I sent a speedo head into a GM service center for repair/calibration. I've cleaned and lubed the speedo cable housing and cable itself twice, but I still having a bouncing needle of some 5 mph at 75, which on a 145 speedo seems a lot. Do I simply need to replace the speedo cable or could the speedo gears (drive, driven) and/or sleeve be the problem? I'm fishing for anwsers.

JamesC

 

Hey James. I had somewhat similar problems on my 87 SS (120mph speedo; speedo guts are similar but different)

I had all new GM speedo gears / sleeve & speedo cable. Well I have repaired speedometers before so I pulled the speedo and upon disassembly, I found the trip odometer cluster to be faulty and locking up. It would do a click thing every so often, or it would work fine, or it would do as you described. I installed a new trip odometer cluster as the rest of the speedo checked out fine and my speedo has worked great ever since.

-Matthew

 

The GM service center took care of the trip as well when I sent the speedo head in, so that shouldn't be the problem. The followin link is my fix to that particular GM screw-up. By the way, thanks for the sleeve and gear. I picked up a new OEM speedo cable today, but since the high here in Kansas was mid-twenties or so, I'll probably not attempt any repairs for a few months.

https://www.thirdgen.org/techbb2/sho...hreadid=249244

JamesC

 

Gotcha. Yeah mine don't have that j-clip (or related problem) the trip odo cluster was just randomly siezing up. Cable is a good possibility then.

 

By the way, when I replace the sleeve, will I get a flood or dribble?

JamesC

 

Little bit of column A, little bit of column B from what I was told when I was going to change mine. Ended up not doing it because the rearend I bought had the same crappy 2.73 rearend and not the 3.23 I was expecting.