BennyB

iTrader: (12)

Ok so I have a lvl2 Performabuilt 4l60e that shifted and performed great up until my cam install and tune. I had the trans tune looked at and we had the trans shifting good again. I went to a 28 tall tire from a 26 and the 2-3 flare shift is back. I just recently had it looked at again had everything changed over for the 28s and it's a little better or not as noticeable, but it's still there. I should also mention I'm running a 4k stall and 430 gear out back. Any suggestions/ help is much appreciated. I'm at wits end with this pos 4l60e trans.

VIDEO ADDED POST #16

BennyB

iTrader: (12)

The car shifts great when cruising the flare only happens at wot. I'm hoping it's just in the tune again bc the trans only has about 2500 miles on it if that

BennyB

iTrader: (12)

Fluid looks and smells fine...

BennyB

iTrader: (12)

Damn no one?

mrvedit

The vendor should know how they built the trans and what could be done to reduce the flare.
Personally I would drop the valve body, drill the 3rd apply hole a bit bigger in the separator plate and install the Sonnax servo release check valve. The vendor might say that due to how they built it, my advice is wrong. Of course, even if correct, this might be much more than you want to do.
I'm no expert, but that is my opinion.

mrvedit

Also, I assume when you said the tune made it "a little better" that the tuner maxed the pressure during the shift. You could then also try increasing your line pressure with a stiffer pressure regulator spring, assuming you already have the max-sized 0.500 boost valve. Some stiffer springs are available, or "fix your own" by taking it out and stretching to a longer static length. Putting a pressure gauge on the trans is the best way to monitor what you are doing.

BennyB

iTrader: (12)

That's what I want hoping I would have to do. I don't know exactly thinking about taking the car back so he can get some more time with it at least. I want to be positive it's nothing in the tune

BennyB

iTrader: (12)

I've had other people tell me to put a gauge on it as well. Would I be able to do the same thing to monitor pressure in trans by logging it with up tuners?

performabuilt

iTrader: (25)

May sound a little strange but try adding between 1/4 and 1/2 quart of fluid you ideally want the level warm to be about 1/4 inch above the top of cross hatch. Never race or tune at WOT when cold.

performabuilt

iTrader: (25)

And Note the presure you log with HP tuners is not actual line but calculated line there is not actual presure sensor for line presure in the 4l60e.

mrvedit

First, glad that Performabuilt is giving advice too.
Especially because I first misunderstood your Q about pressure logging - the trans has no pressure gauge and the PCM only knows by how much the pressure control solenoid (force motor) is trying to increase pressure.
The typical gauge ($45 on ebay) has a 5ft hose and I have routed it to be visible on the outside of the windshield while driving. Use zip-ties to keep the hose away from the exhaust.

BennyB

iTrader: (12)

I will try that hopefully today or tomorrow

BennyB

iTrader: (12)

Ok yeah makes sense. I will look on eBay for a gauge today and hopefully be able to do some testing next week.

98TADRIVER

iTrader: (36)

back when i first started modding my C5, it would flare on the 2-3 shift when cold. then i added the 3400 converter &shift kit/tuned, it helped it out a bit. I would just take it easy when the trans was cold. I dont think i ever checked the trans fluid before the converter install. So when I did the converter/shift kit and refilled the trans, thats probably what helped it lol. C5's suck in that sense bc there is no dipstick and the car had to be up in the air so i could pull the fill plug to check.

BennyB

iTrader: (12)

Well tonight I'm going to take the car out and get the trans nice and warm, check the fluid to see exactly where I'm at and add fluid if need be to over fill the trans a bit. I'll let you guys know how it goes as soon as I'm done.

BennyB

iTrader: (12)

well i got the trans nice and hot (about 172 according to my aeroforce gauge) and checked the fluid lvl. The fluid level was above the cross hatch from what i could tell, i hate trying to read these trans dipsticks in these cars... The one thing i remember is i did re-mount my trans cooler and I did loose a little fruid doing that with disconnecting and re-connecting the lines. Even though the fluid level already looks a little high maybe ill try adding another half quart and see what she does. I also have a video i want to share of the flare shift at wot.


<iframe width="560" height="315" src="http://www.youtube.com/embed/10qgfVlYQvQ" frameborder="0" allowfullscreen></iframe>

http://youtu.be/10qgfVlYQvQ

BennyB

iTrader: (12)

Bump to top

mrvedit

Sorry, I don't notice much flare in your video.
I assume you don't have tuning software to log that it really is there.
What is the stall speed of your converter?

BennyB

iTrader: (12)

It wasn't bad in that video, but it's worse at times. It's a 4k stall

BennyB

iTrader: (12)

It not a fast or very firm shift for the 2-3 like the 1-2 shift is that's for sure