Did I break My Automatic Transmission Pump

Posted by webconnect, Mar 21, 2009
Automatic Tranny - 4G63 automatic tranny discussions. Sponsored by Import Performance Transmissions

  1. webconnect

    webconnect Proven Member

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    San Antonio, Texas
    Hi guys. I recently did my own engine rebuild. It started up fine, however my car wouldn't move and it was buzzing pretty bad.

    So, found out that my method of installing the tranny (sucking it up with the bolts) is not the way to do it. HA. Anyways, I took my engine back out and took off the tranny oil pump assembly. However besides two places where it looks like 2 tabs broke off, nothing looks out of the ordinary. I did find the tabs broken off. What do I need to buy?

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  2. Morphius

    Morphius DSM Wiseman

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    Post a pic with it circled with the tabs you are referring to? From what I see, I don't see anything broken. The casting in your first pic that is in the palm of your hand with the gasket, is the pump. Internal to it, is a the pump gears. The later pic, you show pics of the front clutch.
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  3. jram53

    jram53 Proven Member

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    i had the same problem mine was my pump and TC could be something else for you...i saw this as a time for upgrades...might want to look into rebuilding your trans saves alot of headaches.
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  4. webconnect

    webconnect Proven Member

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    San Antonio, Texas
    Thanks guys.

    I figured out that you had to slide that top part off of the oil pump to get to the oil pump (in the 1st pic) :D

    Yes my inner oil pump gear is messed up. :notgood:

    Anyways, I circled to what I "think" is broken off tabs, although now that I am looking at it, I think it is just the design.

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  5. Dsmj89

    Dsmj89 Proven Member

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    Looks perfectly fine to me..
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  6. Morphius

    Morphius DSM Wiseman

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    Those are just casting marks from flash removed or casting runners that were removed before it was machined. Mine look identical.
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  7. SBR Joe

    SBR Joe Proven Member

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    I hate to bring this back from the dad, but to the OP, did you have the tq converter in the tranny before mounting it to the block? Or did you have the tq converter bolted to the flex plate then tried bolting the tranny to it?

    Only reason im asking is because im running into a possible scenario thats the same....but i did witness by friend F his pump up by trying to do the same thing, because he had the tq converter on the flex plate, and all the splines werent lined up when he tried to suck it on with the bolts.
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  8. the_mork

    the_mork Moderator

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    The torque converter goes in the transmission, and it needs to be moved around until it settles in a couple of times if it only settles in once then you're still going to break the pump. the torque converter should be about 3/4" or more inside the lip of the bell housing to mount it up. You'll know when you break the pump because it makes a loud popping noise when it goes. One test of whether or not you're okay is to use a wrench to turn the engine once the bolts are started and if you can get it to move to add the flex plate bolts then you're fine, but if it binds then the torque converter is smooshed in where it shouldn't be and you need to back off to get the TC right.

    At least the pump is easy to change if you have a spare transmission laying around.
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