Speedo

[Brandon_l1000]

So, I just picked up a 1990 suburban for 500 bucks. The speedometer doesn't work, does that work off of a speed sensor? If so are there any tips to changing it? I believe it's a 4l60e but I could be wrong. All of my other trucks are manual, so I dont have any experience with older automatic transmissions.

 

[gmbellew]

it should be a 700r4/4L60, not a 4L60E. but the speedo is electric. there is a VSS coming out of the transmission and a DRAC module under the dash that makes the signal match the speed for your gearing and tire size.

i can't help any more than that, sorry. it could be that something is unplugged or is not getting power.