or screw out? I have never delt with u-joints but I am sure it's not that hard once you do it.

I guess I must have missed the fitting when I was trying to grease the shaft, I will look again tonight.

 

I replaced mine with a ball joint press rented from auto zone and an impact wrench. Works awesomely! Definitely much easier then melting them out.

 

the factory joints are non-greaseable.
atvwarror is right it could be the half shafts or the ball joints.

 

Nope, I replaced the ball joints a few years ago and I know what a bad half shaft sounds like.

How do I know if I have a press on yoak seal or a screw yoak seal?