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727 Low Reverse Servo Question
#1339217
11/21/12 09:54 PM
11/21/12 09:54 PM
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Joined: Jan 2007
Posts: 404
Central New York
bfury
OP
mopar
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OP
mopar
Joined: Jan 2007
Posts: 404
Central New York
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Are all the rear (low/reverse) servos in the '71 up 727's the same size? We have a cracked one and looked at some from other 727's that look different.
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Re: 727 Low Reverse Servo Question
[Re: bfury]
#1339219
11/22/12 11:05 AM
11/22/12 11:05 AM
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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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It is my understanding that the 1967-1978 are the same. The ones newer than 1978, I am not sure about. I agree the billet (rather than cast) aftermarket ones are a good upgrade. Many also come with a HD (extra thick) retainer; the stock one can be bent and allow the servo to pop out. Sold by CRT, and mrRandyJ in the Moparts.com parts for sale section. Less than $100 with a one-piece billet servo (no spring), HD retainer, HD spring. https://board.moparts.org/ubbthreads/show...rue#Post7443374If using a stock one, shim the servo as close to solid as you can (no spring travel).
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Re: 727 Low Reverse Servo Question
[Re: bfury]
#1339220
11/23/12 12:33 PM
11/23/12 12:33 PM
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Joined: Jan 2007
Posts: 404
Central New York
bfury
OP
mopar
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OP
mopar
Joined: Jan 2007
Posts: 404
Central New York
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Thanks for the help. This trans is in a 4 wd plow pickup. Don't know if that makes a difference.
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Re: 727 Low Reverse Servo Question
[Re: bfury]
#1339221
11/23/12 12:37 PM
11/23/12 12:37 PM
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Joined: Jan 2003
Posts: 75,012
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,012
U.S.S.A.
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Quote:
Thanks for the help. This trans is in a 4 wd plow pickup. Don't know if that makes a difference.
no it doesn't .
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Re: 727 Low Reverse Servo Question
[Re: bfury]
#1339222
11/23/12 01:26 PM
11/23/12 01:26 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:
Thanks for the help. This trans is in a 4 wd plow pickup. Don't know if that makes a difference.
From what I know, many pickup plow drivers shift from Drive to Reverse and back often. If not careful, this is hard on the rear servo. And shimming the servo solid takes away the cushioning effect, which might be a double edged sword. i.e. it doesn't slam the piston plug against the piston, but the solid servo might shock the strut, etc. I am not sure.
So for that application, although a billet servo is not likely to crack like a cast factory part;
I wonder if a Sonnex billet servo that retains the cushion spring assembly might be a better way to go?
These are only about $15. Transmission Technologies
They list one for the older 727s (22912), one for 1994-1996 (22912B) and another for 1997 and newer (22912C)
http://www.sonnax.com/system/instructions/22912-IN.pdf
And Superior makes this "super servo" with features to resist cocking in the bore.
transmissiontechnologies.com Transmission Technologies
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Re: 727 Low Reverse Servo Question
[Re: 440Jim]
#1339223
11/23/12 02:58 PM
11/23/12 02:58 PM
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Joined: Jan 2003
Posts: 25,802
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,802
Rio Linda, CA
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The only time a rigidized rear servo piston is an advantage is on a manual 1-2 upshift; if you don't do manual upshifts often, you're better off leaving the unmodified rear servo because it's easier on parts....especially in a vehicle that changes direction often.
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