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SB TF727 issue - lost third and reverse #774122 08/15/10 02:37 PM 08/15/10 02:37 PM
Joined: Jan 2003 Posts: 3,719 Space Station #5 471Magnum OP master
471Magnum OP master Joined: Jan 2003 Posts: 3,719 Space Station #5	In route to Mopar Nationals, my Roadrunner broke down. We were cruising down the interstate at 60 mph or so and the transmission just downshifted to second. No sign of any slippage. Throttle linkage was set right and it seemed to have plenty of throttle pressure. No leaking and fluid looks and smells clean. Still shifts through first and second, but no reverse either. Guessing I lost a band or clutch pack. I'll be pulling the transmission this week and probably bringing it to a friend for repair, but I'm looking for some advanced pre-diagnosis. -Jim I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it. Currently Mopar-less

Re: SB TF727 issue - lost third and reverse [Re: 471Magnum] #774123 08/15/10 02:51 PM 08/15/10 02:51 PM
Joined: Jul 2008 Posts: 30,465 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,465 Florida STAYcation	You probably BLEW OUT the rubber seal in the front clutch piston.... a 50 cent seal

Re: SB TF727 issue - lost third and reverse [Re: dOc !] #774124 08/15/10 03:06 PM 08/15/10 03:06 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Quote: You probably BLEW OUT the rubber seal in the front clutch piston.... a 50 cent seal

Re: SB TF727 issue - lost third and reverse [Re: 1_WILD_RT] #774125 08/15/10 03:26 PM 08/15/10 03:26 PM
Joined: Jan 2003 Posts: 3,719 Space Station #5 471Magnum OP master
471Magnum OP master Joined: Jan 2003 Posts: 3,719 Space Station #5	So... what causes it to blow out? Mis-assembly? Do I need to remove the transmission and tear it down to replace the seal, or can it be done in car? Got a part number for the seal? Point me to the right page in the FSM. I'm flipping through looking for it. -Jim I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it. Currently Mopar-less

Re: SB TF727 issue - lost third and reverse [Re: 471Magnum] #774126 08/15/10 04:51 PM 08/15/10 04:51 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: So... what causes it to blow out? Mis-assembly? Do I need to remove the transmission and tear it down to replace the seal, or can it be done in car? Got a part number for the seal? Point me to the right page in the FSM. I'm flipping through looking for it. the converter got to come out..the front pump is got to come out..the front drum with clutch pak is gotta come out... get the idea... Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: SB TF727 issue - lost third and reverse [Re: 70AARcuda] #774127 08/15/10 05:01 PM 08/15/10 05:01 PM
Joined: Jan 2003 Posts: 3,719 Space Station #5 471Magnum OP master
471Magnum OP master Joined: Jan 2003 Posts: 3,719 Space Station #5	Dangit. Thought I might get lucky on that one. -Jim I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it. Currently Mopar-less

Re: SB TF727 issue - lost third and reverse [Re: 70AARcuda] #774128 08/15/10 07:11 PM 08/15/10 07:11 PM
Joined: Jul 2008 Posts: 30,465 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,465 Florida STAYcation	Quote: So... what causes it to blow out? Mis-assembly? From this statement you made .. this trans was supposedly redone a short time ago ?

Re: SB TF727 issue - lost third and reverse [Re: dOc !] #774129 08/15/10 09:47 PM 08/15/10 09:47 PM
Joined: Jan 2003 Posts: 3,719 Space Station #5 471Magnum OP master
471Magnum OP master Joined: Jan 2003 Posts: 3,719 Space Station #5	Quote: From this statement you made .. this trans was supposedly redone a short time ago ? Only owned the car about a month. PO claims it has a few thousand miles on it.

Re: SB TF727 issue - lost third and reverse [Re: 471Magnum] #774130 08/16/10 02:43 AM 08/16/10 02:43 AM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	You might want to pull the VB first and check it, I had a valve body that cracked the wall on one of the fluid passages and did what you describe. Probably the same fluid path as the front clutch like described by everyone else.

Re: SB TF727 issue - lost third and reverse [Re: 471Magnum] #774131 08/16/10 03:36 AM 08/16/10 03:36 AM
Joined: Jan 2003 Posts: 541 chatham, Ilinois F fox super street
fox super street F Joined: Jan 2003 Posts: 541 chatham, Ilinois	It should have dropped to first. If it actually went to second something else happened.

Re: SB TF727 issue - lost third and reverse [Re: fox] #774132 08/16/10 02:38 PM 08/16/10 02:38 PM
Joined: Jan 2003 Posts: 3,719 Space Station #5 471Magnum OP master
471Magnum OP master Joined: Jan 2003 Posts: 3,719 Space Station #5	Anyone else have an opinion? -Jim I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it. Currently Mopar-less

Re: SB TF727 issue - lost third and reverse [Re: 471Magnum] #774133 08/16/10 08:53 PM 08/16/10 08:53 PM
Joined: Mar 2003 Posts: 571 Beaverton, OR, USA Alikazam super gas
Alikazam super gas Joined: Mar 2003 Posts: 571 Beaverton, OR, USA	I had a weird problem with a different make transmission where it wanted to be in 2nd and 3rd at the same time... was a stuck valve in the valve body. I'd definitely look at that first. Good luck!

Re: SB TF727 issue - lost third and reverse [Re: 471Magnum] #774134 08/17/10 02:27 PM 08/17/10 02:27 PM
Joined: Jan 2003 Posts: 75,080 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,080 U.S.S.A.	if you lost first and reverse it would be the front clutch, either the inner seal let go or you have a fluid path leak , and it would be a huge one. As said drop the VB and with a rubber tip air gun you can test the clutch pack , if you hear a loud air rush you have a blown seal or crack in the case , or the front pump and/or gasket , be prepared to get covered in trans fluid. If this happened after a 1000 or so miles I would just bite the bullet and pull it and go thru it , auto trans repair shops will reuse whatever parts they can, clutches and seals included.

Re: SB TF727 issue - lost third and reverse [Re: JohnRR] #774135 08/17/10 03:16 PM 08/17/10 03:16 PM
Joined: Jan 2003 Posts: 3,719 Space Station #5 471Magnum OP master
471Magnum OP master Joined: Jan 2003 Posts: 3,719 Space Station #5	The bullet will get bit. Plan to pull the transmission tomorrow night. I'll bring it to a trusted friend for repair. I've got a good spare 727. Unfortunately, it's a BB unit, but if I've got some broken hard parts, it will make a good doaner.

Re: SB TF727 issue - lost third and reverse [Re: 471Magnum] #774136 08/19/10 01:58 PM 08/19/10 01:58 PM
Joined: Jan 2003 Posts: 3,719 Space Station #5 471Magnum OP master
471Magnum OP master Joined: Jan 2003 Posts: 3,719 Space Station #5	Got the transmission out last night. Lots of metal in the pan. It's headed over to a friends for a complete tear down and rebuild.

Re: SB TF727 issue - lost third and reverse [Re: dOc !] #774137 08/22/10 04:28 PM 08/22/10 04:28 PM
Joined: Jan 2003 Posts: 3,719 Space Station #5 471Magnum OP master
471Magnum OP master Joined: Jan 2003 Posts: 3,719 Space Station #5	Quote: You probably BLEW OUT the rubber seal in the front clutch piston.... a 50 cent seal Give the man a cigar. Just got the word that it was the piston seal. $.50 plus $133.50 in labor. Actually, a few more parts went into cleaning it up and putting it back together, but the damage was 134 bucks, not including my labor doing the R&R. -Jim I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it. Currently Mopar-less

Re: SB TF727 issue - lost third and reverse [Re: 471Magnum] #774138 08/22/10 06:36 PM 08/22/10 06:36 PM
Joined: Jul 2008 Posts: 30,465 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,465 Florida STAYcation	Ceegar ? ... THX ... but I quit smoking back in 1991 !! Was that seal hard and brittle(and break-apart) ...or did it just roll-over ?

Re: SB TF727 issue - lost third and reverse [Re: dOc !] #774139 08/22/10 07:06 PM 08/22/10 07:06 PM
Joined: Jan 2003 Posts: 3,719 Space Station #5 471Magnum OP master
471Magnum OP master Joined: Jan 2003 Posts: 3,719 Space Station #5	Quote: Was that seal hard and brittle(and break-apart) ...or did it just roll-over ? Actually, I spoke too soon. No cigar. It was actually the front piston lip seal. Apparently the guy that rebuilt it previously got a little careless. -Jim I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it. Currently Mopar-less

Re: SB TF727 issue - lost third and reverse [Re: 471Magnum] #774140 08/22/10 07:13 PM 08/22/10 07:13 PM
Joined: Jul 2008 Posts: 30,465 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,465 Florida STAYcation	That IS the rubber seal .... so what do you mean ?

Re: SB TF727 issue - lost third and reverse [Re: dOc !] #774141 08/22/10 07:20 PM 08/22/10 07:20 PM
Joined: Jan 2003 Posts: 3,719 Space Station #5 471Magnum OP master
471Magnum OP master Joined: Jan 2003 Posts: 3,719 Space Station #5	No. It was a cast iron seal. I may have the description wrong. -Jim I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it. Currently Mopar-less

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