I don't quite understand how the shift points can be off. the truck shifts based on RPM, correct?
I got the 4.56's installed and am going to send the PCM for the re-tune. I was wondering if I would notice any driveability/performance difference or if it is just practically a re-cal of the speedo
MKader17
Should have a good deal more pep, and accelerate much easier. Take it easy on them till they break in! It's gonna be tempting.....Originally Posted by MKader17
2002 Silverado 2500HD LB7 CCSB LT
EFI Live by Rob at ATP, Edge CTS Insight DSP 5 control, S&B CAI, PPE boost valve, Pro Fab AIH, AirDog II 165, PPE WIF sensor delete plug, 5" stainless exhaust, Cognito braces & HD tie rods, H2's 315/70 R17 BFG's
2004 Tahoe LT
2006 Silverado Z71 LS
1971 Chevy C10
No help?
MKader17
truck shift points are based off RPM and MPH but thats only at WOT...otherwise all part throttle shifting is based solely on MPH and at that also the toque converter lock up and unlocking is also based on MPH
2006 silverado SS....Clifford Jr...turbo coming soon
1970 Chevelle ly6 swap....d1 coming soon
When I changed from 3.42's to 4.10's and also went from 31" to 30" tires the speedo was WAY off and the ABS and E-BRAKE lights were on. With Wheatley tune,problem fixed!!
2007 GMT900 RCSB 5.3L,AEM cai,Wheatley 93 tune,Pacesetter longtubes,O/R Y-Pipe,Dynomax ultra-flo,G80,410's,Circle D 3C 34-3600 stall,vette servo,1/8 mile p.b.8.98@78.67 mph BEFORE stall. New pb to come soon... Stay tuned for more...
I went from 3.42 to 4.10 in my sierra, and all the shift points were really messed up! It was funny to see the speedo with the computer thinking I still had the 3.42 in play. I just used a hypercrap till I recieved my nelson tune. I am currantly on a different truck, so this time around I am going with 3.73 so I still have the second gear down shift at 60....
1999 GMC Sierra SLE sc sb 4.8l 4L60E, Comp 1.75 roller rockers, graniaelli maf, garneaelli wires, Aem brute force intake, BBK 80mm tb, Nelson tune, 2/4 drop, Denali rims, custom grill, Denalli guages, Edelbrock IAS shocks, Tahoe E-fans, Nelson harness, and tune, McGaughy's 2" drop spindles, New matched coil springs, Air Lift rear lowerd air bag kit, Air Lift wireless remote
List of things to do
4.10 gears and a new posi, Lt headers, Cam, Heads, Intake,
When I changed the gear ratio my abs lights come on and off all the time. Some time it will be off and others on. Code is for mismatch wheel speed signals. nelson program only corrected my speedo. These trucks have a three sensor syste, and the rear sensor at the trans output reads faster than the front. The pcm/ebcm will read differnet signal. front will be low and the rear will be high. I been playing with resistors in the signal circuit to lower the voltage output the match the front. And dont run auto 4wd on the street untill you get it programed, you could burn your clutches in the transfer case.
Last edited by Jermoslin; 04-09-2009 at 09:51 PM. Reason: wrong info posted
5.3, E-fans, LPP longtubes w/offroad Y, Dual Magnaflow, K&N Cold Air, 160 thermo, Voodoo 212/218 .531/.531 113 cam, Nelson Tune, 4:11, Built 4L65E, TrailBlazer converter. SOLD
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2006 2500HD 6.0L Crew Cab 2WD
Dale tuned my truck, before and after gear change. After the gear swap I had the ABS and E-Brake blinding me, had Dale update for the 4.88's and bingo, no more lights. Haven't had any issues with the ABS light coming on.
2002 Silverado 2500HD LB7 CCSB LT
EFI Live by Rob at ATP, Edge CTS Insight DSP 5 control, S&B CAI, PPE boost valve, Pro Fab AIH, AirDog II 165, PPE WIF sensor delete plug, 5" stainless exhaust, Cognito braces & HD tie rods, H2's 315/70 R17 BFG's
2004 Tahoe LT
2006 Silverado Z71 LS
1971 Chevy C10
I question the 3 to 4 channel change in 03. The GMT900 trucks and utilities have 4 channels but all the 800's are three.....rear wheel speed is off the OSS and fronts are alone.
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