hey everybody, new to the forums and had some questions. I have a 71 chevy truck and i recently did a LS1 swap. The problem is my tranny shifts just fine driving normal but when you get on it, it doesnt wanna shift. im running 4.10 rear with 275-40-20 tires, i havent had the computer tuned yet but everything else is working fine, Thanks
Its the tuning...it wont shift with those gears untuned
Vortec Performance Tuned
LQ9 built 4L60 LTs and a billion miles on the speedo!
Well i took the computer to a guy last week and had him tune it to my gears and get rid of the stuff i dont need, didnt get to drive it until today and it is still doing the same thing, What else could it be, ive already smoked one tranny and i dont wanna do that again, but the other tranny was doing the same thing so i wouldnt think it would be the tranny. Thanks
Maybe you're going to the wrong guy.Originally Posted by rob344
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4
I took it out today and drove it a little, its not that the truck doesnt shift its actually getting to about 5500 rpm and then the tranny kinda throws itself into neutral kinda freespins but its only at wot
what's your rev limiter set to?
what's your max shift rpm set to?
what's your shift speed vs gear tables set to?
These are just a few questions that I ask when trying to troubleshoot issues like this. Shifting requires the speed (mph) requirement to be met first (along with fluid pressure and other things), then the PCM will allow a shift at the desired WOT shift RPM value. Otherwise, if you hit 5500 (if that's your max RPM), the vehicle will bounce limit until that speed requirement is met (in whatever gear you're in). Sounds like your tuner has a little bit of homework to do.
Good luck!
5.3L '86 Silverado (E/T: 14.37s @ 94mph) - First Time Out!Test-n-Tune (Nov 23, 2008) - 13.65s @ 98mph
rebuild time
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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