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Old 01-21-2014, 06:30 AM
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Race T-400 Pump Question - Casting Numbers

I have a race transmission that is new and in good working order. Nothing in the pan what so ever, fluid is clean. Has 230 PSI line pressure at 2000 rpm. The probelm is that it feels slugish, everything works but is about 1/2 off from where the car used to run. I was wondering if I could have a pump where the casting numbers do go together. It has a 895 front half and the rear half is not an 896? I have heard if you use the wrong sides that the trans will work and have good pressure but not work properly like as in this case. Does anyone have a pump casting number breakdown saying which casting numbers can be used together?

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Old 01-21-2014, 11:09 AM
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If you have an 895, then you MUST have a matching 896.

Yes, I do have a pump listing showing which numbers fit what, but forum rules prevent me from posting a link. Sorry.
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Old 01-21-2014, 05:56 PM
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the 895 pump casting will work with multiple stator / pump covers.

What happens with mis match is run away pressure due to the PR valve getting hydraulically locked in place, unless a proper vented PR valve is used.

I doubt the pump is slowing the car down a 1/2 second; if that is what you mean
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Old 01-22-2014, 09:30 AM
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This is in a 3000 lb camaro with a small block and in good air with a different th400 and 4500 stall it would run 10:90's. With this TH400 and a 2 different 5000 stall converters one by TCI and one by Hughes the best the car would run is 11:30s-40s. The original transmission was pulled to put a glide in the car. The car runs faster with the glide with either converter, 11:20s. The 60 ft is faster with the glide than this th400. Off the line the car is sluggish, 2nd gear hit is not even felt. Has 230 psi line pressure with a coan spring. It has a BTE billet transbrake. All clearances were set properly and I used a reman pump from transtar. The transmission internally looks happy no metal, no clutch material in the pan, nothing! Maybe I gave the best combination available trying to make the car faster?
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Old 01-22-2014, 06:05 PM
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what you describe, makes me wonder if the converter is fully charged with fluid.

With a high pressure main line , sometimes the cooler feed is reduced if the pump is not up to the task (loose fitting gears)
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Old 01-27-2014, 06:36 AM
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Well I guess I will put a new pump in it and see what I have got.
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Old 02-03-2014, 10:48 AM
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well I went back through this. Installed new bushings, thrustwashers, seals. Reclearanced the clutch packs. I do have one question there is a bleed hole in the intermediate support that leaks when you apply air. Does anyone plug this hole off or leave it open? When you manually plug the hole with your finger there is no leaks. In the instructions it has you drill a 1/16 hole in the direct drum for transbrake release. I think the instructions would state to plug this off if it was necessary but I just wondered?
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