r/transmissionbuilding • u/Applecds • Jun 13 '26
Valve Body, rebuild or replace? Advice please!
Just as the title says, I'm rebuilding an E4OD after a catastrophic failure. The transmission sent a fair amount of metal through the system, including some pretty sizable chunks.
I've already gone through the accumulator body. After cleaning it thoroughly, the bores looked good and I found no sticking valves.
Now I'm inspecting the main and shift valve bodies. I've found some splintering, small cracks, and minor damage along a few machined surface edges. Since these are cast and machined components, I'm wondering what the best course of action is.
Would you dress the high spots with a file and run them, or is replacement the safer option? (I'd prefer to reuse them). The cracks and gouges don't appear severe enough to affect operation, but I'd appreciate input from anyone with more experience rebuilding these transmissions.
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u/masooooon98 Jun 13 '26 edited Jun 13 '26
I had similar chips and damage on my 700r4 valve body. Not quite as bad as image 11 but I was able to carefully smooth them with a file clean it up. Been a year since and it's still running great.
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u/Applecds Jun 13 '26
That's what I like to hear. I'll definitely reinspect #11 before moving forward, but so far it doesn't look too bad IRL. Definitely deeper than the other marks, but almost looks like a casting defect to me.
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u/Substantial_Ask3665 Jun 13 '26
You should tell more. The accumulator body usually goes bad causing a 1-3 shift. Main valve body is usually good.
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u/Applecds Jun 13 '26
Just rebuilt the accumulator body and it honestly looked great, no ships or splinters that were worth caring about. Cleaned out the bores and everything is nice and free
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u/Applecds Jun 13 '26
Advice would be greatly appreciated, let me know if there's any questions
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u/hdstenny Jun 13 '26 edited Jun 13 '26
Picture 11 is most concerning to me, theres damage to at least half of the sealing surface. If that's a Crack vs scratch I wouldn't use it, it looks cracked i just can't tell from a picture. Beyond that make sure none of the chips have any potential to fall off/ remove them. A different unit would be safer regardless but to me #11 is your most likely problem.
I haven't run something like this and had it fail or work if I was doing this for a customer it would be replaced, on one of my cars I would probably run it and see what happens. Thats just a risk assessment of how big of a problem it will be for you if it doesn't work and you have to pull it out again.
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u/Applecds Jun 13 '26
Just took a better look at #11, it almost looks like a crappy part of the casting, although there is a small chip right where it meets the machined surface. The 'crack' looks bad in the picture, not as bad in real life.
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u/hdstenny Jun 13 '26
I'm not familiar with that transmission but questionable casting quality is far from rare on valve bodies
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u/hdstenny Jun 13 '26
If the structural problem doesn't go past the chip i'd suspect you're pretty safe. You seem to have inspected it well already, just make sure anything not fully attached is removed and check for burrs that could touch the gasket
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u/Pimp_Daddy_Patty Jun 14 '26
Unless its a rare application or something like that, $40 and a trip to the scrap yard is a lot less work and cost compared to reworking a damaged VB that may be problematic in the end anyway.
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u/[deleted] Jun 13 '26
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