ls swap, 4l80e acting funny

[Lookin4the1]

Current setup:
6.0 LS with a bigger cam and springs.
4l80e with circle d 3200 stall converter

I didn't go through the transmission when I got it. I was told it ran well and shifted fine. During my first few test drives it just seems like the trans wants to shift to 4th and overdrive wayyyyy too quickly. I bought the computer separately and will have to get it tuned. It was in another swap before mine. I'm just starting to freak out about getting this transmission rebuilt.

my question is:

while tuning ( I know nothing about tuning) can the tuner adjust the trans control to pick different shift points? I'm assuming tire height and rear end gearing has a lot to do with it.

Or

Is this a serious problem that I should go ahead and fix before throwing more time and money on different parts of the project. I'm 95% complete

[BR3W CITY]

Originally Posted by Lookin4the1

while tuning ( I know nothing about tuning) can the tuner adjust the trans control to pick different shift points? I'm assuming tire height and rear end gearing has a lot to do with it.

yes

[Lookin4the1]

Originally Posted by BR3W CITY

yes

So as long as each gear if functioning I shouldn't have issue as of yet? 8' sorry I know this question is silly, I've just gotten a good bit of money sltiednup on this engine/trans setup
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[davepl]

You have the TPS working correctly? The trans needs to know the throttle position (load). Otherwise it's going to think your throttle has always returned to idle and it'll upshift early.

I'd expect the "default tune" to be close, but all bets are off until you've set up the computer, really....

[Lookin4the1]

TPS is a new sensor and im using a PSI harness.

[Hart_Rod]

MORE than likely the wrong gear and tire size is in the tune which is throwing everything in your transmission tables off.

[Lookin4the1]

Originally Posted by Hart_Rod

MORE than likely the wrong gear and tire size is in the tune which is throwing everything in your transmission tables off.

That's what I needed to hear. Thank you
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