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LS short box · 04-13-2023, 10:02 PM

My .02 is buy a LS harness/ECM from a vendor that has a proven track record of suppling a great harness and tech support. I've done dozen LS swaps for me and friends. I use Speartech and Howell. Tech support is only a call away in the states. Don't know about PSI.
In regards to the 8 speed they get zero love over on LS1tech.com.
I had a 2015 Silverado with the 6.2/8 speed combo. Always shifted hard when cold 1/2 and 2/3 shift. Even after back to the dealer for reprogramming. Also hard down shifts as I slowed down for a stop light. Never left me anywhere but I traded it before the warranty ran out.
Currently I drive a 2020 Silverado 6.2/10 speed. The 10 speed is sweet. The truck has settings for standard, sport and towing. Works well.

04-13-2023, 10:02 PM	#2
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,958	Re: Ebay Gen 5 LS Wiring Harnesses? My .02 is buy a LS harness/ECM from a vendor that has a proven track record of suppling a great harness and tech support. I've done dozen LS swaps for me and friends. I use Speartech and Howell. Tech support is only a call away in the states. Don't know about PSI. In regards to the 8 speed they get zero love over on LS1tech.com. I had a 2015 Silverado with the 6.2/8 speed combo. Always shifted hard when cold 1/2 and 2/3 shift. Even after back to the dealer for reprogramming. Also hard down shifts as I slowed down for a stop light. Never left me anywhere but I traded it before the warranty ran out. Currently I drive a 2020 Silverado 6.2/10 speed. The 10 speed is sweet. The truck has settings for standard, sport and towing. Works well.