I got back the rebuilt 4l60e yesterday with a 4843TWBX GoPNH (precision of New Hampshire) refurbished torque converter, which was original equipment with the 5.7litre 2004 GTO. GTO weighs 500lb more than my 1984 Monte (3700lb vs. 3200lb) and has 50 more horses (350 vs. 300). The powerband of the LM7 shows like 340ft-lb torque at 2500RPM. I'm having a hard time determining what will be the approximate stall speed with stock 300hp LM7. The engine/trans came from 2003-2004 RWD Silverado. Do I have a good torque converter? My friend told me it is probably 1700 RPM stall speed - I contacted the manufacturer and asked. I see people on gbody forum using 1900-2500 stall speed torque converter. Trans not installed yet, so I can change the converter if convinced.
I'm going to put a 3.73 posi in the 7.5" rear - found a kit with rave reviews here: https://www.quickperformance.com/GM-75-7625-10-Bolt-Posi-Gears-Bearing-Kit_p_20409.html
I'm going to put a 3.73 posi in the 7.5" rear - found a kit with rave reviews here: https://www.quickperformance.com/GM-75-7625-10-Bolt-Posi-Gears-Bearing-Kit_p_20409.html