Re: Big power & 727… input or output shaft the weak link?
[Re: polyspheric]
#3125707
03/01/23 05:00 PM
03/01/23 05:00 PM
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Joined: Jan 2003
Posts: 75,282 A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,282
A gulag near you.
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What does this remind me of? "When should I stop "improving" my 8-3/4 and get a 9"?"
Rossler T400 They blow up too.
Mainstream Media is the new Pravda
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Re: Big power & 727… input or output shaft the weak link?
[Re: topfueldart]
#3125708
03/01/23 05:03 PM
03/01/23 05:03 PM
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Joined: Jan 2003
Posts: 75,282 A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,282
A gulag near you.
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I’d run em! Personally I’ll think you’ll be fine. At its current power level, I think it’s ok, but being it’s turbo’d, it’s really easy to pickup another 100 horse. I did already break a set of stock pump gears, and I plan to do a drag and drive this year, so considering all upgrade options since it’s already out. I think my combo is potentially pretty hard on hard parts leaving on a bunch of boost with the transbrake, and stiff/short radials. Spend it now or spend it later. Trans is out, it's hard to find 727 parts when everyone else is running .. insert GM trans here ....
Mainstream Media is the new Pravda
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Re: Big power & 727… input or output shaft the weak link?
[Re: JohnRR]
#3125718
03/01/23 05:45 PM
03/01/23 05:45 PM
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Joined: Jan 2003
Posts: 2,697 Renton Wa
topfueldart
OP
master
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OP
master
Joined: Jan 2003
Posts: 2,697
Renton Wa
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A friend of mine was doing the burnout contest at carlisle one year and broke the output shaft at the end of the front planet splines. Car was stationary , 383 - 2bbl in a 69 Satellite wagon. What happened was the spiders in his single track 3.23 gear rear end seized on it's shaft shaft and in the split second it took for the spiders to break into pieces it shocked the driveline enough to break the output shaft. He was lucky because the rear sprag in the trans was also rolled, I don't know when that happened though as he didn't really beat on the car outside of that one burnout contest.
My pumps gears broke on decel or engine shut off, after a usual pass. Fired the car back up at the ticket shack and it wouldn’t move.
11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.
9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.
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Re: Big power & 727… input or output shaft the weak link?
[Re: 440Jim]
#3125753
03/01/23 07:38 PM
03/01/23 07:38 PM
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Joined: Jan 2003
Posts: 11,786 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,786
Portage,michigan
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My input and output shafts have 850+ passes. Though all are footbrake. I've broken 3 Dana pinion gears. Dizusters turbo car also ran stock shafts. Its broken rear axle pinion shafts, aftermarket steel drive shafts. But never either trans shaft, Both were over 850 hp. His weighed 3750, mine 3350. Both are 65 push button. Both have stripped stock front planet carriers. Both run stock pump gears. Doug I broke the "ears" off one set of stock 727 pump gears also. It happened during the Mopar weekend about 2008, during time trials. With the help of a couple racers, we pulled the trans, took it apart, found some new pump gears at a vendor; and I made the first round of eliminations. I remember being under your Dart getting it out….lol You helped me running a charger up to the lanes in later rounds
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam, footbrake street/strip car Best so far, 10.32 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: Big power & 727… input or output shaft the weak link?
[Re: topfueldart]
#3125825
03/02/23 12:25 AM
03/02/23 12:25 AM
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Joined: Jan 2007
Posts: 289 So. IL. USA
PLUM BAD
enthusiast
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enthusiast
Joined: Jan 2007
Posts: 289
So. IL. USA
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I broke a hub two years ago. [/url][/img] And a band anchor last year. [/url][/img]
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Re: Big power & 727… input or output shaft the weak link?
[Re: PLUM BAD]
#3125849
03/02/23 09:31 AM
03/02/23 09:31 AM
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Joined: Mar 2011
Posts: 3,177 Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,177
Michigan
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I broke a hub two years ago. [/url][/img] And a band anchor last year. [/url][/img] Your hub broke due to the very common issue of hub to support interference. Notice the shiny area just above the break.
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Re: Big power & 727… input or output shaft the weak link?
[Re: B3422W5]
#3125889
03/02/23 12:30 PM
03/02/23 12:30 PM
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Joined: Jan 2003
Posts: 16,936 NC
440Jim
I Live Here
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I Live Here
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Posts: 16,936
NC
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I remember being under your Dart getting it out….lol You helped me running a charger up to the lanes in later rounds
Blast from the past. Eric on the back of my mini-bike, hauling a generator and charger to the staging lanes. From the date on this pic, it was 2005. It looked so funny, someone took a picture and gave it to us later... LOL
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Re: Big power & 727… input or output shaft the weak link?
[Re: A727Tflite]
#3125927
03/02/23 02:52 PM
03/02/23 02:52 PM
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Joined: Jan 2003
Posts: 2,697 Renton Wa
topfueldart
OP
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OP
master
Joined: Jan 2003
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Renton Wa
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Your hub broke due to the very common issue of hub to support interference. Notice the shiny area just above the break.
Can you elaborate on this at all? Any specific cause, or just something to keep an eye out for? I imagine a thicker fiber washers would help push the hub back.
11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.
9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.
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Re: Big power & 727… input or output shaft the weak link?
[Re: topfueldart]
#3125932
03/02/23 03:08 PM
03/02/23 03:08 PM
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Joined: Mar 2011
Posts: 3,177 Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,177
Michigan
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Your hub broke due to the very common issue of hub to support interference. Notice the shiny area just above the break.
Can you elaborate on this at all? Any specific cause, or just something to keep an eye out for? I imagine a thicker fiber washers would help push the hub back. Edit - incorrect or broken #1 or 2 thrust, or mismatched parts. Notice the earlier picture of a truly broken hub, it has a rough appearance. The second image is a smooth break, like it was machined in a lathe. When first building the unit, place the empty support on the input assembly and see if there is interference.
Last edited by Transman; 03/02/23 08:18 PM.
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Re: Big power & 727… input or output shaft the weak link?
[Re: 440Jim]
#3126384
03/04/23 10:05 AM
03/04/23 10:05 AM
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Joined: Jan 2003
Posts: 11,786 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,786
Portage,michigan
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I remember being under your Dart getting it out….lol You helped me running a charger up to the lanes in later rounds
Blast from the past. Eric on the back of my mini-bike, hauling a generator and charger to the staging lanes. From the date on this pic, it was 2005. It looked so funny, someone took a picture and gave it to us later... LOL Haha….I remember seeing that years ago. You guys bailed me out that night!
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam, footbrake street/strip car Best so far, 10.32 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: Big power & 727… input or output shaft the weak link?
[Re: topfueldart]
#3126947
03/06/23 12:06 PM
03/06/23 12:06 PM
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Joined: Jan 2003
Posts: 13,496 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Posts: 13,496
Marion, South Carolina [><]
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FWIW I still have the stock shafts in the 727 in my cuda. It's over 3800 lbs and ran mid 9s NA from 2006-2015 w/ no trouble. Been running 8s on nitrous ever since. I don't race it very often though. From what others have experienced, it wouldn't surprise me if it snapped something the next time I ran it.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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