Re: 727 parts for street/strip?
[Re: AndyF]
#2811087
08/20/20 02:16 PM
08/20/20 02:16 PM
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Joined: Mar 2006
Posts: 9,835 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,835
MI, usa
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That looks like a classic fatigue failure since it started on an edge and is square across the face. A torsional failure would have more of a spiral shape. So you're probably correct, the shock of the reared end failure probably started a crack and then it just spread over time.
I have 5 or 6 core transmissions to pick parts from so I'm going thru them and grabbing the best parts from each. Most of them have good internals but a couple of them have toasted rear drums. Not sure why, but the rear bands are shot and the drums show signs of being overheated. So I'll probably toss those parts unless they are worth something as cores. Rear drum is only used in reverse and 1st gear braking. There shouldnt be an issue with those parts unless it was a plow truck. Doug
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Re: 727 parts for street/strip?
[Re: AndyF]
#2814949
08/29/20 10:44 PM
08/29/20 10:44 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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Appears you’re already done, but I think you would have/still can, benefit from the modification that dvw’s son did to his. He used the park hub as an output shaft tone wheel for speed input. Drill and thread the housing. You of all people should be able to put that to good use.
"use it 'till it breaks, replace as needed"
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Re: 727 parts for street/strip?
[Re: AndyF]
#2815010
08/30/20 06:12 AM
08/30/20 06:12 AM
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Joined: Jan 2003
Posts: 2,917 A shed in England
Tig
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master
Joined: Jan 2003
Posts: 2,917
A shed in England
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Replaced the I/P and O/P shaft when the ring and pinion failed. JFI the upgraded O/P shafts don't have the worm splines machined in for a speedo drive.
'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: 727 parts for street/strip?
[Re: AndyF]
#2815660
08/31/20 08:28 PM
08/31/20 08:28 PM
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Joined: Sep 2006
Posts: 3,010 Sac, CA
mopowers
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master
Joined: Sep 2006
Posts: 3,010
Sac, CA
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I had a design for a plug like that but then decided to go with a simple retainer on top of the cup plug. Either way should prevent an issue. What'd your retainer end up looking like?
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Re: 727 parts for street/strip?
[Re: Alchemi]
#2816599
09/03/20 10:39 AM
09/03/20 10:39 AM
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Joined: Jan 2003
Posts: 31,027 Oregon
AndyF
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I Win
Joined: Jan 2003
Posts: 31,027
Oregon
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Just out of interest, did/can you weigh the 5 pinion planetary against any others? I didn't put it on the scale. It was heavier but not super heavy. Maybe 5 lbs while the factory aluminum 4 pinion one that I had in there was 3.5 lbs or something like that. So it does add weight to the assembly but it can be offset with a lightweight sun shell or the aluminum park gear or something else.
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Re: 727 parts for street/strip?
[Re: AndyF]
#2817848
09/06/20 02:57 PM
09/06/20 02:57 PM
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Joined: Mar 2011
Posts: 3,076 Michigan
A727Tflite
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master
Joined: Mar 2011
Posts: 3,076
Michigan
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I have a few different input shafts to choose from so I'm trying to decide which is the best to use. Are the later generation with the three sealing rings better than the earlier two ring style? I'm not sure I understand the oiling difference. The early ones have a hole in the shaft but the later one doesn't. So there must have been a change along the way but I haven't found any reference yet to what else changed. You cannot interchange the input shaft unless you keep the matching reaction shaft support.
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Re: 727 parts for street/strip?
[Re: AndyF]
#2817908
09/06/20 05:13 PM
09/06/20 05:13 PM
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Joined: Jan 2003
Posts: 25,786 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,786
Rio Linda, CA
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On the 3-ring input, the middle and rear ring (actually on the clutch retainer) feed the rear clutch, the middle and front ring are for the lockup converter. No advantage to use it on a non-lockup trans.
The INTERNET, the MISinformation superhighway
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Re: 727 parts for street/strip?
[Re: John_Kunkel]
#2817917
09/06/20 05:27 PM
09/06/20 05:27 PM
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Joined: Jan 2003
Posts: 31,027 Oregon
AndyF
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I Win
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OP
I Win
Joined: Jan 2003
Posts: 31,027
Oregon
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On the 3-ring input, the middle and rear ring (actually on the clutch retainer) feed the rear clutch, the middle and front ring are for the lockup converter. No advantage to use it on a non-lockup trans. Okay, that makes sense. I have parts from a 1978 big block 727 (non-lockup) on hand as well as parts from a lock-up 727. The input shaft on the non-lockup is solid between the middle and front ring while on the lockup input shaft there is a hole there. The input shaft from the non-lockup '78 trans is in nice shape so I was planning on using it along with the late model pump and reaction shaft. Is there a difference between the pump and reaction shaft in the lockup vs. the non-lockup 727 or can I use either on? I looked them over and didn't see a difference but there must be some sort of additional fluid passage in the lockup one that I missed.
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