what the heck is going on

[muddog]

I got a six inch lift on a 93 bronco with 35's. when i get up to highway speeds the speedometer needle will jump up and down. would reprogramming the computer for the bigger tires take care of that?

 

[TX_BEAST]

I got a six inch lift on a 93 bronco with 35's. when i get up to highway speeds the speedometer needle will jump up and down. would reprogramming the computer for the bigger tires take care of that?

24718[/snapback]

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could be many things i would start by looking at the vehicle speed sensor and checking the exciter ring in the rear end if its electronic. if cable driven then check cable.

 

[Bronco89XLT]

Mine does that throughout the entire range from 0 to at least 75. Doesn't bother me much, just thought it was a quark with the Ford trucks because my 84 F-150 did the same thing.