elliott10
New member
So i bought a ls swapped 1991 suburban 2500 4x4. From the factory it has a 4l80 transmission. When i got it the 5.3 was already installed and running good but the torque converter won’t lock up. So i took it to a mechanic friend in Louisville ky who specializes in ls swaps. He did his magic and cleaned some stuff up.
Here’s the kicker, the speedo works about 40% of the time. When i take off it always works up to 15-20 mph, then it bounces around and if it stays working once i hit 30-35 it sticks and works like normal on up to whatever......but if it doesn’t stay working and drops to zero as i speed on up to whatever the torque converter wont lock up. I know its an electronic speedo but i dont know what causes it to bounce and flutter like that. My mechanic friend is a bit stumped by this (he doesn’t do many 4x4 swaps).
Any help will be much appreciated.
Jonathan
Here’s the kicker, the speedo works about 40% of the time. When i take off it always works up to 15-20 mph, then it bounces around and if it stays working once i hit 30-35 it sticks and works like normal on up to whatever......but if it doesn’t stay working and drops to zero as i speed on up to whatever the torque converter wont lock up. I know its an electronic speedo but i dont know what causes it to bounce and flutter like that. My mechanic friend is a bit stumped by this (he doesn’t do many 4x4 swaps).
Any help will be much appreciated.
Jonathan