What does it mean when the speedo needle jumps around when you are moving at a constant speed?

 

Kinked speedometer cable. Possibly just needs lube, but more likely has a kink in it somewhere.

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82 Berlinetta, orig V-6 car. Rescued w/86 LG4/TH700R with all harnesses, sensors, ECM, etc. 2.73 open. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, ported heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. Currently 396 .030 over, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

 

How do i lube the cable? Just get some wd or triflow or something?

 

Use powdered graphite.
Can be found at any parts store.


Ron C. Terry

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'82 Trans Am
'81 Camaro Z-28
'94 Vette LT1 Coupe

 

I've got the same problem- I heard it could also be a chipped tooth in the speedometer cable gear in the transmission, but I haven't had a chance to check that out yet...


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Original owner - '84 T/A w/stock 305HO 5-speed