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Torqueflite strength? #3058281
07/11/22 03:21 PM
07/11/22 03:21 PM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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I have been considering a move to a 580 cu in 572-13 motor with 15/1 compression on methanol. Expected power would be over 1050 hp at 7400 rpm. Torque will be 800 + somewhere. Can stock input and output shafts handle this kind of power? Launch will be about 4800 rpm or less, with a converter that will flash to 6300 behind this beast. Tires are 10.5 x 33 hoosiers so shock from launch shouldn't be too bad. Tell me your experiences of stock shaft failures so i can figure out whether i want to try this.

Last edited by gregsdart; 07/11/22 03:22 PM.

8.77 153 mph best, 3055 lbs 528 indy 440-1 alky
Re: Torqueflite strength? [Re: gregsdart] #3058288
07/11/22 03:35 PM
07/11/22 03:35 PM
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MI, usa
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Mines had the same stock input and output shafts since 2013. Over 800 passes. The parts I'd be swapping in? Super sprag (A&A , ATI, Ect), good front drum, steel hub front planet. Though I've never failed pump gears or an input hub those would be the next on the list.
Doug

Re: Torqueflite strength? [Re: gregsdart] #3058305
07/11/22 04:15 PM
07/11/22 04:15 PM
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Dallas, TX
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440Brian Offline
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I broke a stock output shaft in my 727 this March at the launch after about 350 passes. It's behind a 505 and I think it's only about 550HP (2,980 lbs @130 mph running NHRA Super Street) with 14.5"x32" MT slicks. I launch at 5,400 and it flashes up to about 5,900 rpm. The rest of transmission has been great (it's a well built CRT).

Re: Torqueflite strength? [Re: 440Brian] #3058334
07/11/22 05:41 PM
07/11/22 05:41 PM
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MN
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JERICOGTX Offline
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At that power, and your weight, I don’t know why you haven’t switched to a glide? Engler switched to a Glide in his 3400lb Coronet this year, and in 5 races he’s pocketed $11,000 this year. It made the car deadly consistent.


69 GTX 68 Road Runner
Re: Torqueflite strength? [Re: gregsdart] #3058346
07/11/22 06:16 PM
07/11/22 06:16 PM
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A shed in England
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We snapped an o/p shaft when a ring and pinion failed (Dana). We replaced both the i/p and o/p with H/D ones on the rebuild and it lived behind a 900+ft/lb 655 wedge with no apparent issues. Long term, we intend to switch to a TH400 derivative box and a 9" type rear.
[Linked Image]


'74 Challenger..9.46 and 145.9 so far. 4023lb!!!# N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @142.4 with our old mule 580 wedge
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
Re: Torqueflite strength? [Re: gregsdart] #3058349
07/11/22 06:18 PM
07/11/22 06:18 PM
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Bend,OR USA
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I'm thinking of calling Pro Trans, 661-940-7400, about buying and using one of their custom built Pro Flights for my new Top Sportsmans B1-MC headed car.
I know one west coast 10.5 outlaw racer that used them with really good results making near 2000 HP work


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Torqueflite strength? [Re: JERICOGTX] #3058353
07/11/22 06:34 PM
07/11/22 06:34 PM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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Originally Posted by JERICOGTX
At that power, and your weight, I don’t know why you haven’t switched to a glide? Engler switched to a Glide in his 3400lb Coronet this year, and in 5 races he’s pocketed $11,000 this year. It made the car deadly consistent.

Because its fun,, 😁people would come to the line and watch to see what would happen this time,😵‍💫😲


8.77 153 mph best, 3055 lbs 528 indy 440-1 alky
Re: Torqueflite strength? [Re: gregsdart] #3058363
07/11/22 07:02 PM
07/11/22 07:02 PM
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Ambridge, Pa.
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rickraw Online content
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If you want to stay 727, billet input, output shafts, steel plantaries. $$$

Re: Torqueflite strength? [Re: rickraw] #3058391
07/11/22 09:00 PM
07/11/22 09:00 PM
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st.louis,mo.
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put a powerglide in it and be done.or be like this

0524100827.jpg
Re: Torqueflite strength? [Re: gregsdart] #3058406
07/11/22 09:52 PM
07/11/22 09:52 PM
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Milwaukee WI
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TRENDZ Offline
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I was twisting input/ output shafts at around 800 hp. 3700 lb car, mid nines 1/4. Went to A&A input/output shafts and had zero problems after that. The car eventually was running high 8s @155 at 3700 lbs with a 3.50 rear gear. Engine was making some good power and had a lot of weight and gear ratio to fight. Trans was reliable and predictable.


"use it 'till it breaks, replace as needed"
Re: Torqueflite strength? [Re: TRENDZ] #3058409
07/11/22 10:06 PM
07/11/22 10:06 PM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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Originally Posted by TRENDZ
I was twisting input/ output shafts at around 800 hp. 3700 lb car, mid nines 1/4. Went to A&A input/output shafts and had zero problems after that. The car eventually was running high 8s @155 at 3700 lbs with a 3.50 rear gear. Engine was making some good power and had a lot of weight and gear ratio to fight. Trans was reliable and predictable.

Where were the output shafts breaking? I plan on at least an upgrade to the input shaft and hub. I figure on leaving a bit soft since i have a lot of gear and only an 8.50 cert


8.77 153 mph best, 3055 lbs 528 indy 440-1 alky
Re: Torqueflite strength? [Re: gregsdart] #3058432
07/11/22 10:56 PM
07/11/22 10:56 PM
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CA, USA
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I run a Torqueflite from Protrans. Its a killer piece. Billet input and output shafts, no stock internal in it. It was 1/3 the price of a similar TH400. I have put over 50 passes on it. I leave at 12 psi of boost which is good for just over 1,000 hp and probably similar torque since I leave at 4800 rpm. Zero problems with it.So far my 3400# car has gone low 8's with this combo.


68 twin turbo Dart 8.19 so far
70 Swinger 360
69 Roadrunner 383 4 speed
69 Mod Top Satellite 383 auto
69.5 A12 Super Bee 4 speed
70 T/A Challenger
70 FC7 Duster 340 4 speed
70 FJ5 Superbird
68 Hemi 4 speed Roadrunner
71 Duster W2 340
Re: Torqueflite strength? [Re: gregsdart] #3058433
07/11/22 11:01 PM
07/11/22 11:01 PM
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Milwaukee WI
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TRENDZ Offline
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never broke a shaft, always twisted them. the lube holes in the shafts would go from round to oval, and the slines would have an offset twist in them.


"use it 'till it breaks, replace as needed"
Re: Torqueflite strength? [Re: 69b1dart] #3058527
07/12/22 09:27 AM
07/12/22 09:27 AM
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U.S.S.A.
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Originally Posted by 69b1dart
put a powerglide in it and be done.or be like this


haha that's what happens with a stock sprag and a stock front drum ...


running up my post count some more .
Re: Torqueflite strength? [Re: JohnRR] #3058532
07/12/22 10:08 AM
07/12/22 10:08 AM
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S. Central PA
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Originally Posted by JohnRR
Originally Posted by 69b1dart
put a powerglide in it and be done.or be like this


haha that's what happens with a stock sprag and a stock front drum ...


Guy's like a broken record. Doesn't matter if you fried a clutch, or broke a hard part...he posts that same picture with the same stupid comment.

Re: Torqueflite strength? [Re: gregsdart] #3058537
07/12/22 10:52 AM
07/12/22 10:52 AM
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Taxes & Virus's R-US, NY
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Originally Posted by gregsdart
I have been considering a move to a 580 cu in 572-13 motor with 15/1 compression on methanol. Expected power would be over 1050 hp at 7400 rpm. Torque will be 800 + somewhere. Can stock input and output shafts handle this kind of power? Launch will be about 4800 rpm or less, with a converter that will flash to 6300 behind this beast. Tires are 10.5 x 33 hoosiers so shock from launch shouldn't be too bad. Tell me your experiences of stock shaft failures so i can figure out whether i want to try this.


I can say, I have never pushed one that hard....We have made 850hp and had no issues....We build them per what A&A recommends for parts for that level. At your level, a glide will probably be cheaper and hold up better. The only thing is with a glide, it tends to take a couple tries to get the convertor where you want it. Much fussier without that extra gear to get you moving. ...

Now I have a friend pushing a 727 to 1200hp in a blown application, and it can be done, but he seems to find the limits of everything, and that is where he cracked a case....I don't think there was anything else that failed on him.


'70 Cuda,...605 Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown Hemi Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: Torqueflite strength? [Re: Dragula] #3058742
07/12/22 11:58 PM
07/12/22 11:58 PM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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I have determined that i need a better input shaft and hub, the rest, except for the output shaft, is good parts . To keep it alive with a 580 i figure a short part throttle launch will suffice. Once the car gets moving a foot or two stresses start to drop pretty fast. So maybe leave at 4000, .2 or . 3 at half throttle, it should live and maybe, just maybe i can stick the tires!


8.77 153 mph best, 3055 lbs 528 indy 440-1 alky
Re: Torqueflite strength? [Re: gregsdart] #3058804
07/13/22 09:17 AM
07/13/22 09:17 AM
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Minnesota
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We just installed an A and A Torqueflite in our Road Runner. There is quite a difference between my home built torqueflite with a Turbo Action transbrake and the transmission from A and A. The A and A has all the best internals. The A and A is more positive in all gears. The transbrake is more positive when it engages and most importantly, the car is quicker with no other changes. If you haven't talked to Rick Allison, you should. He knows what he is doing. As an aside, my son and I went and saw Rick's facility. It is one of the most impressive shops I have ever been in.

Re: Torqueflite strength? [Re: R3 Racing] #3058826
07/13/22 10:41 AM
07/13/22 10:41 AM
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fredericksburg,va
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Trans of choice for early nitro funny cars (2500 hp?) reason Beattie started ATI for his Black Magic cars

Re: Torqueflite strength? [Re: cudaman1969] #3058872
07/13/22 12:52 PM
07/13/22 12:52 PM
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Las Vegas
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Las Vegas
I have a Joels on Joy proflite behind my 64. Was 3600lbs with me in it and makes 4 digit power(8.80's 155)


"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"
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