3.5 or 4" MMX Driveshaft

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Jeffguy11

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I just got 4.10s and a posi in my mark, and i tried to sneak away with a 93 driveshaft.... unfortunately, as i sort of assumed, i have a pretty nasty vibration. I thought that most of you guys were running the 3.5 inch dynotech shaft, but i was looking at supercoupe performance and the offer both a 3.5 and 4 inch, claiming that the 3.5 is unsafe for 3.73 and 4.10 ratios. I was just wonding what you guys thought about this, since the 4 inch is almost 100 bucks more.
 
Jeffguy11 said:
I just got 4.10s and a posi in my mark, and i tried to sneak away with a 93 driveshaft.... unfortunately, as i sort of assumed, i have a pretty nasty vibration. I thought that most of you guys were running the 3.5 inch dynotech shaft, but i was looking at supercoupe performance and the offer both a 3.5 and 4 inch, claiming that the 3.5 is unsafe for 3.73 and 4.10 ratios. I was just wonding what you guys thought about this, since the 4 inch is almost 100 bucks more.
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Told ya' you would have this problem Jeff. No one listens!LOL!

Get the Denny's 4 inch I do not like Dynotech.
 
I was looking at Denny's site and didn't see anything specific about pricing. Do roughly how much a drive shaft runs from them.
 
350 I believe. When I priced one they were 3 weeks or so behind. Give them a call for an exact quote and timeframe.
 
ONEBADMK8 said:
Told ya' you would have this problem Jeff. No one listens!LOL!

Get the Denny's 4 inch I do not like Dynotech.
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i know i know i should have listened haha.. i figured i might be able to get away with the 93 till i had more money, but i guess not
 
Dern Humpus said:
350 I believe. When I priced one they were 3 weeks or so behind. Give them a call for an exact quote and timeframe.
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$350? i was seeing like 530 shipped when i looked through the search!
anyone use the dynotech 3.5" with the 4.10's?
 
Dynotech has a crap balancer and uses a TON of weights on the shafts I saw. The Dennys is like $530.00 shipped, the JUNK stock one lists for $930.00 and so it is a deal? No comparison for the Denny's stuff. I have one of their shafts in all my Hot Rod's.
 
ONEBADMK8 said:
Dynotech has a crap balancer and uses a TON of weights on the shafts I saw. The Dennys is like $530.00 shipped, the JUNK stock one lists for $930.00 and so it is a deal? No comparison for the Denny's stuff. I have one of their shafts in all my Hot Rod's.
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stock retail anything is rediculous
 
I wouldn’t rush out and by an expensive shaft when you don’t need too, myself and several other people I know have 4.10:1 and 3.73:1 and never had any vibration with the stock shaft.

The Rinehart shaft is nice but the 400 bucks can be spent somewhere better. A stock 93 will do just as good till you really start making HP's. Do you know for sure your shaft is sh*t?

If not try indexing it on the pinion shaft, there are 8 different positions to put it in and one of them should the least amount of vibration it not any at all. It’s free so I would try it first just takes a while.

Otherwise go to www.car-part.com and get another used shaft, it might even be your u-joints too, and check the play in it to while you’re indexing it.
 
ONEBADMK8 said:
Dynotech has a crap balancer and uses a TON of weights on the shafts I saw. The Dennys is like $530.00 shipped, the JUNK stock one lists for $930.00 and so it is a deal? No comparison for the Denny's stuff. I have one of their shafts in all my Hot Rod's.
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Are you compring to the MMX shafts or the current ones? I have an MMX shaft in my car from Dynotech that I bought probably 3-1/2 years ago, and it has ONE weight on it, and it's not a very big one. Car has 4.10's, I've had it up to BIR on their road course and put over 100 miles on the car with it getting up to 120mph (Never let it get into overdrive) multiple times, vibrations here.
 
supercoupeperformance sells two dynotech driveshafts ones a 3.5 ones a 4" the question is which hasn't been answered has anyone run the 3.5 with higher gears. I know there website doesnt recommend it of course, but the question is out there.
 
Markviiiedrea said:
I wouldn’t rush out and by an expensive shaft when you don’t need too, myself and several other people I know have 4.10:1 and 3.73:1 and never had any vibration with the stock shaft.

The Rinehart shaft is nice but the 400 bucks can be spent somewhere better. A stock 93 will do just as good till you really start making HP's. Do you know for sure your shaft is sh*t?

If not try indexing it on the pinion shaft, there are 8 different positions to put it in and one of them should the least amount of vibration it not any at all. It’s free so I would try it first just takes a while.

Otherwise go to www.car-part.com and get another used shaft, it might even be your u-joints too, and check the play in it to while you’re indexing it.
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My driveshaft vibrates with stock gears.
 
PHRANQUY said:
Are you compring to the MMX shafts or the current ones? I have an MMX shaft in my car from Dynotech that I bought probably 3-1/2 years ago, and it has ONE weight on it, and it's not a very big one.
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Same here. The original MMX shafts from Dynotech were godsends.

I have heard issues with the current offerings.
 
Mine only has one as well

100_2118.jpg


100_2119.jpg
 
Heres the only weight on my Denny's shaft. See Denny's has one of only 3 balancers of the type they use in the World. It goes to 10,000 rpm's. Better balancing, less weight to balance makes a more true shaft.

dsREARYOKE.jpg
 
The word is stay with 4" if you are going to run 3:73 or taller gears because of shaft strength (stiffness), otherwise go to the 3.5" and save a few dollars.

Dynotech also has 10,000 RPM balancers, their standard is to balance to a minimum of 6,000 RPM on "Stock stuff" which is more than adequate for what we are doing with our Mark Vlll's.
 
driller said:
Are the Metal Matrix Composite Aluminum shafts available again?
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No, I called both Denny's and Dynotech, and they are not. Apparently the demand (GM and Ford) isn't there right now, so the alloy for the MMX tubing isn't being made right now.

This is why I will probably be sending my driveshaft back to dynotech for shortening.
 
They are recommending a 4" 6061 T6 shaft in place of the MMC 3.5", they claim it is almost as stiff as the old.
 
It sucks how close the MMC Vic driveshaft is in length to the mark VIII shaft, you can pick them up for around $50 used.
 
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