developed a nasty sound and vibration while foot is on the pedal. put in a new coupling on the rear drive shaft and that took care of the vibrations under me. still had them in the steering wheel so i pulled the front drive shaft and now its smooth as butter.

my question is i have pulled both u joints on the front shaft and they look good, they needed grease but over all they didnt look like what i was thinking they were going to look like, but can they still be bad? or is there something else that could cause this type of vibration and groan while under load?

thanks for any help

 

yes, fo sho can still be bad. or the shaft could need to be balanced. or could be output
i've taken 1310 and 1300s apart that looked perfectly fine, but after replacing.....no more vibration