Re: 727 problems HELP!!!
[Re: 71RTC]
#1195099
03/11/12 12:51 PM
03/11/12 12:51 PM
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Joined: Jan 2003
Posts: 16,932
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,932
NC
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The rear band is applied in reverse and in "1" or "L" with a factory valve body. But not in "D". So first gear will work even if the rear band doesn't engage, but reverse won't. With the shifter in "R", the front clutch is engaged, the rear clutch is disengaged, the front band is disengaged and the rear band is engaged.
Air test the rear servo for excessive leakage, and look for rear band to servo linkage issues. You can pull on the rear servo lever by hand and check for proper movement, no binding, etc.
Also check the shifter, shifter linkage, etc.
Last, it could be some valve body issue? Swapping a known good one for a check.
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Re: 727 problems HELP!!!
[Re: 71RTC]
#1195101
03/11/12 03:30 PM
03/11/12 03:30 PM
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Joined: Jan 2003
Posts: 26,005
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,005
Rio Linda, CA
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A little more info on the trans would be helpful.
In some cases, when the valve body is modified, the large check ball is mistakenly omitted...this will cause no Reverse with all forward gears OK.
The INTERNET, the MISinformation superhighway
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Re: 727 problems HELP!!!
[Re: 71RTC]
#1195106
03/11/12 04:15 PM
03/11/12 04:15 PM
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Joined: Oct 2010
Posts: 2,408
Ambridge, Pa.
rickraw
top fuel
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top fuel
Joined: Oct 2010
Posts: 2,408
Ambridge, Pa.
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u have to hold the transbrake button in to backup with a probrake vb. seeya.
Last edited by rickraw; 03/11/12 04:19 PM.
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Re: 727 problems HELP!!!
[Re: Leigh]
#1195107
03/11/12 08:05 PM
03/11/12 08:05 PM
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Joined: Jan 2003
Posts: 16,932
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,932
NC
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Quote:
Also, if the accumulator piston has beeb blocked with a rod, make sure the length doesn't prevent the valve body from seating fully against the case.
Good thing to check. It doesn't take much, and simply removing the blocker rod and trying it will tell you. (valve body R&R required to get at it).
To air test the rear servo,
- remove the valve body
- using 30-60 psi of shop air and a rubber tipped nozzle, pressurized the port shown.
- some fluid will leak, but the servo should actuate and engage the rear band (visual movement).
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