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Old 01-17-2012, 04:43 PM
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T-400 pump question

I had to replace the front bushing on my transmission pump, but when I took off the back half of the pump I noticed that the little marker on the outer gear was facing down towards the engine side. All the books that Iíve read, say that this marker should be facing up into the transmission like in the picture below. The transmission (I believe) has been rebuilt, because of the front color of the pump. I donít know if it was install that way at the rebuilt or from the factory. So should I install this gear the way it should be, with marker facing up or do I install it the way I found it with the marker facing down, or it shouldnít matter only the inner gear. I understand about wear patterns on these gears and such, but Iím just not really sure what to do about this situation. I checked clearances either way the gear is installed (outer) is good, .002. Any input would be appreciated.




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Old 01-17-2012, 06:02 PM
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ive seen it both ways. preferred would be with the dot facing the way it is in the pic you put up but, i have not seen that be a cause of pump failure if it was flipped over.
i will say that with what i do see that you look closely at the base of the pump body as the outer gear surface looks pretty bad from what i can see in the pic unless those arent the gears from the trans youre working on.
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Old 01-17-2012, 09:37 PM
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X2^^, poor machining finish.
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Old 01-17-2012, 11:16 PM
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Gears look toast to me.
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Old 01-18-2012, 09:52 AM
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Well damn it to hell, since I'm no tranny expert can you have a look at the rest of it and tell me if the entire pump it toast. The case look worse than it feels but like I said I'm no expert but I can read and follow a manual, but thats it.











Now I see what your saying.
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Old 01-18-2012, 01:36 PM
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yea, it looks like you need a pump body and a gear set. the stator side looks like it can be touched up from what i can see.
if you can drag your finger nail along where the gears ride and feel grooves then, you might as well get a whole pump assembly as both surfaces need to be smooth.
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Old 01-19-2012, 04:07 AM
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That pump is totally junk. None of the surfaces on the gears nor in the pump where the gears ride even begin to look like they should.

If you can run your fingernail across the wear surfaces and feel anything, the part is junk.
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Old 01-19-2012, 07:35 AM
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That does look bad. If you get a Remanned Pump, check it before installing it. Some are machined very poorly.
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Old 01-19-2012, 10:46 AM
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Ok Thanks guys. Well I guess it's rebuild time. No sence in putting in a new pump in an old tranny with 100k.

SS thxs for the tip.
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