What Tranny and why?
#1475650
07/29/13 12:27 AM
07/29/13 12:27 AM
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Joined: Sep 2005
Posts: 1,328 St. Louis, MO
mopardamo
OP
pro stock
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OP
pro stock
Joined: Sep 2005
Posts: 1,328
St. Louis, MO
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Ok, lets talk about performance street driving with a tranny that has OD capability. Would like it to perform at the road coarse and drag strip too. Needs to handle 700 HP launches on slicks and shift smooth at 6500 R's. Thinking stick but an automatic could do it as well but there is that weight penalty. I'm concerned about weight but more concerned about having fun reliably. Modifying my e body tunnel is not an issue.
Damon
Last edited by mopardamo; 07/29/13 10:45 AM.
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Re: What Tranny and why?
[Re: mopardamo]
#1475651
07/29/13 03:59 AM
07/29/13 03:59 AM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
master
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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Choices are many but I think a T56 Magnum or a 727 with a gear vendors on the back would be my picks. I love my Viper T56 but I cannot confirm nor deny its ability for a 6500 rpm shift, yet.
Mopar to the bone!!!
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Re: What Tranny and why?
[Re: mopardamo]
#1475654
07/29/13 05:10 PM
07/29/13 05:10 PM
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Joined: May 2007
Posts: 553 Sac, CA, USA
ntstlgl1970
mopar
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mopar
Joined: May 2007
Posts: 553
Sac, CA, USA
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I'll second the T56, though 700 HP and slicks may kill it after a while. The GM bellhousing pattern opens up more options. 6L80 or whatever the strong auto trans is could be an option. If using the 6 speed, make sure you can really use the 6th gear (especially if it's one of the .50 overdrive models). Tire height, rear gear, cam selection and so on can make 6th almost unuseable in a lot of cars because 6th drops the RPM and lugs the engine so hard.
I have 3.91s in my car with a 26" tall tire. With the cam in my 440, it doesn't "clean up" until about 1900 RPM. So if I lock the converter (47RE) any speed lower than 2000, it's not happy. Pretty much I have the converter unlocked until about 50-55mph. That's with a .69 overdrive. With a .50 overdrive I doubt I could cruise with the converter locked up until about 75-80mph. In my car, a 6 speed would be a waste of money unless I changed the cam out to something that has a wider powerband or a shorter tire or 4.56's.
Just something to think about...
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Re: What Tranny and why?
[Re: RylisPro]
#1475656
07/29/13 08:51 PM
07/29/13 08:51 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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master
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Nebraska
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The Magnum is rated for 700 ft/lbs which is the highest rating of any current manual that you can buy TODAY.
Mopar to the bone!!!
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Re: What Tranny and why?
[Re: Lefty]
#1475658
07/30/13 09:13 PM
07/30/13 09:13 PM
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Joined: Feb 2008
Posts: 233 NH
Fastback67
enthusiast
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enthusiast
Joined: Feb 2008
Posts: 233
NH
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Quote:
Automatics don't work well on road a course.
Why not? They come with a host of choices in terms of valve body configurations to suite almost any requirement. For that matter... I heard more than one person lementing over a missed shift costing them time at a recent Hotchkis event. I believe either setup will work just fine myself. It just comes down to the driver and his vehicle, and how well they know each other.
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Re: What Tranny and why?
[Re: Lefty]
#1475660
07/31/13 01:01 PM
07/31/13 01:01 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,442
NW Chicago suburban area
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My 727 has been perfect and bullet-proof in all competition events... manual over-ride (simple shift kit) allows full control at any speed... upshift, downshift at any time and not missing that shift. Sure, manual stick-shift trannys are more fun -- I've owned/driven and raced both in road course and autocross. The skill of the driver (aka "the nut behind the wheel") will make the biggest difference in a competition event. I figure.. it's whatever your car has... and master it.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: What Tranny and why?
[Re: jcc]
#1475662
07/31/13 03:35 PM
07/31/13 03:35 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,442
NW Chicago suburban area
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JCC... picture could have been cropped... that sign is at the track to prevent people from re-entering the track on the pit lane and thus going head-on with coming traffic.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: What Tranny and why?
[Re: mopardamo]
#1475665
08/01/13 02:34 PM
08/01/13 02:34 PM
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Joined: Sep 2003
Posts: 10,645 Houston, Tx
AlexP
I Live Here
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I Live Here
Joined: Sep 2003
Posts: 10,645
Houston, Tx
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Quote:
I have talked with John Cope some and his recommendation for an auto is the 4I80e trans. The 6I80e can do it as well but the 4I80e is lighter and can be built for 1000+ hp. I don't know what if any trans tunnel work is needed though just yet.
Surprised someone has not mentioned the Passion 5 speed yet. I guess the power handling is an unknown at this point too.
Old motor has FI and so will the new combo. Thinking it will handle the lower rpm's on a cruise if the T56 is in 6th. I didn't think about that point though. 528 cubes with fully ported RPM's and 11:1 cr. Cam is on the large side with lift about .7 on the intake. Duration is reasonable in the 264 range.
Damon
The Passon still isn't real yet. I think the price is worth it, when it gets to the users finally.
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Re: What Tranny and why?
[Re: AlexP]
#1475666
08/03/13 03:32 PM
08/03/13 03:32 PM
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Joined: Nov 2005
Posts: 3,456 Fly Over States
PHJ426
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Fly Over States
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If the T56 magnum is around $3000 what in the world are they doing to it to make the price $10,000 using some parts out of unobtanium? http://www.ddperformance.com/magnum.htmlHow much longer is the T56 vs an 833 and how much does that change the driveshaft angle that some people mention is not a good thing when adding either a gear vendors on the tail of a 727 or installing a Tremec 5 or 6 speed trans?
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Re: What Tranny and why?
[Re: PHJ426]
#1475667
08/03/13 04:21 PM
08/03/13 04:21 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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My T56 sits at the factory angle. Length is a little longer than an 833. I scored mine for a good price. The Magnums have wider beefier gears,an internal oil pump,dual speedo outputs and multiple shifter locations among other thing. The trans in my car is the best of the factory T56 derived pre-tr6060. 08 and newer Vipers use the TR6060 which is basically a T56 Magnum but without the multiple shift/speedo options.
Last edited by 72Swinger; 08/03/13 04:26 PM.
Mopar to the bone!!!
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