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J-type overdrive valve body differences 120-130

posted by  malloy1 on  Sun Jun 19 09:49 CST 2011
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last visit: Sun Oct 12 17:44 CST 2014
[RELATED]

Were there 3 or 2 different valve bodies designs? I see '76 to June '83 and May '83 to '93, but what about before '76?

Is the relief valve the only difference? Are the parts interchangeable (Can you put any year relief valve assembly into any year valve body)? Are all the O-rings interchangeable?

I remember a couple of years ago using two overdrive units to make one good unit, and the valve body I used was from a later ('76-'83) OD unit, and I mixed it with an earlier (pre-76) OD unit. The unit works perfectly to this day (M41).

Paul






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