05' silverado rcsb 4x4 5.3 ,cai,tb spacer , pacesetter lt's w/ y pipe single flowmaster 40 w dual side exit , and a Speed Inc tune , ran 14.50's with poor reaction times , installed a Yank 3000 stall and it ran awesome never got it down the track before stock trans went out , installed a FLT Level 3 4l60e trans w/ retune and shift point adjustment , it would only go 15.20's at 88 mph , please help , what are we missing , tune and or shift points ??? It ran really strong out of the hole on the yank converter and stock trans

 

just a random question but how was the wheel spin on both of those runs?

 

no wheel spin

 

Your tb spacer is probably too short. J/K, it is probably the tune and/or shift points. Also, a performance tranny will eat up a bit more power. Did you get that thing tuned on a dyno? That will maximize your engine output. I was able to gain 40hp by seeing what was happening on the dyno as we tuned.

 

I'm thinking going back to the stock shift points

 

Post timeslips of both runs please.

 

What happened to the yank converter? Also you need to post the tune

 

the the yank is still in , heres the best run with current set up , the 14.5's was last fall . rt-.584 60'-2.252 , 330-6.325 , 1/8-9.789 , mph-71.13 , 1000'-122.774 , 1/4-15.294 @ 89.45 ,working on getting the tune to post . I'll be in Germany back on 4/30 hoping to get some solid suggestions so I can get this right when I get back

 

Did you stall it up at the line or go off idle.

 

What was the temp on both days? My truck will run low/mid 13s in the winter with 30* and the best I could manage last month in 75* was a 14.0. Weather plays a pretty big role in performance on a NA truck.
And reaction times don't go into the final time. Unless you bracket racing or something