1972 Chevelle 454. 4 speed with a 2.56 to 1 first gear and about a 3.30 rear. The motor is basically stock with the exception of headers and a low end RV type roller cam. This was one of those forever projects that lasted about 2 years. I put a Mcloud dual disc clutch in not because I needed to hold 800 horses. What I was looking for was a lighter clutch pedal and the dual disc was supposed to help lighten the pedal. I used a Mcloud Hydraulic throw out bearing. A Mcloud Flywheel and the Mcloud RST clutch. I have read the the clutch needs about 500 pedal cycles before it’s broken in. This clutch chatters so bad l feel like the engine is going to jump out of the car. I’m not being dramatic. This thing is almost undriveable. It’s kind of embarrassing taking off from a light or driving through a parking lot with the whole car shaking. It also does it in reverse. Mcloud says this is normal and there is nothing they can do anyway. It’s out of warranty. Mclouds few suggestions were to try starting off in second or letting the clutch out faster. I do get less chatter when I let the pedal up more quickly but then I end up unintentionally spinning the wheels taking off from lights. Mcloud also suggested I may want to remove the flywheel and have it resurfaced with a coarser pattern. This is not a race car. It’s a cruiser. That’s why I used a RV type cam to give me that grunt torqe. I can be at 1200 rpm in 4th gear and it will accelerate like a bull. I always used to drive in that 1500-2000 rpm range. Now if I am in that rpm range and even slightly accelerate there is a loud vibration. It happens in 3rd and 4th speeds. One bright side is that the clutch pedal is lighter. Any one else use a set up like this and have any problems? They said I may want to remove the flywheel and have it resurfaced with a coarser pattern
Mcloud RST dual disc
Boc
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77 Posts
1972 Chevelle 454. 4 speed with a 2.56 to 1 first gear and about a 3.30 rear. The motor is basically stock with the exception of headers and a low end RV type roller cam. This was one of those forever projects that lasted about 2 years. I put a Mcloud dual disc clutch in not because I needed to hold 800 horses. What I was looking for was a lighter clutch pedal and the dual disc was supposed to help lighten the pedal. I used a Mcloud Hydraulic throw out bearing. A Mcloud Flywheel and the Mcloud RST clutch. I have read the the clutch needs about 500 pedal cycles before it’s broken in. This clutch chatters so bad l feel like the engine is going to jump out of the car. I’m not being dramatic. This thing is almost undriveable. It’s kind of embarrassing taking off from a light or driving through a parking lot with the whole car shaking. It also does it in reverse. Mcloud says this is normal and there is nothing they can do anyway. It’s out of warranty. Mclouds few suggestions were to try starting off in second or letting the clutch out faster. I do get less chatter when I let the pedal up more quickly but then I end up unintentionally spinning the wheels taking off from lights. Mcloud also suggested I may want to remove the flywheel and have it resurfaced with a coarser pattern. This is not a race car. It’s a cruiser. That’s why I used a RV type cam to give me that grunt torqe. I can be at 1200 rpm in 4th gear and it will accelerate like a bull. I always used to drive in that 1500-2000 rpm range. Now if I am in that rpm range and even slightly accelerate there is a loud vibration. It happens in 3rd and 4th speeds. One bright side is that the clutch pedal is lighter. Any one else use a set up like this and have any problems? They said I may want to remove the flywheel and have it resurfaced with a coarser pattern
Joined
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77 Posts
I will check the mounts. Could be. It feels like I didn’t put any engine or Transmision bolts in it. Would it need both mounts to be broken or not tight if does it in forward and reverse. It feels like there are solid mounts in it. Either way I will check the mounts.
1967 SS-396 427 BBC, 5-speed LGT700 3.73 12 bolt rear.
Joined
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1,719 Posts
Im running an RXT and I love it! Smooth near effortless clutch travel. I’m only putting out 535hp and 534 lt/lbs so I’m well under the maximum the RXT can handle. I purchased mine slightly used. I’m not experiencing any of the issues you describe.
Excessive chatter normally can be attributed to hot spots on the flywheel or clutch surface. Are you running a steel or aluminum flywheel?
Joe
Excessive chatter normally can be attributed to hot spots on the flywheel or clutch surface. Are you running a steel or aluminum flywheel?
Joe
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1,854 Posts
Too bad your McLeod vendor didn't disclose the twin disc rpm window and gear rattle noise.
I tell everyone that wants an RXT or RST that these clutches love to run above 2000-2200 rpm cruising.
I bet your transmission sounds like it has marbles inside it at the 1500-2000rpm window?
The solid hub discs of the RXT and RST do this and there is no fix but to stay out of the 1500-2200rpm window.
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