Torqueflite strength?
#3058281
07/11/22 03:21 PM
07/11/22 03:21 PM
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Joined: Jan 2003
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gregsdart
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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..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Torqueflite strength?
[Re: 440Brian]
#3058334
07/11/22 05:41 PM
07/11/22 05:41 PM
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Joined: Jan 2003
Posts: 10,049 MN
JERICOGTX
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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
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Re: Torqueflite strength?
[Re: gregsdart]
#3058346
07/11/22 06:16 PM
07/11/22 06:16 PM
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Joined: Jan 2003
Posts: 2,937 A shed in England
Tig
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master
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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.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 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 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Torqueflite strength?
[Re: gregsdart]
#3058349
07/11/22 06:18 PM
07/11/22 06:18 PM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
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I Win
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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
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Torqueflite strength?
[Re: JERICOGTX]
#3058353
07/11/22 06:34 PM
07/11/22 06:34 PM
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Joined: Jan 2003
Posts: 10,019 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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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. Because its fun,, 😁people would come to the line and watch to see what would happen this time,😵💫😲
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Torqueflite strength?
[Re: gregsdart]
#3058406
07/11/22 09:52 PM
07/11/22 09:52 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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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"
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Re: Torqueflite strength?
[Re: TRENDZ]
#3058409
07/11/22 10:06 PM
07/11/22 10:06 PM
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gregsdart
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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. 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..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Torqueflite strength?
[Re: gregsdart]
#3058432
07/11/22 10:56 PM
07/11/22 10:56 PM
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Joined: Sep 2005
Posts: 263 CA, USA
JcodeCharger
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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
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Re: Torqueflite strength?
[Re: gregsdart]
#3058433
07/11/22 11:01 PM
07/11/22 11:01 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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master
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Milwaukee WI
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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"
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Re: Torqueflite strength?
[Re: JohnRR]
#3058532
07/12/22 10:08 AM
07/12/22 10:08 AM
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sixpakdodge
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put a powerglide in it and be done.or be like this 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.
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Re: Torqueflite strength?
[Re: gregsdart]
#3058537
07/12/22 10:52 AM
07/12/22 10:52 AM
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Joined: May 2004
Posts: 12,418 Taxes & Virus's R-US, NY
Dragula
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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. 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.
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Re: Torqueflite strength?
[Re: Dragula]
#3058742
07/12/22 11:58 PM
07/12/22 11:58 PM
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Joined: Jan 2003
Posts: 10,019 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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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..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Torqueflite strength?
[Re: cudaman1969]
#3058872
07/13/22 12:52 PM
07/13/22 12:52 PM
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Joined: Jan 2003
Posts: 19,384 Las Vegas
Al_Alguire
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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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