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Whats correct ST400 filter kit number?

Discussion in 'The "Juice Box"' started by UntamedKitty, Nov 30, 2014.

  1. UntamedKitty

    UntamedKitty Janitor

    Is a 1966 ST400 tranny filter/gasket kit the same as a TH400 kit?
    Thanx in advance.
     
    UntamedKitty, Nov 30, 2014
    #1
  2. CameoInvicta

    CameoInvicta Well-Known Member

    ST400 filter is different. WIX part number 58879, or equivalent, is what you need. My local Oreilly's was able to get it in stock the same day.

    [​IMG]
     
    CameoInvicta, Nov 30, 2014
    #2
  3. UntamedKitty

    UntamedKitty Janitor

    After some checking, I have found there is an idea out there that the 1966 ST400 uses the same filter and gasket as the 1966 TH400. But there are several other folks who tell me it is a different kit than the TH400. I have seen the one that CameoInvicta was king enough to reply with but wonder if the specific 1966 ST400 has any differences. Would the pan shape tell me one way or another as to which kit would be the best bet???
     
    UntamedKitty, Dec 3, 2014
    #3
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    All you have to do is look at the valve body. The later THM400 used a flat filter that used a shouldered bolt that threaded into the valve body. If there is no threaded hole in your valve body, you need the filter that was pictured in the 2nd post. It is possible to drill and tap the hole for the later filter. BTW, the ST400 was just Buick's name for their THM400. From 65-67, the ST400 was a switch pitch. The pan gasket is the same. The ST400 pan however has 3 dimples, and a shoe heel impression where the filter picks up the fluid. This article shoes the pan I am talking about.

    http://www.buickperformanceclub.com/switchpitch.htm

    The picture below shows the bolt that secures the flat style filter.
     

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    LARRY70GS, Dec 3, 2014
    #4

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