white3800camaro

iTrader: (6)

My dad and I just put my transmission back into my Camaro.
Test drove it and none of the shifts felt as firm and positive as they did before.


The changes made were:


New 3/4 clutch setup
2 5/8 wide band
77701-076 sonnax
Revmax 3600

Transmission was pulled due to a 3/4 issue.
Who ever put it together before had way way too much clearance, even before clutch wear.
Used a 8 disk 7 kolene steel setup

8 Friction with GPZ105

.215 Apply
8x .066 Friction GPZ105
7x .078 Kolene steel (TranStar part #74120AK)
.157 Backing
.092 Snap ring (stock)

was .032 wet after air check

Any help would be appreciated.

bwkmaro

did you have a stall before?

white3800camaro

iTrader: (6)

It was a 2500

But why would the converter make all the shifts feel like mush?

They used to brake 2nd loose or chrip it really well.

Revmax

A high stall converter will cause you to lose some shift firmness. The higher the stall speed the softer the shift.

white3800camaro

iTrader: (6)

A lot of people say I need to get it tuned, I had MAD tune it for a 3600, Should I still have it done/

mrvedit

I see you used my suggested 3/4 clutch setup.
As Revmax said, a higher stall will soften the shifts.

Do you have a 0.500 Boost valve in it?
This will firm up the shifts and reduce the chance of any clutches slipping.

The 2-3 shift will never feel as firm as the 1-2 shift anyway.

See this thread:
https://ls1tech.com/forums/automatic...-question.html

The suggested Sonnax boost valve can be installed after only dropping the pan and filter.

white3800camaro

iTrader: (6)

I have everything that came with the hd2 shift kit installed also.
So whatever boost valve that is.



I think it needs some tuning for the converter. It shifts, but feels like a weak stock transmission.

Under more throttle it feels like a cvt

mrvedit

The HD2 kit is excellent and has a 0.500 boost valve.
How many washers did you put into the 1-2 accumulator when installing the HD2 kit?

white3800camaro

iTrader: (6)

I believe it had three spacers in it. Like I said, it used to bang second, spin the tires a bit and even chirp sticky tires.

Now just mush.

Does just a tune seem realistic?

mrvedit

No. I have just two HD2 washers installed in the 1-2 accumulator in my current trans with a 2500 stall, and with light throttle where I have a programmed shift pressure of just "20" (max of 96) it chirps the tires. I've been reducing the programmed values until I can remove one washer or put my Yank 3600 back in.

I suspect you are losing pressure somewhere. Start by checking the line pressure with a gauge. Get a gauge ($45 on ebay) or have a trans shop check it for you.

white3800camaro

iTrader: (6)

I have monitored it with a scan tool.

Getting about 45 psi at idle in park.

At 3,000 rpm getting about 150 psi.

This is using my snap on scan tool. I can hook up a mechanical gauge later.
What is the procedure to do this?

mrvedit

The scan tool is not the real pressure - it is the "requested" pressure assuming a stock trans.
The driver side of the case has a "port" normally plugged. an 11mm or 7/16" wrench removes the plug. Then I think is is a 3/16" pipe thread.
Search ebay for a "Transmission pressure gauge" - you only need the single 300psi gauge. I have the "ATD-5550" one for $50.

devin.918

iTrader: (14)

I installed the hd2 kit in my stock tranny as well and it used to shift really hard and I installed my revmax 3600 and it almost feels as if it shifts stock its just your stall man.

white3800camaro

iTrader: (6)

I have a few oil pressure gauges. One goes to 300psi so that should work. I am sure it has the fittings. What am I looking for pressure wise? At what temp and what rpm?

mrvedit

My current trans with the Sonnax 0.500 boost valve runs 140 psi at idle in Park or Drive, and a max of 225 which occurs under acceleration or at idle in Reverse. The HD2 boost valve should be similar.

(Due to my experiments and mixing of parts, your idle_in_park pressure might be a bit lower, but should still be over 90.)

BTW - Where are you in Michigan? I am in Ann Arbor.

white3800camaro

iTrader: (6)

Brighton Michigan.
I will put it up in the air tomorrow morning and hook up the mechanical guage to it.

RevGTO

iTrader: (12)

Did you drill out the spacer plate feed holes when you installed the HD2? If so, what specs did you follow? You need more than Transgo's recommended specs when you're running a 3600 to get firm shift feel.

white3800camaro

iTrader: (6)

They're all at .093 like the kit called for.

mrvedit

I PM'ed you my phone #.
I assume you are mostly referring to the 1-2 shift. A 0.093 drill for the 1-2 feed hole should be plenty. If this shift feels soft, possibilities are low line pressure (which you are checking soon), a leak in the 1-2 accumulator such as a cracked piston or torn gasket, a leak in the servo, or excessive play in the band.

You mentioned installing the Sonnax 77701-076 Check valve. The instructions specify a .130 drill for the 2-3 apply hole for performance apps. (1/8" is .125 which is close enough) The orifice also needs to be drilled according to which servo you have. All this will only affect the 2-3 shift, which will always feel pretty soft with a 3800 staff. It should sound like a fast shift though.

I will wait for the result of your line pressure test.

white3800camaro

iTrader: (6)

The pressure was within spec.
Took the car to a tuner to see if it was the tune being the issue.

Still felt like crap.

Tuner agreed that it was not normal what so ever.
He sent me to a performance trans guy.

They suggested it could be a converter issue.

Since it is the only new part that is a component in all gear.
I had no issues before with 1-2 shift.

Has anyone had any similar issues?

They have my transmission out and are inspecting it.
Once they're done I will try the converter again. If it's the same mush, I will put my 2500 stall back in. If it fixes it that would rule the rest of the transmission out.