Does the Mark VIII Driveshaft Work?? - TCCoA Forums
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post #1 of 32 (permalink) Old 11-27-2002, 02:33 PM Thread Starter
 
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Does the Mark VIII Driveshaft Work??

i have 3.73 and i get a bad vibration at about 80 or so. if i switch to the aluminum drive shaft is this going to help my vibration problem? does anyone have the mark vIII dirveshaft? how does it work? Can i just balance my steel stock shaft?
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post #2 of 32 (permalink) Old 11-27-2002, 03:50 PM
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find the 93 mk8 driveshaft...its a one-piece shaft...it works...it should reduce the vibration
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post #3 of 32 (permalink) Old 11-27-2002, 04:27 PM Thread Starter
 
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well i found a 93 driveshaft from the mark VIII is it going to reduce the vibration or get rid of it? i was told today by a "drive shaft mechanic" that the mark vIII shaft will not help and i need to have my stock shaft balanced? if the mark 8 shaft does vibrate, what speed does it do it at?
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post #4 of 32 (permalink) Old 11-27-2002, 04:56 PM
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Question You can balance a stock drivehaft but why?

They arent all that great to begin with.They are thin steel ones compared to a thick aluminium one.I am almost positive that a Mark VIII driveshaft will cure your problems.I had my Mark VIII up to 130 with the stock driveshaft and it was still smooth.That is what the speed limiter is rated at anyways.The T-Bird/Cougar will shut down at 105 or near that.

Dont waste your money getting the stock one balanced if you have access to a Mark one.I really never heard of a drive shaft mechanic anyway.Call Dennys Driveshfts or Dennis and he will also tell you that you are wasting your money by getting the stock one balanced.

Hope this helps you out and doesnt offend you,Good Luck,
Chris

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post #5 of 32 (permalink) Old 11-27-2002, 07:44 PM Thread Starter
 
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thanks!

i orderd the mark VIII one today for 100$, i wasnt planing on having the stock one balanced i just hope i can hit at least 100 in my tbird with the new shaft. anybody out there with a mark shaft in a tbird with 3.73's id love to hear your input.
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post #6 of 32 (permalink) Old 11-27-2002, 08:42 PM
 
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Re: thanks!

Quote:
Originally posted by PurpleBird
i orderd the mark VIII one today for 100$, i wasnt planing on having the stock one balanced i just hope i can hit at least 100 in my tbird with the new shaft. anybody out there with a mark shaft in a tbird with 3.73's id love to hear your input.
Where did you order it for $100?
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post #7 of 32 (permalink) Old 11-27-2002, 11:12 PM
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i am also looking to get a drive shaft for mine and i know that the 93 mark dshaft is
one piece but if i wont be able to get a 93 drive shaft should i just go with 94-98
caz mine viberates at about 80 also and it doest do it as much at 100 and then
i go up to 120 and its not as bad as it is at 80

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post #8 of 32 (permalink) Old 11-27-2002, 11:25 PM
 
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Denny's Driveshafts: http://www.dennysdriveshaft.com/html/hd_aluminum.html

Carbon fiber Driveshafts: http://www.acpt.com/driveshaft/index.html


Drivetrain:http://www.drivetrainspecialists.com/

this company makes custoemr halfshafts as well:http://www.driveshaftshop.com/


http://www.4xshaft.com/

This should be of some reference to everyone and yourself regarding drivetrain parts etc.

Hope this helps.

Sincerely,
RTO
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post #9 of 32 (permalink) Old 11-28-2002, 01:50 AM
 
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dont forget reinhardt... he makes em too. -greg
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post #10 of 32 (permalink) Old 11-28-2002, 07:33 AM
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Suggestion

Quote:
Originally posted by PurpleBird
i have 3.73 and i get a bad vibration at about 80 or so. if i switch to the aluminum drive shaft is this going to help my vibration problem? does anyone have the mark vIII dirveshaft? how does it work? Can i just balance my steel stock shaft?
If you have a vibration you need to solve it before adding a new variable. I put in a new pumpkin, new drive shaft and new T/C right after I put on my old snow tires and now there is a vibration that starts at 80 mph. We think we narrowed it down to the the tires but not certain yet. To my knowledge the vibes were not there with the old equipment at least up to 95 but the snows were not on at that time.

If you can do one thing at a time.

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post #11 of 32 (permalink) Old 11-28-2002, 08:24 AM
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He sells them............

Quote:
Originally posted by glowing escape
dont forget reinhardt... he makes em too. -greg
He doesnt make them.
Chris

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post #12 of 32 (permalink) Old 11-28-2002, 01:06 PM
 
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he sells them at least... hes quoted me on a driveshaft. -greg
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post #13 of 32 (permalink) Old 11-28-2002, 06:23 PM Thread Starter
 
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yes dennis sells them but there like 400$. i got this shaft from a junkyard in south jersey for 100 bucks, i still want to know if anyone out there has the mark 8 shaft in their car and does it help. i have new tires new trans new TC and a new pumpkin and new u-joints. so im pretty sure the only other thing it could be is the drive shaft since thats what it says in jerry's trans articles. my vibration comes in at about 83 mph and in the trans article it says 86 so i think it is this steel one that is vibrating. i just want some input from someone who has the same setup as me, im hoping i can do atleast 100 without a vibration, cause i got to drive back down to south carolina this weekend and the trip is very long at only 80 mph. thanks
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post #14 of 32 (permalink) Old 11-28-2002, 06:27 PM
 
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when i get a new one, im opting for a dennis one because im going to have a either a t-3550 or a t-45 (depending which motor i go with), and they are a different length than our transmissions, so i need a different length shaft. and why not go with a really nice brandnew aluminum one perfectly balanced? anyways, i can take my car WAY over 100 without and shakes or vibrations or wierd noises, and its a stock 90 3.8. it rides really solid way over 100 and it has 146,000 miles on the clock. -greg
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post #15 of 32 (permalink) Old 11-28-2002, 06:41 PM Thread Starter
 
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who has 3.73 v8 with a mark 8 shaft does anyone. it is recomended all the time so i would think someone has it. i just want to know when it will start to vibrate with this setup? thanks.
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post #16 of 32 (permalink) Old 11-29-2002, 06:41 AM
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Quote:
Originally posted by PurpleBird
who has 3.73 v8 with a mark 8 shaft does anyone. it is recomended all the time so i would think someone has it. i just want to know when it will start to vibrate with this setup? thanks.
Dan Ulrich had one in his '96.It still vibrated.Even after sending it out for rebalancing, it had a vibration. On your '95 it might also be the output shaft runout that is contributing to the vibration as well. The OE driveshaft is a POS,and the MK8 is not much better.For what you're gonna spend getting that MK8 shaft right,you could have bought the Dynotech from Dennis,and never touched it.
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post #17 of 32 (permalink) Old 11-29-2002, 07:14 PM
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Question Why then............

If a Mark VIII shaft isnt much better then a stock driveshaft,then why does everyone want one?And why is the speed limiter set at 130 in a Mark VIII and only 108 in a T-Bird/Cougar?I think a Mark VIII shaft would be a good investment over a stock one but not as good as a Dennys or MMC that Dennis sells.
Chris

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post #18 of 32 (permalink) Old 11-29-2002, 07:19 PM
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Re: Why then............

Quote:
Originally posted by LX-Tasy
If a Mark VIII shaft isnt much better then a stock driveshaft,then why does everyone want one?And why is the speed limiter set at 130 in a Mark VIII and only 108 in a T-Bird/Cougar?I think a Mark VIII shaft would be a good investment over a stock one but not as good as a Dennys or MMC that Dennis sells.
Chris
We've been over this **** before.The MK8's speed limiter is at 130 because of the slightly better driveshaft,and the tall 3.08 and 3.27 gears that come in those cars. Put a set of 3.73's in one,and you have an instant vibrate-o-matic. I've had my T-bird with 3.27's and the stock shaft up to 130ish, and it wasn't that bad,but it was rather worrisome from the vibration that was starting to buildup. The MK8 is not an alternative to the MMC shaft if you intend to use steeper gears.
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post #19 of 32 (permalink) Old 11-29-2002, 07:26 PM
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Re: Re: Why then............

Quote:
Originally posted by Johnny Langton

We've been over this **** before.The MK8's speed limiter is at 130 because of the slightly better driveshaft,and the tall 3.08 and 3.27 gears that come in those cars. Put a set of 3.73's in one,and you have an instant vibrate-o-matic. I've had my T-bird with 3.27's and the stock shaft up to 130ish, and it wasn't that bad,but it was rather worrisome from the vibration that was starting to buildup. The MK8 is not an alternative to the MMC shaft if you intend to use steeper gears.
JL
Yeah,I see what you are saying about the steeper gears with the Mark VIII shaft.I know tha we have been over this **** before but I know there are guys out there with Mark VIII shafts and 3:73s with no problem,and you said so yourself that you hit 130 in a stock shaft,now wouldnt a Mark shaft be safer?

I am not trying to start an arguement with you JL ,I am just trying to help this guy out by not getting a stock shaft balanced and getting something better then what he has now.

Thanks,
Chris

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post #20 of 32 (permalink) Old 11-30-2002, 04:40 AM
 
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Also, couldn't an off pinion angle result in high speed shuddering also? I was thinking of getting a MK8 drive shaft also, but I can't find any in the junkyards around here.
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post #21 of 32 (permalink) Old 11-30-2002, 09:09 AM
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Yes,Pinion angle has alot to do with driveline resonance.And yes,I did have my car up to 130 with the OE shaft,but in the process,I ruined the tailhousing bushing,and after that run,it would vibrate like hell above 65mph.
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post #22 of 32 (permalink) Old 11-30-2002, 03:30 PM
 
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Gotta love when my car comes with that piece stock! 1 less thing to worry about!
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post #23 of 32 (permalink) Old 12-02-2002, 01:57 AM
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well

I have a completely stock driveline, save the Valve body modification and I have had my baby WELL over 130 infact my needle was almost touching the little pin that it rests on at 0 and I am happy to say that I have NO NONE 0 vibration at any speed, only vibe i have is from braking from that fast. Anywho, Maybe my Jenny is a freak of nature or something but she has always rode smooth.


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post #24 of 32 (permalink) Old 12-03-2002, 12:37 AM
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Quote:
I ruined the tailhousing bushing,and after that run,it would vibrate like hell above 65mph
Which is a good point in itself. If your car already vibrates that bad at 80 (and we assume it's coming from the driveline) there's a good chance your tailshaft bushing is shot anyway, and even if your new driveshaft is laser-balanced and made of alien technology, it's going to vibrate 'cause of that stupid bushing...

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post #25 of 32 (permalink) Old 09-11-2007, 01:31 AM
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So lets get some link of consensus on this point. MK8 93 drive and 3.27 trac lok are fine? Or not really that good? Is 3.55s an option? Sorry to butt in but this thread is informative and I just like to know the opinions more clearly.

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post #26 of 32 (permalink) Old 09-11-2007, 07:15 AM
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Its hit and miss. I put a 1 piece 93 MK shaft in mine with a 3.73 rear end and have 0 vibration to well over 100. Others have had different experiences.

But, the transmission in my car was built and the bushing in the tailshaft housing was replaced. I think that is important to do if there has been a vibration for any time at all. Like mentioned above, if the bushing is loose and causing a vibration then no amount of driveshaft will cure it.

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post #27 of 32 (permalink) Old 09-11-2007, 10:29 AM
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Quote:
Originally Posted by HotRod88LSC View Post
I have a completely stock driveline, save the Valve body modification and I have had my baby WELL over 130 infact my needle was almost touching the little pin that it rests on at 0 and I am happy to say that I have NO NONE 0 vibration at any speed, only vibe i have is from braking from that fast. Anywho, Maybe my Jenny is a freak of nature or something but she has always rode smooth.


Mike
Judging by your sig, i see that you are in a Fox body car. We are speaking of Vibration probs with the Mn-12/FN-10 cars (89-97 Birds/Cougs) (93-97 MarkVIII's)

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post #28 of 32 (permalink) Old 09-11-2007, 01:14 PM
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No serious vibration yet but I'm just thinking preventively. Can anyone say 3.55s are an option with a stock trans and MK8 93 drive shaft?

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post #29 of 32 (permalink) Old 09-11-2007, 01:27 PM
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I just realized how old this Thread is.

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post #30 of 32 (permalink) Old 09-11-2007, 08:22 PM
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me too wow this is old aZZ news. Goes to show how little I know.

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