Transmission shudder in overdrive

[Ole Blue]

Right off the back if there's a thread or topic already that talked about this, I apologize. Last year I changed my transmission fluid with the deeper pan with a drain plug with the longer filter. Not too long after that I added a aux trans cooler. But just last weekend while I'm in overdrive on the highway going 60 the transmission to seem to jump in and out of overdrive. Since them I've had the lock up solenoid changes with fresh fluid and new filter, no help. I forgot who it was but ice seem a thread where some just did the shift kit and there problem went away. I just hit 170xxx so can't complain. I'm think of a rebuild kit or a new assembly from monster transmissions or should I try the shift kit? Any suggestions?

[v7guy]

I'd give the shift kit a shot first, they sometimes fix the shudder from my reading, the odds are the separator plate is pounded to shit too and you're likely leaking a fair amount of fluid around the holes. That in itself could cause some problems. For the difference in price between a rebuild and a shift kit it makes sense to give it a shot.

[Ole Blue]

I'd give the shift kit a shot first, they sometimes fix the shudder from my reading, the odds are the separator plate is pounded to shit too and you're likely leaking a fair amount of fluid around the holes. That in itself could cause some problems. For the difference in price between a rebuild and a shift kit it makes sense to give it a shot.

Yeah I guess it wouldn't hurt to try it. I was looking at B&m's improve shift kit or Oregon's performance shift kit.

[Ole Blue]

I'd give the shift kit a shot first, they sometimes fix the shudder from my reading, the odds are the separator plate is pounded to shit too and you're likely leaking a fair amount of fluid around the holes. That in itself could cause some problems. For the difference in price between a rebuild and a shift kit it makes sense to give it a shot.

I was thinking of trying B&m's or Oregon's shift kit.

[AA1PR]

is it related to torque converter lock up?

when this happens slightly depress the brake pedal & see if it goes away

[Trail X]

I don't know if those kits fix it, but I do known the transgo does. It fixed mine.

viewtopic.php?f=26&t=3022

[Ole Blue]

is it related to torque converter lock up?

when this happens slightly depress the brake pedal & see if it goes away

I recently had the lock up solenoid changed but didn't help but ill try the brake pedal tonight. I'll keep you updated. But would the the trans lock up if the torque converter is bad?

[Ole Blue]

I don't know if those kits fix it, but I do known the transgo does. It fixed mine.

viewtopic.php?f=26&t=3022

I'll look into it thanks. Also I think I read your post about you doing it and going away.

[JMHinAZ]

I'll second the Transgo shift kit. Based on my symptoms, James descriptions and results with the kit as well as my successful results with it. Do the brake tap test to see if it momentarily stops the flutter. I'll also throw in that this was the first time I had ever cracked the case on any transmission. worth a shot.

[NC_IslandRunner]

I noticed a great improvement after the transgo.

[Ole Blue]

So did the brake tap test last night on the hwy going 55mph, I could the transmission kick down to 4th but no hard bump. I'll orders a transgo kit from oregon performance this weekend, it's only $50 but doesn't come with a separator plate.
www.oregonperformancetransmission.com/m ... RG-SK4L60E

Should order I also get any servo kits or accumulators while I'm down there or just to see if this even fixes the problem.

[Trail X]

Not saying you shouldn't order the kit, but I'm not sure you understood what you were supposed to be looking for.

You need to get the truck in a situation where you're getting the shudder. Once you feel the shudder, keep your accelerator where it is, and with your left foot, tap the brakes just enough to light up the brake lights, but not slow you down. You're not looking for a hard bump or anything, you're just looking to see if after you tap the brakes the shudder is no longer present.

If immediately after you press the brake pedal the shudder goes away, you likely have a bypassing isolator converter valve, which makes the TCC flutter. The transgo kit should fix this.

Alternatively, if immediately after you press the brake pedal, the shudder is still present, then it is something else.

The PCM unlocks the TCC after the brakes are pressed, which is why this test works.

[Ole Blue]

Oh, sorry for the misunderstanding. I'll get on it.

[c0a8l0v6i8n9]

I suggest you buy the separator plate. Mine was already pounded at 70k

[Ole Blue]

Not saying you shouldn't order the kit, but I'm not sure you understood what you were supposed to be looking for.

You need to get the truck in a situation where you're getting the shudder. Once you feel the shudder, keep your accelerator where it is, and with your left foot, tap the brakes just enough to light up the brake lights, but not slow you down. You're not looking for a hard bump or anything, you're just looking to see if after you tap the brakes the shudder is no longer present.

If immediately after you press the brake pedal the shudder goes away, you likely have a bypassing isolator converter valve, which makes the TCC flutter. The transgo kit should fix this.

Alternatively, if immediately after you press the brake pedal, the shudder is still present, then it is something else.

The PCM unlocks the TCC after the brakes are pressed, which is why this test works.

So for the past few days I've been trying to do the brake test but it shudder isn't consistent and doesn't last long enough were I can tell if the brakes are helping or not. I will say that it is getting a little better. I looked on another gm forum and one guy said he bought a new transmission and still had the problem. Come to find out it was one dirt fuel injector. I looked at my fuel filter and man is it nasty with dirt and gas residue around it.

[Ole Blue]

I suggest you buy the separator plate. Mine was already pounded at 70k

Yeah I was thinking the same, can't hurt.

[Trail X]

So for the past few days I've been trying to do the brake test but it shudder isn't consistent and doesn't last long enough were I can tell if the brakes are helping or not. I will say that it is getting a little better. I looked on another gm forum and one guy said he bought a new transmission and still had the problem. Come to find out it was one dirt fuel injector. I looked at my fuel filter and man is it nasty with dirt and gas residue around it.

That's why the brake test is so important, it could be other things, we don't want you to have to go in the trans without a real good reason.

[Ole Blue]

So for the past few days I've been trying to do the brake test but it shudder isn't consistent and doesn't last long enough were I can tell if the brakes are helping or not. I will say that it is getting a little better. I looked on another gm forum and one guy said he bought a new transmission and still had the problem. Come to find out it was one dirt fuel injector. I looked at my fuel filter and man is it nasty with dirt and gas residue around it.

That's why the brake test is so important, it could be other things, we don't want you to have to go in the trans without a real good reason.

Could be the fuel filter and fuel system clogged a little? Either I'm changing the filter the filter this weekend, I've been running marvel mystery oil every other fill up for the past three years. But beside that, any other suggestions? Save for rebuild, upgrade to 4l80, or try the shift kit and new separator plate?

[v7guy]

I woulda figured with an 02 you'd already replaced the fuel filter.

I wouldn't rebuild unless it was trashed. But that's just me. If you do rebuild it's not much to swap out the parts to 4L65 or even 4L80 parts. http://www.4l60-e.com/

[Ole Blue]

I woulda figured with an 02 you'd already replaced the fuel filter.

I wouldn't rebuild unless it was trashed. But that's just me. If you do rebuild it's not much to swap out the parts to 4L65 or even 4L80 parts. http://www.4l60-e.com/

I was looking at some of these transmissions.

https://www.monstertransmission.com/mob ... Cat_4041_1