LSX454 swapped 95 BASS burb.

[folkenheath]

Its possible the spring wrap was just absorbing some of the problem and now that is rigid and the problem feels worse.

I think you need to check your shock bushings, they should be very tight, and your motor mounts, trans mount, and spin your axles and driveshaft to make sure there is no binding.

I think its in the trans, and or your shocks. It even does it on decel sometimes.

 

[Babaganoosh]

Just for my own sake of knowledge because I don't know.

Is this a 95 wired trans meaning it's not like a "LS" trans that would be controlled by a 0411 ecu? I wonder if that is why it's a bit screwy with the programming? Although I'm sure in the holley drop down menu you can select that gen of transmision I don't have it in front of me on this laptop.

 

[folkenheath]

Its a 4L80E, not a 4L60E.

4L80E didn't have all those changes you are referring too.

 

[Babaganoosh]

Its a 4L80E, not a 4L60E.

I figured that was going to be the answer, but wanted to ask.

 

[folkenheath]

I sent the short 8 second video and a screen shot of the datalog to my trans guy, the one who built the converter and also builds trans for a living, he said this...

If it's a converter shake you'd see it on ISS first.
If it doesn't shudder in neutral under no load, its not an engine or converter issue. That video looks like driveshaft bind/wrap. It will shake the truck apart and/or break the transmission

Now, he doesn't have the whole story, only a quick summary, and that statement is not true for some applications, but he is also basically saying check your axle, driveshaft, and suspension.

I say motor mount's too the way it shook your shifter.

 

[shady]

Motor mounts were perfect when this motor went in. Trans mount is new too.

Rear shocks have some issues at the lower bushing.
But it don't appear to be in the part around the actual bolt. More like the 1/4" on the outside.
When I put these in I couldn't use the metal sleeve so that came out and it's just a fat bolt through the rubber.
ill get it on the lift and see what I can do at them.
Leaf spring bushings are all perfect.
There IS a wiring harness difference in the 4l80e, but 95 is like a split year. Half got the old half got the new or something. I have the newer style harness.

Only thing changed in the trans was the speed sensors while it was out. With good ones.
Any chance there's an issue with one of those that could kick a solenoid in and out or something.?

 

[shady]

The last time I had it in the air I spun the wheels and didn't feel anything out of the ordinary.
I have the stuff to change the gear oil because I wanted to re check my pattern and backlash.
So I'll look for any internal issues at that point.

After that I'll get another vid underneath and see if the caltracs are doing their thing.

 

[folkenheath]

Motor mounts were perfect when this motor went in. Trans mount is new too.

good to hear

Rear shocks have some issues at the lower bushing.
But it don't appear to be in the part around the actual bolt. More like the 1/4" on the outside.
When I put these in I couldn't use the metal sleeve so that came out and it's just a fat bolt through the rubber.
ill get it on the lift and see what I can do at them.

sounds like a plan

Leaf spring bushings are all perfect.

good

There IS a wiring harness difference in the 4l80e, but 95 is like a split year. Half got the old half got the new or something. I have the newer style harness.

93 and newer have the new harness, but most people just put the new harness in if they have an older trans. That doesn't effect what he was talking about.

Only thing changed in the trans was the speed sensors while it was out. With good ones.
Any chance there's an issue with one of those that could kick a solenoid in and out or something.?

I suppose that's possible. This could also explain why the Diag #6 was giving you the error previously, which was strange, but you would have to call Holley on that one. I would think if it got those errors it would go into limp mode and stop shifting and be stuck in 2nd gear, but I don't really know for sure what would happen.

 

[shady]

I think its in the trans, and or your shocks. It even does it on decel sometimes.

Not sure how it looks in the logs, but it has never done it on decel that I have felt. Not even a little or a tad.
The only time it ever does it is when I have my foot on the gas. I may be accelerating less than I was moments before, but I am in the pedal with a load on it every time I have ever felt it.

 

[JoshHefnerX]

If it's not doing it under hard load I'd think the trans is prob safe.

I will say I had a problem with driveshaft angle when I swapped an aam 10.5. It would shake like yours. Felt like I was riding a paint shaker from home depot. Maybe double check your driveshaft/ujoints/pinion angles and everything is tight.

 

[folkenheath]

Not sure how it looks in the logs, but it has never done it on decel that I have felt. Not even a little or a tad.
The only time it ever does it is when I have my foot on the gas. I may be accelerating less than I was moments before, but I am in the pedal with a load on it every time I have ever felt it.

Here it is in the log, circled in orange, not as bad, but there....



here it is in your video, 7 seconds, the TPS is at 0 and it does it again...

View attachment 507952

 

[folkenheath]

Ok.
So when mine was shuddering in 2nd and 3rd and was cured from the fluid Greg advised to use and it went away, could it be making the fluid passages clear so the pressure is more consistent?
I am trying to understand what my issue was and if his is similar.
Mine was a 4l60e which I am sure is the same as 4l80E

Was it transmission or converter shudder at that time? Could of been transmission. However, there was also some years where they actually tried to slip the TCC on purpose, to smooth things out, and that resulted in a lot of heat and failures before they made some upgrades and changes. I do not know the details of this, I just remember reading it when I was researching the 4L60E differences. Next week I'll be putting a shift kit in one to drop behind a 388. I've puta shift kit in a 700R4 before but that's been over 2 decades. I have only 100% rebuilt TH400s and 4L80Es, I am definitely not a transmission expert.

Rick is not trying to slip the TCC with his.

 

[shady]

I never noticed that. That'd be the only time I know of.
In order to lessen the 1-2 hit, which is way softer than before for some reason , I lift the pedal for the shift then get back in it after the shift, and that's when I always feel it. Never in any other gear and the only time I've felt it in first was the one in that log I think.
Possibly a few times before the shift maybe I guess.

The shift thing seems important.
It started shifting 1-2 quick and stiff yet, but WAY softer than before. The violent explosion feel is gone.
It's almost a normal shift now. With the duty cycle at 5 across the board.
Before it was teeth jarring when I let off for the shift and had the duty cycle at 30.

 

[shady]

That one you circled I was maintaining speed going up hill. So still under load.

 

[folkenheath]

I never noticed that. That'd be the only time I know of.

Did that happen to be on a downshift you think? Or just something upset it from the road?

In order to lessen the 1-2 hit, which is way softer than before for some reason , I lift the pedal for the shift then get back in it after the shift, and that's when I always feel it. Never in any other gear and the only time I've felt it in first was the one in that log I think.
Possibly a few times before the shift maybe I guess.

The shift thing seems important.
It started shifting 1-2 quick and stiff yet, but WAY softer than before. The violent explosion feel is gone.
It's almost a normal shift now. With the duty cycle at 5 across the board.
Before it was teeth jarring when I let off for the shift and had the duty cycle at 30.

Yes, ever since the engine swap something changed with the trans, you used to say it was going to break something, then all the sudden you have to turn the pressure up or it's slipping, I agree.

That one you circled I was maintaining speed going up hill. So still under load.

You are correct, you lowered the load but the load was still there I suppose. It did it on the shift is what it did.

However, the shift could also be upsetting the suspension if there is something loose.

But the major changes in the transmission still throw a red flag to me.

 

[Blue85]

It does seem like it's winding up a spring. The RPM shoots up fast, then goes flat for a while before the "real" acceleration begins.

 

[shady]

That's where the converter catches.

 

[Blue85]

That's where the converter catches.

Well, maybe. The only difference between RPM and input shaft speed is whatever the converter is doing. If input shaft speed is constant while vehicle speed is increasing (i.e. 2.5-3.5s in post #1931), something in the drivetrain is catching up.

 

[shady]

I think it needs more preload.
Even if it has nothing to do with the shudder thing.
Couldn't figure out how to trim it so it's kinda long. And can't really tell any shudder in it even though it did it mildly.

 

[shady]

Also.... I hooked the fun button back up.