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Hi all, this is my first experience with a built trans and a high stall converter. Previous toys have all had T-56s. It's a 2008 Silverado NNBS RCSB, KB racing turbo kit (borg sxe369) with 4l80e swap, true-trac and 4.11s. We re-pinned the harness and applied van tcm to tune it. Trans was built by a local, reputable race team trans builder for the purpose of street driving for me. All new clutches, bands, harness, servos, and more I don't know, and a 3200 stall single disk billet FTI? converter. Runs/drives great, shifts awesome, boils rubber on demand. Two weeks after the 4l80e install I broke the input shaft on a 2-3 shift on the highway. It went back, got ATI hard parts so that doesn't happen again. Here's my issue - and I didn't notice this behavior before I broke the input shaft - when I accelerate in normal traffic from a dead stop, in first gear, when the fluid is cold it drives as I would expect. At operating temp, like above 100 degrees trans fluid, it feels like a slipping clutch from a dead stop to like 30mph. And attached are two screen shots demonstrating the issue. In one you can see I'm at 3810 rpm and its going 27mph. This was "cold" and feels "normal" to me. The other its at 3809rpm and only 15mph, and you can see reported TCC slip of 2082rpm. These are from the same drive, about 15 minutes apart. Same situation accelerating with traffic from a traffic light dead stop. Should converter slip below stall speed vary with temperature or just randomly? Or should it be consistent? Also, when it does this, sometime I'll give it more gas pedal to get going, and it will throw the ABS light. Not sure how to get the codes for that in hptuners, nothing is listed in diagnostic codes for ABS. The ABS will clear after shutdown and normal driving again. Thanks if you can provide any guidance.
Edit: okay maybe the cold picture here isn't the best since it was making a little boost, but the issue of moderate acceleration having a ton of slip is happening, you can see 3809rpm and 2082 of slip, and it's a rated 3200 stall.
Hi all, this is my first experience with a built trans and a high stall converter. Previous toys have all had T-56s. It's a 2008 Silverado NNBS RCSB, KB racing turbo kit (borg sxe369) with 4l80e swap, true-trac and 4.11s. We re-pinned the harness and applied van tcm to tune it. Trans was built by a local, reputable race team trans builder for the purpose of street driving for me. All new clutches, bands, harness, servos, and more I don't know, and a 3200 stall single disk billet FTI? converter. Runs/drives great, shifts awesome, boils rubber on demand. Two weeks after the 4l80e install I broke the input shaft on a 2-3 shift on the highway. It went back, got ATI hard parts so that doesn't happen again. Here's my issue - and I didn't notice this behavior before I broke the input shaft - when I accelerate in normal traffic from a dead stop, in first gear, when the fluid is cold it drives as I would expect. At operating temp, like above 100 degrees trans fluid, it feels like a slipping clutch from a dead stop to like 30mph. And attached are two screen shots demonstrating the issue. In one you can see I'm at 3810 rpm and its going 27mph. This was "cold" and feels "normal" to me. The other its at 3809rpm and only 15mph, and you can see reported TCC slip of 2082rpm. These are from the same drive, about 15 minutes apart. Same situation accelerating with traffic from a traffic light dead stop. Should converter slip below stall speed vary with temperature or just randomly? Or should it be consistent? Also, when it does this, sometime I'll give it more gas pedal to get going, and it will throw the ABS light. Not sure how to get the codes for that in hptuners, nothing is listed in diagnostic codes for ABS. The ABS will clear after shutdown and normal driving again. Thanks if you can provide any guidance.
Edit: okay maybe the cold picture here isn't the best since it was making a little boost, but the issue of moderate acceleration having a ton of slip is happening, you can see 3809rpm and 2082 of slip, and it's a rated 3200 stall.
Was this transmission rebuilt or just had an Input shaft put it. Some thing is changing with temperature regarding converter charge oil would be my bet. The converter cannot change stall without a change of oil supply or pressure.
Greg
__________________ FTI COMPETITION CONVERTERS AND TRANSMISSIONS "IT'S NOT CHEATING, IT'S THE COMPETITIVE EDGE." 1-866-726-8358 info@ftiperformance.com FTIPerformance.com FTI Converter build sheet
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3200 stall converter - normal behavior? 
