tranny issue, need some help figuring it out

[Tig]

Thanks kewl, I appreciate the help/info

fastest,
It was originally and still is happening going into 4th/OD. It was a slight shudder but noticeable, it seems to be more pronounced after the new converter was installed.
Now, it does it going roughly 30/35mph and it also makes a rattling sound, like metal is rattling together.

When I went for a ride with one of the mechanics before everything was installed to diagnose the situation, we were at a red light and it had a rough spot in the idle. It did it a couple of times. I asked "did you feel that" he replied "yes" I asked "could that be a mis" he replied "no, its just old". I didn't say anything back but was like WTF is that supposed to mean. Its an 07 not a 97.
From all the info I have been gathering, a mis can cause the converter to unlock and also cause a shudder.
I bought new plugs and wires, I'll be installing them today or tomorrow.

[blacstar]

when the old plugs are out, check the gap. it should be .040 to .045 inch if n/a

[Tig]

Thanks blacstar, I appreciate the info.

It rained for most of the day, I couldn't get the passenger rear out before dark. Is there a trick to this? Seriously?

Pulled the plugs-n-wires in the order laid out. 1 and 7s prongs were stuck to the plugs.
I checked all gaps on used plugs, they ranged from .47 to .50. All new plugs (AC Delco 41-110) were all gapped to .45. I hope this is not a problem, from all the info given they should be .40.

[blacstar]

yeah its a lil limited on space. on some you can go thru the wheel well.

[Tig]

Well, finally finished my plugs n wires. That rear passenger plug kicked my ass all over the place, haha.

Unfortunately it did not resolve my shudder/vibration. Though from the limited amount of driving I did, it did get rid of that rough spot in the idle.

Someone had mentioned "replacing the TCC valve in the valve body with on on/off valve, e.g. the Fitzall. Most (all?) aftermarket converters prefer an on/off valve anyway."
I'm not sure but I had a Transgo shift kit Jr installed, not sure if that replaced said part with said part, hah.

I am not sure what to do now. I may have to give in and bring it to a dealer for them to scan it.
Any ideas?

[farmtruc]

tcc solenoid isn't in the valvebody, it's towards the front of the trans but accessible with the pan removed.
instead of replacing it; have the diag guy command full lockup and look at pressures with the scanner.
a lot of stuff can be done before tearing into something; saves tons of money and you get closer to the issue.

key is; having someone competent enough to do all this with the right tools. i know that's tough to do.

[Tig]

I ended up bringing to a locale dealer.
I was fortunate enough to drive it with there lead tech. He felt and heard everything through every gear. THANKFULLY, hah.
He in turn took it out with another tech and a scan tool.


I'm going to wait until Monday to hear back from the shop for there results before I jump to conclusions.
They will get me a new converter if need be.

[jaysonolson]

it sounds to me like you need a new transmission. i went through about 10 4l60e.

[Tig]

Well, thankfully I don't need a new tranny.
The torque converter was the original problem. It was also the reason for me to think I had 4:10 gears.
It never locked up and I was cruising at 2200rpm at highway speeds when I should've been around 1600.

Now onto problem number 2 why it was shaking after the new parts were installed.
Turned out to be the displacement on demand/active fuel management, awesome.
That has been tuned out

I will have my car back tomorrow, finally.

[Tig]

Got it back.
Not only did they put 70+ miles on my Tahoe, they used ALL of my gas and didn't replenish any of it, nice.
Driving to the gas station, it happened again. I'm at a loss for words.
Its weird, when its cold nothing happens. When it warms up the converter seems to lock up around 35mph, it shakes and rattles pretty loud until I get over 43/45mph or I get on the gas. It also has a drone.
I will not be going back.
I got in contact with an actual transmission shop referred to me by a friend and am in the process of making an appointment.