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Re: Rebuilt 727 no reverse!
[Re: dragram440]
#954586
03/20/11 10:42 PM
03/20/11 10:42 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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Quote:
I just got my car fired back up with the rebuilt trans, converter,cooler and lines and got it filled up with fluid all gears work except reverse? Any ideas? I havent got ahold of the tranny guy yet. He is 4 hours away from me! 
The low/reverse band circuit is the problem. Look at the rear servo,rear band strut, or a valve body issue. The servo and band can be air checked with the valve body removed. You may find a cocked or broken piston,missing band strut,or incorrect adjustment. As metioned some trans brake valve bodys need the brake applied to engage reverse.
Good luck Doug
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Re: Rebuilt 727 no reverse!
[Re: dragram440]
#954587
03/20/11 11:04 PM
03/20/11 11:04 PM
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Joined: Jan 2007
Posts: 345
iowa
wesw
enthusiast
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enthusiast
Joined: Jan 2007
Posts: 345
iowa
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if it has a trans brake you have to push the button for it to go into reverse
598 ci predator
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Re: Rebuilt 727 no reverse!
[Re: dvw]
#954588
03/20/11 11:07 PM
03/20/11 11:07 PM
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Joined: Mar 2009
Posts: 1,058
bigfork mn
dragram440
OP
super stock
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OP
super stock
Joined: Mar 2009
Posts: 1,058
bigfork mn
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The tranny is a 727 with a full manual turbo action cheeta reverse pattern shift no engine brake in 1st no trans brake coan 8" converter.
67' charger 499 RB
10.57 at 127
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Re: Rebuilt 727 no reverse!
[Re: dragram440]
#954589
03/21/11 08:27 AM
03/21/11 08:27 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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I bet you have a ripped rear servo seal. Chyeck line pressure with air and see if you hear air leaking out the rear servo.
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Re: Rebuilt 727 no reverse!
[Re: dragram440]
#954590
03/21/11 08:28 AM
03/21/11 08:28 AM
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Joined: Oct 2005
Posts: 1,927
Seaford, Va
Kindafast
top fuel
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top fuel
Joined: Oct 2005
Posts: 1,927
Seaford, Va
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I had the same problem once. I pulled the transmission 3 times to find the problem. I finally found the pump was different , I don't know what darn difference there was but I changed it and that fixed it. Good luck.
6.50 @105.26
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Re: Rebuilt 727 no reverse!
[Re: 383man]
#954594
03/21/11 03:41 PM
03/21/11 03:41 PM
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Joined: Mar 2009
Posts: 1,058
bigfork mn
dragram440
OP
super stock
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OP
super stock
Joined: Mar 2009
Posts: 1,058
bigfork mn
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I havent driven the car but it stalls higher in secound and higher in yet third in the garage. Still to much snow and mud to drive it.
67' charger 499 RB
10.57 at 127
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Re: Rebuilt 727 no reverse!
[Re: dragram440]
#954595
03/21/11 09:49 PM
03/21/11 09:49 PM
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Joined: Jan 2003
Posts: 25,785
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,785
Rio Linda, CA
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I would pull the pan and look for obvious distress in the rear servo and band linkage. If there's nothing obviously amiss pull the VB and air test the rear servo.
The INTERNET, the MISinformation superhighway
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Re: Rebuilt 727 no reverse!
[Re: dragram440]
#954596
03/22/11 10:53 PM
03/22/11 10:53 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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Quote:
Quote:
Quote:
I just got my car fired back up with the rebuilt trans, converter,cooler and lines and got it filled up with fluid all gears work except reverse? Any ideas? I havent got ahold of the tranny guy yet. He is 4 hours away from me!
The low/reverse band circuit is the problem. Look at the rear servo,rear band strut, or a valve body issue. The servo and band can be air checked with the valve body removed. You may find a cocked or broken piston,missing band strut,or incorrect adjustment. As metioned some trans brake valve bodys need the brake applied to engage reverse.
Good luck Doug
Can I see all that by pulling just the pan or do I have to pull the valve body or should I just pull the trans back out and start from there? [/quote
Yes the valve body would have to come out. All bands and clutches can be tested with air. My diagnosis was based on the fact that 3rd gear works correctly. If not I would air check the front clutch passage. 3rd and reverse both use the high/forward clutch . The low/reverse band is only used in reverse with a Chettah valve body.
Doug
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Re: Rebuilt 727 no reverse!
[Re: John_Kunkel]
#954598
03/23/11 10:00 PM
03/23/11 10:00 PM
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Joined: Jan 2003
Posts: 16,925
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,925
NC
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Quote:
I would pull the pan and look for obvious distress in the rear servo and band linkage. If there's nothing obviously amiss pull the VB and air test the rear servo.
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Re: Rebuilt 727 no reverse!
[Re: 440Jim]
#954599
03/28/11 11:24 AM
03/28/11 11:24 AM
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Joined: Mar 2009
Posts: 1,058
bigfork mn
dragram440
OP
super stock
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OP
super stock
Joined: Mar 2009
Posts: 1,058
bigfork mn
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So I pulled the pan and the reverse servo lever is completely free swinging, so im guessing the rear band is broken or off and the lever doesnt seem to line up with the center of the servo.My tranny guy said it was nothing that he did wrong? Not sure why this happened! The tranny has 0 miles on it! Time for a new tranny guy. Now that I have had him do this one twice now with a total of 8 passes on the first one and 0 on this one.
67' charger 499 RB
10.57 at 127
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