Posted by Ddd [199.27.128.184] on Friday, November 11, 2016 at 07:04:44 :
In Reply to: You Learn Somethin' Every Day posted by Randy On Long Island [108.162.219.114] on Thursday, November 10, 2016 at 19:35:36 :
I have a m37 speedo head in my wc12 at the moment. It's until I get another to replace it so I "borrowed" it from my m37. It's a known good working speedo.
Well it seemed to work fine the first drive around town, achieving 45-48 Mohamed keeping steady. From acceleration on they worked fine.
Yesterday coming back from a Veterans Day school program I noticed the needle jumping back and forth. At a steady 45 mph (est) the needle dropped to 25, bounced back to 45, and did this a couple of times, sometimes stopping at around 35, then back. Lower speeds from start seemed fine.
Now I got a brand new speedo cable installed too.
My question is what's happening? It's not outright failure. It's occational. Could it be the speedo unit in the transmission being the cause here?
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