So, what did I do now?

[MattL]

I recently put my 242 and driveshaft back in my car after realizing my 245 wasn’t ready to be installed. Torqued everything down to manual specs, put new fluids in, etc. Put in a new clutch slave. It’s been driving fine since, although I only take it out on weekends. I’ve probably put a couple hundred miles on it since putting the 4-speed back in. Today, though, I took it out for a very short drive and noticed within a few miles a knock under the car whenever I went over a bump. I turned around and headed home. Within another mile, the knock started happening without bumps, and then was joined by very jerky forward motion, like there was a fuel issue or something. Frequency was proportional to road speed. Depressing the clutch made the jerkiness go away. I limped home at about 20 mph. 
 

When I pulled in, I saw some fluid on the garage floor. Brake fluid. Looked under the car and it looks like the clutch master cylinder is leaking from inside the pedal box. But would that explain all the other stuff? I didn’t see any obvious issues with the giubo or driveshaft in general. 
 

One other thing that could be related: the input shaft of the tranny has a bunch of play in it. It must have had it since I’ve had the car, but I didn’t know until I pulled the unit out. Never seemed to cause any problems other than an annoying rattle that I initially thought was the pilot bearing. 

 

 

[tech71]

When you looked at your driveshaft did you check out the Center bearing support? For security and condition of the rubber support?

First place I would look.

If the car is securely on stands, grab the driveshaft and push/pull it a bit along its length, see if there is any play or noises.

Edited November 1, 2020 by tech71

[irdave]

And double check that everything is tight...

[Preyupy]

Bolts holding the drive shaft to the differential flange?

[man_mark_7]

Did you remove wheels for some reason during your work? Could it be a loose drive wheel? I once forgot to fully tighten my lug nuts on one wheel and it had exactly these symptoms.

 

Good luck.

[Son of Marty]

Failed u joint? tranny output flange striped? climb under there and start wiggling things and checking nuts and bolts.

[MattL]

12 hours ago, man_mark_7 said:

Did you remove wheels for some reason during your work? Could it be a loose drive wheel? I once forgot to fully tighten my lug nuts on one wheel and it had exactly these symptoms.

 

Good luck.

I have done that same thing myself, but no, that’s not it this time. The lug nuts are all on there good and tight. 
 

I will go through this checklist you guys have put together for me. Thank you much.