[Geoff87]

A few weeks ago i noticed a problem with my speedometer. It would dance all over the place while I was driving, from zero to fifty, and back to zero, all while I am cruising at 45 MPH!?!? In addition, the car seems to want to upshift then downshift then upshift, causing the car to move in a jerky motion. Any Ideas? New speedo cable and trans solenoid? Thanks in advance.

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1987 Buick Grand National
40#, KB Adj. FPR, KB exhaust. KB ultimate chip, Walbro 340.

1985 Buick T-Type
Accufab Adj FPR, Walbro 340, Adj Wastgate, 9" K&N
Currently in pieces!

1985 Toyota 4x4 Ext-Cab
4" susp. lift w/33's Daily Driver.
Seeking a 22R turbo intake & exhaust.

 

[blkmagk]

The upshift/downshift is probably in the chip, where the OD lockup is. It's around 45 - 50 mph. That can be adjusted. The speedo going in and out sounds like time for a new cable or grease yours or maybe it's about to fall out of the housing! Takes a special fitting to do grease it. HTH.

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87 GN
Stock, basic mods, etc.