New clutch, truck barely moves now,

[oldblue1968chevy]

Oh, and also, with linkage disconnected, the throwout bearing is still sitting against the pressure plate teeth things..

could the TB be on backwards?

edit, My old motor was a 78-79 something like that 350

I called orielly and they said its the same part number for my 68 with a 307 (what it had stock) and the 78 or 79 chevy truck with 350

so that leaves me to believe i have the long throwout bearing and need the short one? im really lost here

[Lee H]

OK, so you ordered two kits and they both came with short TOBs? I could see one kit mispackaged but two?

[oldblue1968chevy]

No lol

I rebuilt a 72 350 4bolt main for my truck

I install it, along with flywheel and trans from my old tired motor (late 70's 350)

I decide to put new clutch 'kit' in too (stock repalcemtn from autozone, 11" clutch, throwout bearing, and pressure plate) Well, I get home and realize the TB's arent the same, I go back and he didnt have a long TB for my truck, we get one from a 70's truck with 3OTT.

Now, with the clutch linkage disconnected, the TB is still pushing on the pressure plate, (long TB, which is what came out of truck lol)

[BLACK AND BLUE 67-72]

hmmm, only leaves wrong pressure plate or wrong throw out bearing....

[raycow]

Originally Posted by oldblue1968chevy

appears that the rear of the bearing is against the trans already...

Then you have no choice. You MUST replace either the bearing or the
pressure plate. I vote for the bearing. It's cheaper and easier.

Ray

[oldblue1968chevy]

the pressure plate was the same as the old one we took off...

the kit came with short TB i swapped for long one..

[raycow]

Originally Posted by oldblue1968chevy

the pressure plate was the same as the old one we took off...

the kit came with short TB i swapped for long one..

Then you need the short bearing. Look at it this way: The combined length of the pressure plate and bearing is too much for the space available. The bearing is back as far as it can go and it is still depressing the fingers on the pressure plate. One of the pieces has to be too long.

I have no clue how your old clutch could have used the long bearing with the same pressure plate you have now. I'm betting that if you carefully compare the two pressure plates you would find a difference in the finger height.

Ray

[BLACK AND BLUE 67-72]

so you have the long one in there now?

[oldblue1968chevy]

Im going to try to get to the parts store sometime and get a short TB

I really wanted to go today (cruise in but no way to get there)..maybe dad will take me next few days...

Get short TB and drop trans, is on the list of TO Do's

long one is in there now

[68lwb292]

I agree with using the short one. There must have been just enough difference in the pressure plate (maybe a different design or company) that makes it require the shorter one. Don't feel bad cause I would have done the same thing if it was me. I would guess the original one with the kit was probably the correct one.

[geezer#99]

Originally Posted by raycow

Then you need the short bearing. Look at it this way: The combined length of the pressure plate and bearing is too much for the space available. The bearing is back as far as it can go and it is still depressing the fingers on the pressure plate. One of the pieces has to be too long.

I have no clue how your old clutch could have used the long bearing with the same pressure plate you have now. I'm betting that if you carefully compare the two pressure plates you would find a difference in the finger height.

Ray

I agree. A close examination of the pressure plate is needed. FYI there are 2 types of diaphram pressure plates. A raised finger which uses the short bearing and the flat finger which uses the longer bearing. If you put them side by side you'll see the difference. When you buy a clutch kit it comes as a set with the right bearing included. IIRC

[oldblue1968chevy]

whatchall mean by raised finger, the fingers on the pressure plate?

imma get a short TB asap, thanks guys!

[oldblue1968chevy]

Ok, the fingers appear to be 'raised' (sticking toward the back of the truck)

I got the trans off, dropped it on my finger OUCH!

Here is pic of TB!

I also, dislodged my pilot bearing which is brand new (federal mogul, says part of moog or something on box, its the brass one)

I have a silver looking one that came with the clutch kit, should I:

Put the one I knocked out back in (pretty much brand new)

Put silver one BRAND NEW back in

or buy a new brass one?

oh and should the shaft have play in it?

[Lee H]

Hang in there, your almost done, it'll be going good as new soon. Those shafts always have a little play, don't worry to much about that. I would use the bronze FM if it's not buggered up, make sure it fits the end shaft before and after install.

[Kerry P]

Originally Posted by oldblue1968chevy

Ok, the fingers appear to be 'raised' (sticking toward the back of the truck)

I got the trans off, dropped it on my finger OUCH!

Here is pic of TB!

I also, dislodged my pilot bearing which is brand new (federal mogul, says part of moog or something on box, its the brass one)

I have a silver looking one that came with the clutch kit, should I:

Put the one I knocked out back in (pretty much brand new)

Put silver one BRAND NEW back in

or buy a new brass one?

oh and should the shaft have play in it?

I've had trouble with silver pilot bushings. Wore one out in 5,000 miles. Heard from others that it is common. Use a brass colored one. Another test is to see if it reacts to a magnet, if it does I would not use it. It should be very tight in the crank. I freeze them over night before driving them into a crank. I have encountered a situation where the fit was loose. I used a center punch to dimple the mating surface of the crank. It gave enough of an interference to keep the busing in place and prevent it form spinning.

If you try this method make sure to do it in a uniform pattern inside the crank recess so the bushing is not pushed off center.

Kerry P

[oldblue1968chevy]

Ok, well long story short, (I sorta felt dumb to post this, but I didnt do it..lol)

The guy that helped me put my trans to the motor took a drill and just barely drilled in the pilot bushing...idk why, i guess cause it wasnt going in LOL

But I think imma buy a new pilot bushing (brass) while im there lol

So yall think I ought to go with the short TB (order it for my truck with 307?)

Oh, and guys, thanks a billion for helping me, if it wasnt for this board and a few other people i know, I wouldnt have this truck, it would have sold on craiglist for $200 bucks and I would be driving some kind of KIA or something from the 90's with 450,000 miles falling apart or something!

Really, thanks alot for helping me I know i ask alot of dumb ?'s and do even stupider things but im learning

[geezer#99]

Use the silver one. I have one too. Looks like harder material than bronze and will wear better. Use the one that's tight when you put it in. Yours should never of popped out. Use a socket that's the same size with an extension to drive it back in all the way. Should be about an 1/8 inch sticking out when it's all the way in. You should be able to put it back in without removing the clutch to get at it. It'll be fun but can be done. LOL!!! THe shaft should have some play in it. Put a little grease on the shaft splines too so the disc slides on it better. Just a little though. Clean any excess grease off your fingers and TB too. Clutch discs hate grease. Make sure you put tranny in 1st or reverse before putting it back in. Sometimes you need to rotate the splines a bit to get them to slide through the disc. Just turn output shaft by hand if needed. If you have a helper put your clutch linkage back together and when you're ready to slide the tranny back in have them step on the clutch gently and the tranny should slide back in easier.
Your finger don't look too bad!! I have a nice scar on my bald old head from a tranny wackin' it 25 years ago. Live and learn. Have fun!!!

[oldblue1968chevy]

So use the silver bushing (brand new in box) or try to shove the old brass one back in?

I was lookin' at my old pressure plate and the fingers lay flatter than the one currently in my truck....

So if the fingers stick out more i need the shorter TB, fingers lay flat, i need long TB?

[68lwb292]

Yes on the TB and as for the PB I would use a new one either the one you got or a new brass one just make sure it fits your shaft before you install it. good luck and be happy you don't have my granny 4 spd cause you would have lost that fingernail lol

[oldblue1968chevy]

got it short TB and brass pilot bushing thanks yall!

Ima try to take my mom out to dinner/parts store lol!

[BLACK AND BLUE 67-72]

Glad to be of help!!

[Sammy]

Lol ,hes right about the granny 4 spd..that bugger is a monster and takes two just to scoot it much less pick it up.

[68lwb292]

Yep, I thought I was gonna pull mine by myself through the floor access, not a good idea! As soon as it fell out of the clutch the shifter pinned my "junk" to the bench seat and it took every ounce of strength I had left to get it off. Because you lose a lot of strength when that happens to you (I'm sure most of you guys can back me up there). Anyways after freeing my twig and berries I ended up sticking the cherry picker through the passenger door to get the stupid thing out. Guess I'm trying to say is be glad it was only your finger! LoL!

[Shyguy]

Since you all brought up the heavy 4 speed. I remember back in late '70's my clutch went out in my '72 GMC and I decided to replace it myself, being young and dumb I took the drive shaft out, took the bolts out and slide the transmission back. I was laying underneath it, dang that thing was heavy. I was pretty strong back then and able to keep it from crushing my chest, but it sure got my attention and left a bruise, lol.

When I decided to put the transmission back in I had a friend help. It was still pretty hard with two people.

A few years later the throw-out bearing went out and I decided not to drop the transmission all the way to the ground. I took the high hump out and put a couple of 2 by 4's on the floor and ropes under the transmission. I slid it back, replaced the throw out bearing and slide the transmission back in place.

Now that I have a cherry picker I will use it if I have to work on the clutch on either of my trucks.

When we replaced the clutch in my '71 with a 454 about 3 months ago I bought a clutch kit from Auto Zone and everything worked out great.

[oldblue1968chevy]

yeah, i guess i shoulda just used the bearing that was in cluded with the clutch kit lol