So I have a 2 door tahoe with an lq4, 4l80e tranny , 3 inch exhaust, 410s nd tune the problem is I cant get it to spin from a dead stop I already cheked with my tuner and torque management is removed nd he added more timing but the truck still wont spin and feels kinda laggy from out of the hole I went from 342s to 410s and my 60ft only changed by .007 is tht normal????

 

Kinda hard to say without knowing more about the Tahoe. Stock engine? What converter and tires are on it. does it feel strong once the rpm's come up a little? The gear swap only netting .007 is a little odd.

 

Yea engine is off a 01 stock 317 heads stock converter nd yea on top end it has more power from a 30 roll ive kept up with my cousins g8 wich hits 13.5 I hit 14.8 with 342s nd 14.512 with 410s but my 60ft changed by .007 which I think is very little

 

O yea nd im running 20s with 275 40 20 tires

 

The stock converter isn't helping but with that gearing change you should have seen a better 60ft. Without seeing the tune its hard to say, there are many things you can play with in the tune to help it come out of the hole harder.

 

Yea I knosw my converter is tiht but my 60 is what makes me believe smthing might be wrong

 

I would say what you are seeing is normal 4L80E operation. While not as drastic, I went from 3.42s to 3.73s when my 10-bolt died and I put the 9.5" 14 bolt in its place in my Express. My old 5.7 makes more torque down low than your 6.0 does and I still did not notice much off the line change. With the tall first gear ratio of the 4L80E the mild gear change you performed does not change the overall 1st gear ratio all that much. First gear in a 4.10 geared 4L80E is roughly equivalent to a 3.23 geared 4L60E. I have a stock 4.3 2,200 rpm high stall converter in my Express and despite putting down 300 RWTQ @ 2,000 rpm just hammering the throttle from a stop, I can only sometimes break the tires (255/45R20s) loose until 10-15 mph. That being said when I had the 4L60E with its lower first gear and the looser 2,600 rpm converter I could spin the tires with relative ease at about 1/2 throttle.

 

4L80 and converter are your problem. A it's a power hungry tranny, the stock converter is really tight and it doesn't have as low of a 1st gear as a 4L60 but the trade off is you wont blow it up. Gotta get power up and a looser converter and you'll offset it's power robbing side effect.

 

The 80e only takes like 10hp more than the 60e. The difference is from the gearing in the trans. Did the tuner disable abuse mode? TM is only active on shifts.

 

The stock converter is a bit tight for a LS engine although a GM B82 foot stalls about 2,300 rpm behind my cammed L31. I suspect it would only stall 2,100-2,200 behind a stock 6.0.

The 4L80E only takes about 10 HP more to run than the 4L60E, but has a bit more internal mass in addition to the taller gearing. The factory torque converter is also a good bit heavier compared to a factory 4L60E converter. That additional rotating mass does not really show up as a power loss on the dyno, but shows up real world when you try to accelerate from a stop. I had to add a substantial amount of acceleration enrichment fuel and slightly retard the timing during the transition from idle to stall speed due to the additional weight of the 4L80E converter.

I would remove abuse mode, but leave about 50% torque management in the shifts. With the quicker shift times and slightly higher line pressure map I run, any more than 50% reduction causes my Express to lay rubber during the 1-2 shift at anything over 1/2 throttle. To say it is a harsh upshift would be an understatement.