Is the M6 the weak point?
Thread Starter
TECH Fanatic
Joined: Dec 2001
Posts: 1,220
Likes: 0
From: Germantown, MD
Is the M6 the weak point? OK so this season money is a little tight and modding is not in the cards(trying to buy new house). But next season I'd like to get a new rear. Not sure if I'm going 12 botl or 9 inch just yet but my concern is the Tranny. I know the T-56 is a great unit and so far I have found nothing wrong with it. But if I get a bullet proof rear will the tranny be the weak point in the drivetrain? What are your thoughts? How much can the T-56 handle? What are alternatives if I'm pushing out more than the T-56 can handle? Will a McLeod single Kevlar disk ever be able to grab tighter than the tranny can handle?
I know this is a lot of stuff, but I'm curious and guys on this board seem so knowledgable. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Mike
I know this is a lot of stuff, but I'm curious and guys on this board seem so knowledgable. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Mike
Re: Is the M6 the weak point? The viper T56 is not the same. Output and input shaft diameters differ. That's the weak point of the trans really. 1st gear can be.
With a stout rear and good clutch I'd be more woried about the stock aluminum drive shaft <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I just had my T56 rebuilt with stock parts. It was whining louder than my rear, but it still shifted ok <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
this is what my drives shaft did <img border="0" alt="[Fluffy]" title="" src="graemlins/fluffy.gif" />
http://harlan-engineering.com/ds/Dsc00649.jpg
With a stout rear and good clutch I'd be more woried about the stock aluminum drive shaft <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I just had my T56 rebuilt with stock parts. It was whining louder than my rear, but it still shifted ok <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
this is what my drives shaft did <img border="0" alt="[Fluffy]" title="" src="graemlins/fluffy.gif" />
http://harlan-engineering.com/ds/Dsc00649.jpg
Re: Is the M6 the weak point? Just going through yet another tranny.
If you are worried about the T-56 replace all the syncro and the 3rd/4th gear shift fork with some new parts. According to D D Peformance (one of the better tranny shops that deal with the T-56) starting with the 2002 the syncros were made of kevlar - much stronger than stock 2001 and prior. Buy an steel shift fork. Go to www.ddperformance.com
David
If you are worried about the T-56 replace all the syncro and the 3rd/4th gear shift fork with some new parts. According to D D Peformance (one of the better tranny shops that deal with the T-56) starting with the 2002 the syncros were made of kevlar - much stronger than stock 2001 and prior. Buy an steel shift fork. Go to www.ddperformance.com
David
Re: Is the M6 the weak point? I just went through my tranny too. I fragged second gear. I tried to get a steel shift fork from D&D but they didn't have any, and said they had a bunch on backorder. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> I did get new synchros, a new 2nd gear, and a new 1-2 slider gear (the parts I broke <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> ).
I have a Cartek clutch, Denny's NR shaft, and Moser 12-bolt. I don't worry about those parts. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Now I'm worried about my stock torque arm. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
-Andrew
I have a Cartek clutch, Denny's NR shaft, and Moser 12-bolt. I don't worry about those parts. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Now I'm worried about my stock torque arm. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
-Andrew
Re: Is the M6 the weak point? 6-speed drivetrain weak points, in order:
1. Stock piece of **** rearend
2. Stock clutch
3. Stock aluminum driveshaft
4. T56
I haven't busted #4 yet, but I promise I will. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Tony
1. Stock piece of **** rearend
2. Stock clutch
3. Stock aluminum driveshaft
4. T56
I haven't busted #4 yet, but I promise I will. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Tony
Teching In
Joined: Jul 2002
Posts: 14
Likes: 0
From: IL
Re: Is the M6 the weak point? Has anyone ever have Liberty pro-shift the m6 like the 5.0 people did with the t5's? From what I have heard the pro-shifted t5's were pretty strong and would hold up to 10 second runs with a 3000 pound mustang. The weak point was the input shaft. They would usually be the first to break.
The t56 is much stouter than the t5's. A proshifted one should hold up to alot of abuse. (For those of you who dont know about liberty's proshift mod, what they do is mod the synchros to allow for much quicker upshifts making it easier to powershift.) The only drawback is noise and it cant be downshifted normally. You must heel and toe to downshift. Something that should be done anyway to reduce wear on the synchros. Not mention it falls into gear much easily this way.
The t56 is much stouter than the t5's. A proshifted one should hold up to alot of abuse. (For those of you who dont know about liberty's proshift mod, what they do is mod the synchros to allow for much quicker upshifts making it easier to powershift.) The only drawback is noise and it cant be downshifted normally. You must heel and toe to downshift. Something that should be done anyway to reduce wear on the synchros. Not mention it falls into gear much easily this way.
Trending Topics
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: Is the M6 the weak point? I think the weak point of the T-56 is going to be the torque arm mount on the tail end of it. Hopefully you get a different torque arm to move those stresses elsewhere off the driveline.
Second, the driveshaft is a big piece of crap. Harlan's looks pretty cool all twisted like that. Mine actually twisted and exploded into 4 pieces. Take a look: http://www.sigma-epsilon.org/steve/m...haft/index.htm
I've already ate all the gear teeth off the stock posi unit in the 10 bolt (that was pretty cool to see, WTF!). About 30 teeth came out of the housing in the oil and the gears no longer will even mesh. I also replaced my clutch. And the 12 bolt is on the way. I too will be finding out if the T56 will hold up to the abuse here very shortly. I've removed all of the weak points in the driveline, so that's the only thing left for me to break.
Second, the driveshaft is a big piece of crap. Harlan's looks pretty cool all twisted like that. Mine actually twisted and exploded into 4 pieces. Take a look: http://www.sigma-epsilon.org/steve/m...haft/index.htm
I've already ate all the gear teeth off the stock posi unit in the 10 bolt (that was pretty cool to see, WTF!). About 30 teeth came out of the housing in the oil and the gears no longer will even mesh. I also replaced my clutch. And the 12 bolt is on the way. I too will be finding out if the T56 will hold up to the abuse here very shortly. I've removed all of the weak points in the driveline, so that's the only thing left for me to break.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
TECH Apprentice
Joined: Apr 2002
Posts: 373
Likes: 0
From: Hickory, NC
Re: Is the M6 the weak point? For high hp applications, the ACPT carbon fiber driveshaft is the only way to go. I spoke with Jim Leslie (president of ACPT) and their supplying DS' to drag racers with 800+ hp to the rear wheels. They make one for F-body's and it's a little pricey but it won't break.
Just ask Nineball, he know all about twisted coke cans! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Just ask Nineball, he know all about twisted coke cans! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
