tranny problems suggestions

Well my tranny is acting up...I have called a few of you guys for advice and am just wanting more before I do anything...

The problem that has started is that everynow and then it shifts real hard from 1-2 and 2-3...almost as if the 2nd accumulator piston is sticking...When Tyler and I installed the shift kit we did notice that the piston was really tight on the pin so maybe thats whats causing it...Of course just the other day it got worse, it was shifting fine so I got on it on the freeway and low and behold got a p0894 code...(trans slip).

Questions i have...and no I havent dropped the pan yet(kinda scared to see if I broke anything)

1. drop pan and check the 2nd accumulator and possible just replace the pin and piston?(as recommended by Tyler)

2. Just go ahead and buy a built unit(wasnt wanting to do it just yet...still dealing with the Mrs issues.) (thanks Dale for the number to mike).

3. will the trans continue to slip worse and worse even if i drive like miss daisy?

You guys always have the best info so I would like to hear your thoughts.


My mods are in my sig.

Replace the EPC and wiring harness or just put a transgo 46mod vacuum pressure control on it and see if it fixes the issue?

sorry i didnt answer buddy but i was already asleep when you called last night....i left all the pressure tables stock in the trans....i say drop the pan and see if that helps anything out

if you get the tranny slip code on the freeway I doubt the forward accumulator is at fault. Did you guys replace the plastic one with aftermarket?

yes got rid of the stock plastic piece....

Guess I am dropping the pan this weekend...

Should have got a 80e :tacos:
Just messn with ya. Best thing to do is drop the pan, take a gander in there.

Your post describes a hard shift then talks about slipping. What gear slips? If it only hits hard 1-2 and 2-3 there may just be some debris in he valve body.

If you do not detect a slip but have the slip DTC, there may be a piece of debris elsewhere.

Pull the pan and look. Let's hope that's it like others have suggested.

I agree with the above, a 1-2 accumulator probably would not cause a slip (or undefined ratio) DTC.

thanks guys...gonna buy a new piston and pin and replace them just in case...anything else i should do while the pan is off?

well I have decided to just go ahead and get a built "danny" tranny....the stall should be here soon and hopefully this weekend with dannys help it should be in there...then i can tear apart the stocker to see wut is wrong with it.

Post up the autopsy.

My truck threw that code on the freeway but I was having a problem with my torque converter coming unlocked after the truck was driven for a few hours. My trans is gonna be taken out tomorrow and sent to FLT to take a look at it.

well my guess is as good as yours...itll get ripped apart and built back up for a fall back tranny

Here is some good info on that trouble code none the less.

Diagnostic Information on Diagnostic Trouble Code (DTC) P0894 and P1870 - Team ZR-1 Corvette Racers

wow thats some good info..after reading that im gonna bet a solenoid crapped out or is sticking. I 've heard that from a couple people already.