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LSX454 swapped 95 BASS burb.

Little lower, little cooler, bigger sounds.
Overview Gallery Discussion
Is the idler pulley between the alternators true with the alternators? The picture makes it look crooked and in the videos, it seems like something is going on there. You could always swap that pulley for the next smaller size and that would make the belt effectively longer.
 
The outside alt does have a very slight kick to it.
I can't seem to get it straighter, but it's minimal.
It does seem that I need to space the idler out some so the belt rides more in the center :thinking:
Never noticed how close to the edge it is.
 
Sometimes I chuck my belt if I rev it out to 7,000 for a bit, but it’s a junkyard tensioner and idler. It made noise 2 years ago but never replaced it cause it stopped? I probably should. :haha:
 
That sound when the shaking starts sounds like tires, but kinda sounds like it's coming from the transmission area.
Plus, if it was tires why does it do it at low power but not when I get on it...?
I can't imagine it's spinning the tires that low :dunno:
 
shady said:
That sound when the shaking starts sounds like tires, but kinda sounds like it's coming from the transmission area.
Plus, if it was tires why does it do it at low power but not when I get on it...?
I can't imagine it's spinning the tires that low :dunno:
Click to expand...
This sounds like something inside the transmission is craping out
 
shady said:
So, the caltracs, although needed for wrap, don't seem to have changed the stutter deal.
Maybe even amplified it. :doah: :notworthy:
This is accelerating moderately right after the 1-2 shift.
That is NOT the road.

View attachment 507951

View attachment 507952
Click to expand...
In the 2nd video, did it stutter when you weren't even on the throttle at all?

It seems like it is getting worse. You have a log of that?
 
No I wasn't logging, didn't expect it to do it.
It only does it trying to accelerate. You can here the throttle and what I was doing with it. It was mild acceleration, then I did it a little harder. Then when I gun it a little, it didn't do it :dunno: .

I keep wondering if I have rear end issues. If something in the gov loc could be messing with me, or :dunno:
Mainly because of this tir mark.

IMG_20250630_154445538~3.jpg
 
The last stutter of the last video, at the 7 second mark, it sounds like it does it with no throttle....

That picture looks like wheel hop, are you sure your shocks aren't loose or shot?

If there is something else wrong in the drivetrain it could also cause that.
 
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That was just light pedal to maintain speed.
So shouldn't be spinning by no means.
 
shady said:
That was just light pedal to maintain speed.
So shouldn't be spinning by no means.
Click to expand...
Let's get @Greg Ducato in on this.
It sounds and feels like the torque converter shudder I was having.
It only happened on part throttle or just off throttle but when you punched it, it held strong.
Mine was mild enough that the additive made it better, but yours sounds like it got worse
 
I've thought that for quite a while but been hesitant to believe it because it was a $1300 custom built converter. And it's suck to get out lol
 
The converter is not supposed to be locked until 4th gear in your tune, and it can't lock itself.

So if the trans is trying to lock the converter without the computer telling it to, something is way wrong.

Before we did a test where you tried it in manual low, which hydraulically shouldn't be able to lock the converter even with a faulty solenoid, and it still did it.

Now, if there is some strange internal trans leak that is causing this it could be causing other problems too.
 
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I think it can happen without being locked.Screenshot_20250708-132452.pngScreenshot_20250708-132515.png
 
I am not going to waste my time debating AI.

Especially when you ask it a broad question and it contradicts itself.

I'll just say this, if you look in the ATSG manual for a 4L80E, the hydraulic circuit for the TCC is not supposed to be pressurized in 1st gear. So if the solenoid sticks on when it drops to 1st gear it won't stall the engine. The converter requires pressure from the trans pump to apply the TCC.

It's possible it could be a faulty stator or something, but I think that would be pretty rare, especially with a custom billet converter, and show up in the data log. Last data log I looked at, the trans was slipping, the converter looked normal.

Try to get a data log of that shudder, and we should be able to tell...
 
folkenheath said:
I am not going to waste my time debating AI.

Especially when you ask it a broad question and it contradicts itself.

I'll just say this, if you look in the ATSG manual for a 4L80E, the hydraulic circuit for the TCC is not supposed to be pressurized in 1st gear. So if the solenoid sticks on when it drops to 1st gear it won't stall the engine. The converter requires pressure from the trans pump to apply the TCC.

It's possible it could be a faulty stator or something, but I think that would be pretty rare, especially with a custom billet converter, and show up in the data log. Last data log I looked at, the trans was slipping, the converter looked normal.

Try to get a data log of that shudder, and we should be able to tell...
Click to expand...
I don't think it's the lockup that is shuddering but the clutch in the TC.
Mine wasn't happening in lockup but in low rpm.
It happened in 2nd 3rd and 4th.
 
I just looked it up because when my Taurus was shuddering it was in like first and second.
Always on take off.
I've never personally seen it up where lockup would be :dunno:
 
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