Re: 727 rebuild questions, diaphram spring and wave springs
[Re: crash520]
#2486300
04/22/18 03:40 AM
04/22/18 03:40 AM
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Joined: Jan 2003
Posts: 25,941 Rio Linda, CA
John_Kunkel
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Joined: Jan 2003
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Rio Linda, CA
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Video claims the later piston isn't thicker but it is; the early 2124834 piston does measure .780" thick but the '74-later 3743623 piston measures .830". The thicker piston is needed because of the reduced cone height of the new Belleville. The later piston and Belleville were introduced to prevent the exact same failure mentioned in the video.
Use of the late piston and Bellevile along with replacing the wavy snap ring with the thickest solid snap ring (.106") makes the rear clutch a lot more reliable without the big bucks for the billet parts.
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Re: 727 rebuild questions, diaphram spring and wave springs
[Re: crash520]
#2486464
04/22/18 05:24 PM
04/22/18 05:24 PM
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Joined: Jan 2003
Posts: 25,941 Rio Linda, CA
John_Kunkel
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Posts: 25,941
Rio Linda, CA
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.012"-.015" per disc is the desired clearance so .060"-.075" is good for five discs with a flat snap ring.
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Re: 727 rebuild questions, diaphram spring and wave springs
[Re: FurryStump]
#2488385
04/26/18 06:05 PM
04/26/18 06:05 PM
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Joined: Jan 2003
Posts: 25,941 Rio Linda, CA
John_Kunkel
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Too Many Posts
Joined: Jan 2003
Posts: 25,941
Rio Linda, CA
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You're correct, we've had this discussion before; there are examples of "new" pistons with the new P/N that are the old dimension but my measurement was taken from an original 623 piston.
In the factory list of running changes for the '74 model year they list a new "N-D (Neutral-Drive) package" that includes the new Belleville and a new piston with "an increase in the over-all height".
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