corvettesforevor

So I have a 1984 corvette with the 4 speed manual, and lately it has been acting funny. The engine is running fine and its driving like normal, other than for one thing. When I shift, and then get on the gas, it will rev but it will barely accelerate, then it will lower its RPM back to where it was when i shifted, and then rev and accelerate like normal. This might sound hard to understand, but its like my clutch wasn't fully let out and it wants to move but its not fully let out so it will just rev and not move much.

But it doesnt always happen just when I shift, If i am going 30mph in 3rd gear, and give it a decent amount of gas, it will do the same thing. Step on gas, RPM up, won't pull much, RPM goes down, then start to go back up again, accellerating normally.
Can you guys get what I am saying? I don't know if its the clutch or somthing with the gears, or maybe somthing with the overdrive is gone bad, but This doesn't just happen in overdrive, it happens in the normal gears as well. My clutch grabs fine at a stop to go so I don't know what to think. Anyone have thoughts? Thank you

Paul Workman

My money is on the clutch being shot. If you are lucky, you might not have scored the flywheel and it can be re-surfaced, if necessary. Let it go any longer, and you'll be looking for a FW for sure.

ricasso

Yep, time for a new clutch..leave it too long and it will get progressively worse, to the point where it will be slipping in every gear and on take off, I've recently had a similar situation in my 94 six speed, it's now in the shop having a full stage two Carolina Clutch and steel flywheel fitted as we speak!

corvettesforevor

how much time and $$ are we talking here guys....

ovrebo1

$1500ish?

Paul Workman

I'm a DIY'er, so parts and my time was my costs.

On my 95 LT1/ZF6 Vette there is an aluminum shim plate between the bell housing and the engine block. IDK what years that shim plate was used, but I mention it b/c it is critically important that it be reinstalled, so you or whomever needs to know to use some TLC when removing the trans. And, don't forget to instal a new pilot bushing and throwout bearing, while you're at it.

dizwiz24

Ummm... Why am I the only one here that noticed the op says he has an 84 with a manual 4spd.

I thought the 84s were all automatics

Benny42

4+3 was available in '84

pologreen1

1982 was auto

pezter22

You may have to call around to find someone who is familiar with the Doug Nash 4+3. With my '84 it took me a while. It's not a transmission that many are familiar with.

After ten calls around town, I finally found someone I "thought" would do a good job. I had already purchased a Luk clutch and the place I chose charged me $450 in labor. It was a good price, but they really messed up the installation.

A year later when my overdrive unit began to fail, I purchased a Tremec and had a new trusted mechanic do the install.

Do your research.

corvettesforevor

I found this really cheap clutch kit on partsgeek.com.. It looks good to me but it has me suspicous.. its only 75$.. What do you guys think?

http://www.partsgeek.com/gbproducts/...Ms_RoCs1Lw_wcB

maddogwyatt

Just a thought, my car is an auto '93, so I don't know if the clutch is cable or hydraulically operated. If the former, there may be some adjustment left to let the clutch grip better. Like I say, just a thought.

aDigitalPhantom

Autozone sells the clutch kit/set for an 84 for $99.99.

corvettesforevor

So I got everything taken apart, the old clutch is definetly garbage. Got the new kit from autozone for 99$. My question is, the old flywheel is discolored from heat, it still looks pretty good just discolored. I was told to resurface it but my friend tells me that it is to risky to resurface the flyhweel because there is almost 0 tolerance and it will just cause me more problems. What do you guys think I should do??

aDigitalPhantom

I have not had problems with a resurface flywheel, but look for cracks before getting it resurfaced.