High hp 5 or 6spd trans?

[Wicked72]

I have supercharged 451 in the works and the hp range will be in the mid 700hp range. I want a 5 or 6spd for a number of reasons but trying to find a trans that can handle that hp and more is difficult. I know the t56 can handle 700 but I want more over kill. I would feel better if I could get a 5 or 6 spd that can handle closer to 800hp. TCI makes a 6spd slush box that they say can handle 850hp which is more then enough but I like rowing gears and the weight difference between the auto vrs the manual I would think to be major. I called TCI and they said their trans is 180lbs (not sure if that was dry or wet but that included the TQ Converter) Does anyone know of a 5 or 6spd that can handle a close 800hp or one I can build to that spec?

[Wicked72]

I should have looked deeper into the post I see one about the Mcleod m-800. looks good! But I still would like to know more about my options. The rest of the drive train and car are going to be setup for that hp.

[red79]

i'm watching the powerblock on spike right now, and they're installing a tremec 6-speed that's been modified by american powertrain to handle 1100 hp (from 700 stock). took a quick look at their website, they support ma mopar as well, and the have a whole range of bulletproof trannies. i imagine they're $$$ though--handling all those torques isn't a cheap proposition

[Wicked72]

yeah thats what ive seen so far... big bucks to handle it...but Im willing to drop the cash when i get it...so the car ends up a life long project i guess but oh well...as long as the world doesnt run out of gas I will be ok.

[Challenger340]

Good Luck on your Trans Conversion Hunt, I'm sure you will find what you are looking for eventually.

"The rest of the Drivetrain & Car are going to be setup for that hp"

What Rear Gear are you planning, and with what Diffy ?

[Wicked72]

I am building my 8 3/4. I am not going to be running large drag slicks so that hp wont be to harsh on it anyway however I am tubing the car to the existing rails which will give me a couple inches of tire width. Depending if I go 5 or 6 speed Im steering more for a 3.91. Im looking at a Auburn posi  with 30spline alloy street/strip axles. And everything reilly motorsports has to offer as far as suspension and brakes. Also frame rail connectors from US Cartool. The connectors will be all that I need for chassis strength but I may do a 4 point cage for the seat belts which wont add a ton of strength that a 6 point or better will but I like getting into the car without busting my butt on a bar. SW race cars has the 6 point bars that curve down very nicely but I do not see a reason to run them.

[Wicked72]

Found a company with a T56 they build to handle 850hp!! http://www.rsgear.com/ They also have one for over 1k hp. the 850hp price is $3500 for a standard ratio and $4000 for a close ratio. This is the price just for the trans so after it all said and done it will be about $5500. its alot of money of I feel its well worth it in the long run. The 6 speed auto I was looking at was over $7000 and weighs about 180lbs.

[BrianShaughnessy]

Supercharged engine.  Big bucks trans.  8 3/4.

     Pick the one that does not belong   

[Cooter]

Lemme see....$5K for a 5-speed set up that'll handle 700 HP......Enter the A-833....Ronnie Sox ran what low 9's all day long with a good 'ol 4-speed...

One $700.00 A-833 (23 Spline), One conversion Dana 60...All for less than that transmission....

I really don't see what the big deal is with the Tremec 5-speeds..We broke one after only 9 passes in a 800HP Mustang and Tremec tolds us that they didn't guarantee them for drag racing..They ain't all that..For street crusing I guess they are, but if I spend that kinda money, it better last like a Jerico or something.

[SFRT]

get a Richmond and slap in a Dana 60

http://www.richmondgear.com/01transmissions.html

[Wicked72]

Ill check out the richmond. I want over drive that why im looking into the t56 and its been modified to handle 850 so I dont see what the problem is since I am building a touring car. As far as the rear I know the 8 3/4 is a bit whimpy for the rest of the drive train but I am not going to use anything but the case and build it as strong as I can. I talked to the guys at strange and they said they have what I need.
I looked into Jerico and a few other and the price are a small fortune and that compared to a $5k trans

[Wicked72]

Would you say just scrap the 8 3/4 anyway and go dana 60?

[Cooter]

As long as you don't hook it, you'll be fine with the 8 3/4 rear..The MINUTE you hook it you will hear those famous last words from an 8 3/4 rear....CHIRP! BANG!


But! Remember, it takes an additional 25-35 EXTRA HP just to turn a Dana 60...

[Wicked72]

Knowing my luck Ill hook it... So would that be a built Dana or would a stock Dana work? Also how about a 9"?

[FLG]

Please dont put a 9" in a mopar! People will argue..bottom line is there about the same as a 8 3/4

Talk to Cass (Dr.Diff) about building you a dana.

[Cooter]

Danas 60 = 9 3/4" ring gear....Biggest, and the baddest rearend ever to be put under a Passenger car...Same with the 426 Hemi engine..Biggest, and baddest set of heads to ever be bolted onto a V8 Musclecar engine from the mid to early seventies....

[Wicked72]

I see dr.diff has them for about $1800 which isnt that much more then what I was gonna spend on the 8 3/4 build which was $1300. I would love a hemi! but thats way out of my budget, I looked into the hemi wedge conversion but that would be over $6k just for the heads and they still need work. Ill just stick to some edelbrock heads and you can gettem cnc ported complete for under $3k.

I sent richmond an e-mail on a trans but the person is way and got a auto msg so I guess ill have to send it again after this holiday is over. I really just want a 5 speed just for over drive. I really dont want to go with a t56 but I plan on driving the car and that much power with no over drive wouldnt be to great.

[BrianShaughnessy]

T56 will require lots of tunnel work.   Super nice if you can do it tho.   Love the T56 in my Firebird...   love my Keisler in my Charger also but sometimes I really want something between 4th and 5th. 

Passon Performance was / maybe still is working on another 5 speed option to complete with the McLeod but I haven't heard any status lately.  Otherwise they do make 18 spline / 4 speed 833OD.   

The Dana is money well spent...  sell the 8 3/4 to somebody that wants to upgrade from a 8 1/4. 

[Wicked72]

Think the 18 spline / 4 speed 833OD will handle everything I throw at it?

[SFRT]

maybe. but its still 4 speed, so with certain gears it sucks.

you can get a killer insane  tailored for you new Dana 60 entire rearend for like 2800.00. totally worth it.

http://www.moserengineering.com/complete-rear-end-assemblies/moser-60-musclepak-muscle-pak-pack.html

[Wicked72]

Thats cheaper then what dr.diff quoted me and thats with breaks. I am getting my brake kit from ReillyMotorSports so that will drop it down some unless I can save a bit by using the ones from moser. Ill have to look into it.
Also I talked to richmond gear and they dont have a trans that I need... I guess the transzilla it is. Its a T56 that they rebuilt to handle 850ft lbs so I dont see why not.. What rear gears did the vipers come with?

[SFRT]

this:

http://www.summitracing.com/parts/RMG-7031710A/

comes with a Long shifter..which is nice.....

[BradD]

I am in the middle of putting a T56 and 426ci/465hp crate in a 70 RR convertible. Just spent $4600+ with American Powertrain for a kit. When I finish the fab work, I will post it on this site.  This is a customer build. I will post pics at that time.

Brad
Dorn Autocraft

[thedodgeboys]

I'm running a t56 in my 70 challenger and love it. 4:10 rear gears 22 mpg at 70 mph on the highway but I'm only about 490 hp on my motor. 

To me it was worth the tunnel mods. 

[BrianShaughnessy]

Passon 5 speed still in the works...   http://board.moparts.org/ubbthreads/showflat.php?Cat=0&Number=6330693&an=0&page=0&gonew=1#UNREAD