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4L60E Won't Downshift

1999 K1500 5.7L V8 w/4L60E Won't Downshift to 1st First shop replaced all solenoids and it did not fix anything. ($1000) 2nd Shop ran a new wire for the downshift solenoid and it didn't fix. They then ordered a new ECM. It changed nothing. I'm back to fixing it myself and was hoping...
- CHEVY_1999_K1500
- Thread
- Mar 26, 2023
- Replies: 17
- Forum: Transmissions
Knock Sensor Wiring

I started getting a knock sensor OB2 Code and went to look. Sensor is there but the wire is torn up. Bought a new Sensor and connector (w/pigtail) but don't see where the old wire tore off. Can somebody let me know how the wire is routed so I can try to take apart one of the looms nearby to...
- CHEVY_1999_K1500
- Thread
- Feb 7, 2022
- Replies: 1
- Forum: Engine Performance + Maintenance
GM 1999 K1500 Suburban Speed Control Actuator

My Speed Control Motor (Actuator) stopped working and it looks like it is a discontinued item from GM. Does anybody have a source for these ?
- CHEVY_1999_K1500
- Thread
- Aug 6, 2021
- Replies: 3
- Forum: Audio + Electronics
GMT400 Common Fasteners

Hoping somebody has a list of common hardware used on doors and body: Screws holding down door panels at arm rests (includin speed nuts to seure) Screws holding door trim plates at bottom of doors. Including Barn Doors at back of Suburban. Screws that hold secure rear brake light/backup...
- CHEVY_1999_K1500
- Thread
- Jul 11, 2021
- Replies: 5
- Forum: Paint / Body / Detailing
1999 K1500 Suburban HVAC Blower Speed Connector

Does anybody have a part number for the wiring harness connector which plugs into the Fan Speed Selector Switch on the back of the HVAC Control Unit. Mine has a couple of fried wires and the connector is cracking and failing. I was able to get the old one apart and re-solder the broken pins...
- CHEVY_1999_K1500
- Thread
- Jul 10, 2021
- Replies: 8
- Forum: Audio + Electronics