the single mass really shouldn't be called an upgrade

 

Have you ever had a single mass flywheel? Drive one and you will see that it is better. Much easyer to push the clutch, and no two piece crap to wear out. The last dual mass I had was in my stroke, and when it went bad it cracked the bell on the tranny, resulting in a different tranny install. The dual mass might have came from the factory, but it is not better in my opinion. I have installed 5 single mass conversions on 5 different trucks, and NO problems with any of them. Check the OBS stroke forum and see what they say about the dual mass flywheel. Sorry for the rant, but that two piece of crap is one of my pet peeves.

 

you cannot deny that a single mass flywheel will kill the ZF5 transmission in time.... cheaper does not mean better yes single mass is easier on ur wallet if you plan on driving the truck and then selling it to let someone else deal with the problems.....

i went through here and ask which would be better when i replace my clutch and the majority of the responses i got were

SINGLE MASS IS CHEAPER AND WILL WORK BUT WILL AT SOME POINT DESTROY THE TRANSMISSION DUE TO TORQUE SPIKE TRANSFER THAT THE DUAL MASS FLYWHEEL CLUTCH WAS DESIGNED TO ABSORB. IT MAY TAKE YEARS BUT IT WILL EVENTUALLY REQUIRE TRANSMISSION REPLACEMENT. AND AS LONG AS SINGLE MASS FLYWHEELS ARE USED THE TRANSMISSIONS WILL STILL BE DESTROYED BY TORQUE SPIKE TRANSFER.

i plan on keeping my truck for as long as possible i built my truck and i will take care of her as best i can, and that means using the clutch setup that will protect my transmission the best.

i have no problems pushing my clutch and ive never had a problem pushing the clutch.... ive never got in the truck and thought huh i need less clutch pressure....

plus i like to hear my engine while driving and not gear rollover noise. i have driven single mass flywheel trucks before and i don't like the noise they make and one of the ones ive drove i could push the clutch with my finger it grabbed and released good and drove just fine but it had almost no resistance on the pedal it felt like i was gonna put the pedal through the floor.

everyone has their own opinion but the dual mass flywheel is all around better for the truck even though it does cost more but figure ive gone 240,000 miles on mine if i replaced it today and got the same life out of the second one i would be up to 480,000 and had a clutch investment at 800$ dollars thats much cheaper than a conversion and a transmission at 2000$ there is no way to tell when a transmission will fail with a single mass but why chance it? farmert is the first ive heard to have a clutch failure result in a cracked bellhousing. usually you can tell long before it grenades that the clutch is going out...............

 

It wasn't a clutch failure that cracked the tranny it was a dual mass fly wheel failure that broke it. The super duty's run a single mass fly wheel,altho granted it is a ZF6, made by the same company, and over the road tractors don't have a dual mass fly wheel, and they log hundrends of thousand miles on those trannys before rebuilds. My 90 just rolled over to 200K and about 50K is with the conversion. The tranny operates like new. It could go out tomorrow, but it could also do the same if it had the dual mass.

 

the ZF6 was designed for single mass same as the t18-19 but the ZF5 was designed for dual mass and over the road tractor trailers only use the clutch to get rolling

 

Well I only use my clutch when taking off or downshifting and sometimes isnt needed for downshifting. It changes gears very easily. I hit around 12-15 hundred rpm and left of the fuel and she pulls right out and goes right into the next gear. When my dual mass went out I was 140 miles from home. I made it just fine once I got rolling, I rarely ever use my clutch.