Low/Reverse Piston

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Low/Reverse Piston Empty Low/Reverse Piston

Post  460bronco on October 30th 2013, 1:10 pm

My Low/Revers piston doesn't have the check ball. What advantages would there be to finding one with the check ball if any for my re-build? I'm trying to follow Frank's build sheet as closely as possible!
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Post  J.Toney on November 4th 2013, 12:44 am

From what I know/think, it'll help the piston potentially release faster when its turned off, basically a bleed. I just drilled a .030 hole for the same effect. I've also ran them with no hole, no problems with them as of yet. These are on non AND transbrake apps.
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Post  460bronco on November 4th 2013, 8:55 pm

I've never laid eyes on one of these old style pistons... Do you know if there are any dimensional differences besides the checkball.. Such as height?

Just me thinking here--- I would prefer the circuit without a bleed hole... Seems like the checkball/ added bleed hole would just lower the apply pressure and potentially make it easier to slip the clutch??
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Post  J.Toney on November 4th 2013, 10:32 pm

From what I've seen, all low-reverse pistons interchange. But the hole and retainers can be different. As far as the bleed, there is more than enough oil back there to apply the clutch. It's not a 1" hole, just a controlled bleed to help the piston return when feed oil is lost. I've run them both ways, but with the hole makes me feel better in a scenario where the clutch is applied in manual low, and needs to overlap with the band on a 1-2 shift. 
My .02
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Post  Frank Merkl on November 13th 2013, 8:36 pm

The new style piston ie; with no check ball is shorter so you have to use the wave plate in the low/reverse
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