ok i have a 1990 7.3 idi 5 speed with a dual mass flywheel i am putting in a new used engine and am trying to decide if i want to re use the old dual mass get a new one or use a single which i allready have has anyone had a bad expierience with the singles before ive herd there harder on the tranny and noisy?

 

if you can afford the dual mass go with it. ive been told the same.... there noisy and hard on the trans. i believe the dual mass absorbs shock from the engine and keeps the trans in tact. advance auto parts sells the dual mass kit for 700 while everyone else sells at 1000. when it comes time for my clutch thats where ill be going. im staying dual mass i want my truck another 40 years.......

 

I would go with the single mass. I have converted 5 trucks over to them with no problems. I get a little gear roll over noise when idleing around the pastures in low gear, but that is it. When the dual mass in my 97 stroke went bad it cracked the bell on the tranny resulting in a swap from a parts truck I had to purchase. In my opinion that dual mass was one of the worst ideas ever come up with.

 

My vote is for SMF. The DMF is going out in my truck with only 134k on the clock. The clutch is still strong which burns my biscuits since I now have to replace a perfectly good clutch because some engineers got bored and made something thats stupid simple into something complicated. I will be getting a south bend SMF kit sometime this winter.

 

I made the conversion to SMF about a year ago. I wish I had kept the DMF. Gear roll over is horrible, I can only imagine what it's doing to my gears.
It's really bad at low speeds/ low rpm. At Idle with the clutch out it sounds like a cement mixer full of marbles.

 

well 700 is still pretty steep do the 460's have dm also or is it strictly diesel? all the springs and nylon connectors look ok im considering reuseing my old one for 700 i only paid 500 for the used engine im puting in it

 

Advance Auto Parts: New Clutch Set with New Dual-Mass Flywheel by Perfection - Part MU3000-1DK

well anyone on here will tell you the single mass conversion works. but..... it beats the transmission to death. i went through the same situation your going through when i learned about the dual/single mass flywheel. and thats exactly what i was told "single mass works but beats up your transmission" the transmission may work for several years but it won't last as long as it would with the dual mass because it absorbs the shock from the engine keeping it out of your transmission. i dont know anything about 460s but i know the diesel bellhousing is different than gassers but i don't know if that makes a difference on the clutch. the only gassers i mess with are new ones and my brothers and its automatic. but i like the dual mass in mine i figured out what my popping noise was and it was a piece of dirt or small rock got stuck on the pivot point of the clutch fork so now no more problems there...... my truck has 238,000 on it we took the cover off and inspected it and its still got a bit of life left in it not sure if its original or not but it very well could be as it was retired to farm service by the PO due to bad glow plugs and air intrusion. yea 700-800 dollars for a clutch is high but when a single mass conversion kit is 500-600 ill spend the extra money on a clutch rather than 1500 for a rebuilt trans.

 

460's use single mass, it is a diesel only thing.

 

At least you can also tell when I DMF is on it's way out. It'll start knocking really loud when you shut the engine off in neutral and clutch out.

Mine has been knocking really loudlly for a couple years now...... but it does have 568km (377k) miles on it.

Clutch is original and feels perfectlly fine!

 

ok so im going single mass my dm had 4 broken springs of 6 for the most part my research says the newer 12 in clutch has springs in the clutch and will work ok the first generation ones were hard on the trans still at 320 for a sm its pricey but much better than 700

 

All clutch discs for a single mass flywheel have springs in them.

 

And Ford decided it was still not enough damping to protect the trans. Saving 300 on a clutch kit means you have to go through 4 or more before you save what a trans costs and it's unlikely the trans will last that long. On top of that, if the clutch kills your trans and you have to replace it, you'll then still have to buy that $800 clutch or wait to loose your rebuilt trans. I'm not saying Ford or any other manufacturer doesn't make mistakes, but they had to pay a premium to put that clutch in too. In the world of 'make it cheap' to sell a vehicle, they may have truly done the math on the dual mass.
Since I do things to my IDI that others consider riskier, I say do what makes you sleep well!!! But, reconsider the clutch one more time.

 

Justin post up when you get it done and let us know how you like it.

 

couldn't agree more.....