Speedometer troubleshooting

Does anyone have a tried and true method for troubleshooting the speedometer?

It has completely stop working. Sometimes when I smack the dash while driving it will go a little but not much.

Is there anyway I can rule out the cable because that looks like it is going to make me cry if I have to replace that.

 

The gears in the odometer go bad. You can buy replacement nylon gears online.

 

Got a link on hand by chance?

 

I don't. Tried googling it but couldn't find someone who sells it. I know some Toyota truck part website sells it but I forget who.

 

Something like this but that isn't the correct one I believe

 

Done the cable twice on my 97, it's not that bad of a job. Getting the cluster out is probably the most time consuming.

P.s. if you do a new cable, make dam sure it doesn't touch the exhaust or you get to do it again in the near future.

 

How do you know it's the cable or the gears in the speedo unless it stops?
Mine has a howling sound that comes and goes from behind the dash.

 

I unhooked the cable from the transfer case end first and made sure it wasn't broken on that end. Everything looked fine down there so I pulled the cluster and the cable was broke off right at the gauge. There's really not much to the speedo, not really any gears in there. It works more off of friction I think. Either way if it's not broke at the tranny end, the clusters gotta come out to diagnose.