Speedo Rattling & Jumping

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Duster666

Duster666

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I completed a rebuild of my A-833 transmssion (3 spd w OD) on my 1976 Duster. It was a complete tear down replacing syncro's bearings and seals. Tranny was in good shape, but was leaking from the seals. On my first test drive, when I get up to 20 - 30 miles per hour, I get a rattling noise from the Tranny area and the speedo jumps up to 50 - 60 miles per hour intermittently. I just drained the fluid, and pulled the speedo gear out of the side of Tranny and everything looks fine, no sign of damage etc. BTW it shifts fine and otherwise is smooth, and while I was at it, I changed the speedo cable to a brand new one from Brewers.

Before I put it back together does anyone have any idea what else to check as the source of the noise, and the direct correlation to the speedo jumping?

Thanks
 
Spedo cable, try to lube it sounds like it is binding and then letting go. I have the same problem right now.
 
Lube the speedo cable and also the speedo where it goes into...
 
Use dry graphite powder to lubricate it. Oil or any kind of greasy substance will attract dirt and grime.
 
While you have the speedometer cable disconnected check the end of the cable for the speedometer head cable. I bought a new Pioneer cable and still had issues. The head end of the cable was crooked just a little where they crimp the ball on. Straightened it up and the bounce is gone.
 
If the cable is routed differently that it was it can amplify problems like that.
Just a FYI :)
 
Bad Sport said:
Use dry graphite powder to lubricate it. Oil or any kind of greasy substance will attract dirt and grime.
Click to expand...

X2 Any sort of oil will collect in the lowest point on the cable sheath. When it does, it eventually stiffens and makes it more difficult for the flex cable to turn smoothly.
 
Also check to see if you have the speedometer gear indexed correctly, there is a notch on the case and the housing.
This needs rotated correctly depending on the amount of teeth on the gear.
 
Bad Sport said:
Use dry graphite powder to lubricate it. Oil or any kind of greasy substance will attract dirt and grime.
Click to expand...

Thanks everyone, the graphite lube seems to done the trick. Either that, or disconnecting and reconnecting the speedo cable and ensuring alignment of the cable ends.

Whew..., after rebuilding the Tranny its nice to find out it was just a simple fix like this, and not in the Tranny.
 
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