On my 87 XLT, I have a 4sp manual (tranny code is 19 on the sticker) and it makes this slight grinding or whining sound which becomes totally silent once the clutch pedal is pushed down to the floor. It also has a loud click when the pedal is rising up from the floor and is fairly hard to shift into gears. Not long ago I just had a slave cylinder explode on me leaving the pedal stock to the floor. The slave cylinder and clip was replaced and wondering if the shop shouldve noticed and made repairs to these problems mentioned above while they did the slave cylinder and clip repairs. Does it sound like these noises may cause another failure of the slave cylinder again? Thanks in advance.

 

Ops, I made a mistake in my original post. My trans code is "B". I believe that is the NP435 I think. If anyone knows what I should check or replace to eliminate the above problems, I would be greatly appreciative, thanks.

 

You might check fluid level in the tranny. I also have a 87 with the same codes as you. That cured my whinning sound. Cant say about shifting and clunk noise however. What I can tell you for sure is it isnt a NP435 tranny with those codes.

 

Thanks. I did check the fluid level and its good. Anyone know the answers to my other questions? Thanks in advance.

 

Anyone else?

 

Am I in the *Transmission* forumn, or am I lost?? Just kidding. Anyone able to offer even the slightest help or suggestions? It would be very appreciated...

 

TTT

 

I tried to post before, but got rejected. Ok, it's probably a pocket bearing noise. Does it make the noise in all gears except direct (fourth?), and if you are rolling down the road and hit the clutch, does it go away? If it still makes noise with the clutch in, then it is a pocket bearing noise. If the sound rises and falls with changes in throttle (ie. louder when you get on it), it may be a countershaft bearing. Either way, you ought to do a semi-rebuild on it.

Jared

 

Thanks for the response Jared. Its hard to tell while I am driving because of all the additional rotating noices, tires, etc. But just being parked and in neutral, it sounds like perfectly normal idle sounds coming from the truck. Its only when I push in the clutch (no gear change, just pushing down clutch pedal) that what I thought was normal idling sounds, becomes much quieter with the clutch in. Naturaly the rpm's arent dropping as I am just pushing in the clutch pedal, so it seems to me that something is rotating with the clutch during normal idling, and then stops or disengages (??)once the clutch is pushed in. Any help GREATLY appreciated, thanks.

 

 

When the clutch is released and the engine is running there IS somenthing turning in the transmission. At least the input shaft, and probably the gears meshed with it. If you are in neutral, then none of the gear clusters make a connection between the input and output shafts, therefore no power transfer OUT of the trans.

There is a pocket at the posterior end of the input shaft into which goes a set of needles (making it a needle bearing), the output shaft has a section that goes into this pocket. I guess its a "pocket bearing" I never knew what it was called.

The bearing in the pocket keeps the two shafts perfectly aligned (in fact, it looks like one shaft) so that the input shaft and output shaft are free to turn at differenct speeds depending on the gear you are in. The gears link the shafts. When you are in high gear you are in a 1:1 ratio, i.e. the shafts turn perfectly together. No noise from the bearing. In OD (like my SROD) the output shaft turns a little faster than the input, in 1 and 2, output shaft turns a little (or a lot) slower -- hence mechanical advantage via gearing.

The part of the output shaft that fits into the pocket has a hardened surface -- thats what my problem was, the surface became rough. So any gear except 3rd screamed like crazy. Pushing in the clutch stopped the noise (input shaft no longer turning); if you get noise when pedal is depressed, then it is likely throwout bearing.

Good luck.