Shift firmness decrease?
I have had my vette servos for about a week and this morning I noticed it was not shifting like it had previously. Also I had some of my buddies in Auto. Mech. ride with me who did when I first installed them to make sure I just wasn't getting used to it and they also noticed it wasn't like it first was. Does anybody know what would cause this? All coment appreciated!!
2006 extended cab, 6.0 swap, full bolt ons SOLD
2011 ECSB, 6.2, 6 spd, 3.73, 5" lift, 33" nitto, limo tint, debadged, volant CAI, muffler delete, black bear tune 14.0 @ 98 on the 33'sSOLD
2007 TBSS AWD, cam, stall, built trans, N2OSOLD
2006 RCSB cammed LQ9, full exhaust, 3200 stall, 2-4 drop
Originally Posted by farmtruc
49 Ford F1
355 chevy / turbo 350 / 12 bolt posi / camaro subframed
The ECU will adapt to the changes youve made in your transmission. Have you installed your Nelson tune yet?
03 Silverado ECSB - SOLD
06 CCSB Duramax - 12 second tow pig
Yes, Nelson tune has been in for over two months. Servos, 1 week.
2006 extended cab, 6.0 swap, full bolt ons SOLD
2011 ECSB, 6.2, 6 spd, 3.73, 5" lift, 33" nitto, limo tint, debadged, volant CAI, muffler delete, black bear tune 14.0 @ 98 on the 33'sSOLD
2007 TBSS AWD, cam, stall, built trans, N2OSOLD
2006 RCSB cammed LQ9, full exhaust, 3200 stall, 2-4 drop
49 Ford F1
355 chevy / turbo 350 / 12 bolt posi / camaro subframed
Its simply a function of the ECU adapting to the servos. Dont let it fool you, there still performing like they should be, its just smoothed itself out.
03 Silverado ECSB - SOLD
06 CCSB Duramax - 12 second tow pig
Will a retune get my shiftfirmness back and keep it there?
2006 extended cab, 6.0 swap, full bolt ons SOLD
2011 ECSB, 6.2, 6 spd, 3.73, 5" lift, 33" nitto, limo tint, debadged, volant CAI, muffler delete, black bear tune 14.0 @ 98 on the 33'sSOLD
2007 TBSS AWD, cam, stall, built trans, N2OSOLD
2006 RCSB cammed LQ9, full exhaust, 3200 stall, 2-4 drop
49 Ford F1
355 chevy / turbo 350 / 12 bolt posi / camaro subframed
Eh, I would leave it alone. Do not increase tranny shift pressures. Just remove torque management.
2000 ECSB 6.0L
TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's
So now with the servos will the tranny beable to hold up to no TM, and how much does Nelson leave in there for a stock truck?
2006 extended cab, 6.0 swap, full bolt ons SOLD
2011 ECSB, 6.2, 6 spd, 3.73, 5" lift, 33" nitto, limo tint, debadged, volant CAI, muffler delete, black bear tune 14.0 @ 98 on the 33'sSOLD
2007 TBSS AWD, cam, stall, built trans, N2OSOLD
2006 RCSB cammed LQ9, full exhaust, 3200 stall, 2-4 drop
49 Ford F1
355 chevy / turbo 350 / 12 bolt posi / camaro subframed
Mine have both done the same. It's called TAP (Transmission Adaptive Pressure). You can constantly reset the TAPs with a scanner or have the pressures modified in the tune...or removed most/all TM. You the only way to keep them firm is to up the pressures. Even removing TM won't keep the PCM from pulling pressure to get the shift times ''correct'' via TAP.
remove the pcm controlled transmission pressure control solenoid on the transmission and replace it with a Transgo vacuum pressure control module and your shifts will be consistant.You vary the shift firmness by lengthening or shortening the little push rod inside the Transgo kit.
Only bad thing is that you have to drop the trans pan to make mods.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
If all else fails I had the same issue after I rebuilt and installed a shiftkit in my 4l60e I shifted nice and firm all gears but especially 1-2 upshift, then one day that shift got really soft, softer than the others, I removed the transpan and the 1-2 accumulator piston housing, the one held to the trans inner case by three bolts, and found that the plastic piston cracked and was letting pressure leak through it, I replaced it and refilled the trans and drove it, and it took care of my problem, so this might be something to think about...
Had a 99 GMC ESCB with LQ4 conversion and Nelson Performance tunning, currently workin on my 82 SCB GMC with carbed LQ4 conversion in progress, Also have a 00 SS Camaro that runs mid 11's all day long with bolt ons, Drag race my 79 malibu that has a 496 BBC runnin 10's on motor, shootin for 9's with the 250 shot of nitrous in its near future. Use my 04 2500 chevy to pull my rig around and drive the fam in our 07 NNBS yukon, Die Hard Chevy Fan Till The Death.
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