727 failure (pics)
#79
04/03/03 10:50 PM
04/03/03 10:50 PM
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Well, as many may recall I blew the 8 3/4's ring and pinion the last time out last year. Since then, I've purchased and installed a new Dana 60, and 727Jim is in the middle of the trans. rebuild. This was a fresh rebuild on the trans. and everything checked out good, and Todd440 and I used good parts in it when we rebuilt it. The trans. worked pefectly right up until the rear-end failure. This is good reason for tearing down the trans. after a rear end failure.
This is the front planetary. Can you see the stripped splines on the inside?
Bad photo, but this is the strut bar for the front band tension. Its suppossed to be straight!!
This was a brand new bolt in sprag. All the bearings and springs are missing because they were all over the place.
This is the thingy that holds the bearing and springs for the over-running clutch. Ouch!!!
So, I've gathered that after a rear-end failure, the 727 is like a box of chocolates. Youre never sure what youre gonna get. Use a bolt in sprag and a trans. blanket or shield if youre gonna race it. This could have been much worse..
Last edited by Unlawfl; 04/03/03 10:53 PM.
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Re: 727 failure (pics)
[Re: 440Jim]
#82
04/03/03 11:01 PM
04/03/03 11:01 PM
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Gary, why did breaking ring and pinion break tranny> Me confused. Glad your getting it done. Heard Jims the man.
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Re: 727 failure (pics)
#83
04/03/03 11:05 PM
04/03/03 11:05 PM
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Quote:
Gary, why did breaking ring and pinion break tranny> Me confused. Glad your getting it done. Heard Jims the man.
Todd's the man too!! I just had Jim do this one because I'm too busy to get in to it myself like I would have wanted to with Todd, plus I know Todd is busy bustin' tale on the new Coronet. Anyway, I guess its the "shock" of the break in the drivetrain that causes this. sometimes you get lucky, sometimes you dont...
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Re: 727 failure (pics)
#84
04/03/03 11:08 PM
04/03/03 11:08 PM
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Joined: Jan 2003
Posts: 10,011 Frostbitefalls MN (Rocky&Bullw...
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Gary, sorry to hear about the breakage! It can be brutal, the front drum sawed its' way right out of a friends barracuda years back, up through the floor, dash, and out the windshield! He was lucky, and only got a hot fluid bath!
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 727 failure (pics)
[Re: gregsdart]
#85
04/03/03 11:12 PM
04/03/03 11:12 PM
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Quote:
Gary, sorry to hear about the breakage! It can be brutal, the front drum sawed its' way right out of a friends barracuda years back, up through the floor, dash, and out the windshield! He was lucky, and only got a hot fluid bath!
Greg, I consider myself fortunate. On this particular day I did not have my trans blanket on. I was playing with a new fitting on the trans. earlier in the week prior, and didnt have time to put it back on. It could have been real bad news...
Last edited by Unlawfl; 04/03/03 11:34 PM.
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Re: 727 failure (pics)
#87
04/03/03 11:17 PM
04/03/03 11:17 PM
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Joined: Jan 2003
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Re: 727 failure (pics)
#88
04/03/03 11:19 PM
04/03/03 11:19 PM
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I am having kelm do me a new Tranny this month. I am finally likking the one in the Dart now. Kelvlar bands eat up the drum or something they said. Anyways, I hope to have it done in a month. I am having Bolt in sprague reguardless of All the guys here who say its a waste.
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Re: 727 failure (pics)
#91
04/03/03 11:34 PM
04/03/03 11:34 PM
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striped front planets and blown roller clutch failures are pretty common. 4 pinion planets are preferred when building TFs for high performance applications, and most replace three planet pinions when doing the rebuild. there are different splines on the output shafts and one can easily mis match planets and output shafts. I'm building close to 20 years and I've made the mistake we are all human. as far as the rear roller clutch failure I agree the loading and unloading the transmission in 1st gear will definitly cause the failure. most are under the impression that bolt in sprags will eliminate the failure but in reality it just saves the case. Just my .02
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Re: 727 failure (pics)
#92
04/03/03 11:41 PM
04/03/03 11:41 PM
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"loading and un-loading" is what the darn tires did all year.. Lack of traction/good suspension can prove costly...
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Re: 727 failure (pics)
#93
04/04/03 01:08 AM
04/04/03 01:08 AM
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I hate to look at that stuff because right at the moment, I'm rebuilding mine. I was cleaning my planetaries just a hour ago. I was told putting in one of those bolt in sprags was a waste of money too. I put it in anyway. It's a numbers-matching case and I don't want to risk destroying it if I did something stupid or even accidental, heck, your damage was caused by a failure of another component it seems. Your scenario could happen to anyone. Thanks for sharing the info. I wish I had a couple extra parts to throw your way.
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Re: 727 failure (pics)
#95
04/04/03 01:22 AM
04/04/03 01:22 AM
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Unlawfl, I know what you mean.....Broken rearend = Nasty 727....... Good luck!
"I'm not a Gynecologist, but I'll take a look."
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Re: 727 failure (pics)
#96
04/04/03 01:30 AM
04/04/03 01:30 AM
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Hey JohnRR, the bolt in sprag was $33. The Red-Head anchors from which I pulled the sleeves from cost $1.65. It took me 20 minutes to install. If I told you I spent $13 on a brand new output shaft support, you'd probably tell me I wasted my money on that too. Get lost!
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Re: 727 failure (pics)
[Re: CrazyRocker70]
#98
04/04/03 02:55 AM
04/04/03 02:55 AM
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Gary if you need parts give me a list I have a ton of TF8 parts in the shop
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