Transmission shifts out of O/D
Posted 25 February 2020 - 02:00 PM
Posted 25 February 2020 - 04:09 PM
Are we talking the transmission shifts out of 4th down to 3rd, or is it the torque converter is falling in and out of lock up?
Posted 25 February 2020 - 08:08 PM
Posted 25 February 2020 - 08:31 PM
The F-Body 4L60E changed lockup strategy from “switched” to “pulse width modulated” starting in 1995, so its behavior is not going to be comparable to a switched system.
I would recommend you download (free, thanks to GaryDoug) the 1999 factory service manual. The transmission section has a lot of troubleshooting and diagnostic charts.
1994 FIREBIRD FORMULA
381ci all-forged stroker (Callies Stealth, Oliver billet rods, BME 2618-T61 nitrous pistons) - 10.8:1 - CNC LT4 heads/intake - Comp Cams solid roller - MoTeC M48 Pro engine management - 8 LS1 coils - 58mm TB - 74#/HR injectors - 300-shot dry nitrous - TH400 - Gear Vendors 0.78:1 O/D - Strange 12-bolt - 4.11 Pro-Street gears - AS&M headers - true duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP / 800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117 MPH straight motor
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