GM Drivetrain & Suspension Chassis | Transmission| Driveshaft | Gears/Rear End/Differential | Traction Aids

Accumulator Pistons

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Old Jun 15, 2008 | 10:18 AM
  #1  
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Default Accumulator Pistons

I'm not sure if I spelled the name right but hopefully yall understand what I mean.

Anyhow, how difficult is it to swap out the plastic ones with some billet ones? Is this something a shade tree mechanic attempt to do, like the servos, or is it more indepth than that?

If I do take it to a shop about how many hours would they charge?

Thanks
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Old Jun 15, 2008 | 03:08 PM
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The one you'll have to worry about is the 1-2 accumulator piston. If you drop the trans pan, you'll see a sort-of round housing that looks like what's illustrated on the upper right side of the pic below (just to the right of the two solenoids - A & B):








*edit*

FYI... the 3-4 piston is a metal piston. I wouldn't worry about this one boring under wear & tear.


Last edited by 95ImpSS; Jun 15, 2008 at 03:16 PM.
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Old Jun 15, 2008 | 08:12 PM
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Thanks, the pics sure help out! So the stock 3/4 is already made of metal huh?
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Old Jun 16, 2008 | 07:03 AM
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Originally Posted by Champion201
Thanks, the pics sure help out! So the stock 3/4 is already made of metal huh?
Took a load of pics over the MANY times I've rebuilt transmissions. Search the Drivetrain section, and you'll see loads of threads by a LOT of users who've broken these open.

Yes, that one's a metal one. Unless you know of any seal damage (or otherwise), I wouldn't go beyond the 1-2. If you're looking to replace that one, you'll be dropping more than just the pan and 1-2 housing. Search the board for one of a few 4L6xE build-up threads. You'll get an idea of what's involved.
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Old Jun 16, 2008 | 08:23 PM
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Originally Posted by 1BADC10
Took a load of pics over the MANY times I've rebuilt transmissions. Search the Drivetrain section, and you'll see loads of threads by a LOT of users who've broken these open.

Yes, that one's a metal one. Unless you know of any seal damage (or otherwise), I wouldn't go beyond the 1-2. If you're looking to replace that one, you'll be dropping more than just the pan and 1-2 housing. Search the board for one of a few 4L6xE build-up threads. You'll get an idea of what's involved.
Thanks!
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Old Jun 17, 2008 | 07:42 AM
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If your replacing the 1-2 piston, you might as well change the forward piston too. It is plastic and breaks just as easy as the 1-2.
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Old Jun 17, 2008 | 11:15 AM
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Originally Posted by built408
If your replacing the 1-2 piston, you might as well change the forward piston too. It is plastic and breaks just as easy as the 1-2.
Since the pan would be down, good point. That can be found under the dark grey, bolted cap (top left of first pic). Have fun!
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