Hopefully I’m putting this out in the right place. Finishing up my LS SWAP in my 61 impala convertible. The motor is a 2004 Silverado Z71 , with a 4l60e trans. It’s drive my cable, pcm has been flashed. Motor is basically stock. All other gears werk fine, but when I switch to reverse, it stalls. I have no idea what I’m missing here. Has anyone else experienced this? Thanks in advance

 

when cold AND fully warmed up?
when going from park to reverse AND when going from neutral to reverse?

 

yes sir, no matter which gear I’m in and switch to reverse it stalls.

 

Have you gotten it into reverse with it running? Does it move normally ? Or is the trans locked up in reverse?

 

it will go into reverse gear, but as soon as it does, it chugs and stalls.

 

You have a short somewhere.

 

could you be alittle more specific ? There’s a lot of electrical here lol