Speedo noise question

[PomPom]

Good morning all, 

had a couple quick questions and forgive me if it’s been answered. I’ve searched for the answers and found some that were similar but thought I’d ask and show you what was going on.

in the video you can see the speedo clicking and whining when the trip rolls over to a mile. The speedo is reading about 5 mph slower than actual. After it clicks it lands at the accurate speed for a few moments, before dropping back down. Just curious what is causing this sound and why the rollover is so aggressive, and maybe how to fix it haha. 
second question, this cluster is from a newer model jeep, not an 1986 right? 

 

 

thanks for any and all help. If there is a topic already created that answers this for me, please point me there. Hate to be repetitive. 
 

[Gojira94]

That's a 'High Line' cluster earlier than 87-88, so if your MJ is an 86, it's probably the original. The noise and behavior seems to indicate a hitch with the tenths mile position on the barrel inside the speedo. It could be as simple as cleaning and lubricating the barrel to relieve the sticky end at the tenths position. I will say it's NOT super simple and great care would need to be taken while working with it. You'll have to get into it to find out what's going on though.

 

Member @boxyjeep has significant experience with all the variants of clusters from 84-96, repairs, and also sells some electric speedo conversion kits and a good video of the differences and changes in clusters here: Jeep Cherokee XJ Gauge Cluster Repair Guide

 

Another video of how to extract and work with the barrel here: How to Calibrate Renix Gauge Cluster After Full Gauge Cluster Swap

[PomPom]

8 hours ago, Gojira94 said:

That's a 'High Line' cluster earlier than 87-88, so if your MJ is an 86, it's probably the original. The noise and behavior seems to indicate a hitch with the tenths mile position on the barrel inside the speedo. It could be as simple as cleaning and lubricating the barrel to relieve the sticky end at the tenths position. I will say it's NOT super simple and great care would need to be taken while working with it. You'll have to get into it to find out what's going on though.

 

Member @boxyjeep has significant experience with all the variants of clusters from 84-96, repairs, and also sells some electric speedo conversion kits and a good video of the differences and changes in clusters here: Jeep Cherokee XJ Gauge Cluster Repair Guide

 

Another video of how to extract and work with the barrel here: How to Calibrate Renix Gauge Cluster After Full Gauge Cluster Swap

Awesome thank you so much for your assistance. When I get a chance I’ll give it a go and post the results on my build page. 
thanks again cheers!