I just got a 2004 gmc with the 5.3 Its a ecsb, and has 17in dinali wheels. Its got a 4in cai, flowmaster muffler, 3.73, and a street tune with all torque management taken out. it only ran a 10.45 at 69 mph in the 1/8! I was pretty disapointed....



my 02 chevy ecsb with 3.42 gears, stock rims and tires, 4in cai, and nothing else ran 10.20's and 30's at 70-71 mph

my 04 has my mods listed above in my previous post and runs slower. I just dont get it. I also have a corvette servo in the trans as well....

I wonder if the tune is off or something. I have heard of people just having the torque management taken out and picking up 3 tenths in the 1/8th

 

what was your 60ft. time? in my experience this makes all the difference....i asume you were hooking up pretty good with and ec and i would think the 3.73 would do good.......buy i dunno..........i have an 02 rcsb with a 5.3 and 3.42 with a CAI and 3" exhaust and it ran a 10 flat 1/8th so that might be about right bc of the weight difference.........

 

Every truck is different and I'm sure there were other differences between the two runs (i.e. weather). The tune could definitely be a little off too...

 

Who did your tuning?Alot more needs to be done in the tune than TQ managment of course