C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Which clutch for 4+3 ?

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Old Dec 19, 2024 | 07:54 AM
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Default Which clutch for 4+3 ?

I think I need to change a clutch in my C4 85 4+3. Car has 134kmiles and clutch operated like it was close to its end. Also I can hear some noise from clutch (bell location).
Recently I had issues with gears. Reverse was with grinding and I was unable to put any other gear. On my last short trip I was able to put only 4th, then I got 2nd. After some time 1st as well, but when I parked I lost all of them. I changed oil in gearbox (not overdrive) - previous was really bad and bleed the clutch. In result I put new clutch fluid. Now clutch works without big force and I do not feel that it is engaging. Still no gears. When I release a clutch and try to put a gear rpm goes down.
Anyway this need to be checked all together: clutch, gearbox and overdrive which leak a lot.
Do you have any clutch manufacture preference ??

I dont need any performance one, just like stock one with good reliability. PERFECTION CLUTCH MU19111 is good choice ?
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Old Dec 19, 2024 | 11:57 AM
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I haven't moved the car with it (lots of reasons) but I ordered up a LUK04080 (Daily Driver) RepSet®. I guess I got one of the last ones from Rockauto, but it is just a basic clutch kit. I have used LUK with lots of success in the past on my German cars.
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Old Dec 19, 2024 | 03:18 PM
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If your OD is leaking then make sure that is serviced to full.

Last edited by jazfe; Dec 19, 2024 at 06:49 PM. Reason: additions and subtractions
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Old Dec 20, 2024 | 06:30 AM
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Sounds to me like the clutch is not bled properly.
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Old Dec 20, 2024 | 11:11 AM
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Clutch was bled already, I also push out old fluid and added new one.
Anyway I checked slave cylinder and push-rod which push fork move less than 1cm - I think it is to small movement. Maybe it is some problem with clutch master cylinder?
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Old Dec 20, 2024 | 02:32 PM
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Originally Posted by Sherif
Clutch was bled already, I also push out old fluid and added new one.
Anyway I checked slave cylinder and push-rod which push fork move less than 1cm - I think it is to small movement. Maybe it is some problem with clutch master cylinder?
probably, my clutch master probably dies once a year or so on my car

havent found a brand that doesnt suck yet, some die in 2 months and others last a year or two
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Old Dec 31, 2024 | 09:38 AM
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ok, car is fixed and back to the road .
Problem was with clutch master cylinder. It looks that it was dying and clutch worked on very short range. Thats why I had problems with gears and finall blocked all of them.
Now works very well, there's even a "click" when gear is on.

Anyway I have some doubts:
- does clutch pedal has any adjustment ? After new pump wast installed it is ca 3/8" higher then brake's pedal
- in order to bleed I have removed clutch actuator/slave and removed pushrod which push clutch fork .. unfortunately I forgot where is proper end. One end of pushrod is sharpened second is wider and spherical. I have install thinner, sharpened end towards clutch fork - is it correct ?
- still I have squeak when I push clutch pedal, noise is coming from clutch bell - can i somehow put some grease inside from folk side ?
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