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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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I drive a 1988 Ford Bronco XLT. It's weird because the motor

Customer Question

I drive a 1988 Ford Bronco XLT. It's weird because the motor in it came from a 1988 Ford Mustang GT. My problem is I get high rpm's while driving highway speeds. Roughly 4000 at 55mph. Is there some kind of disturbed power to weight ratio due to the motor that's in it? Or is there something simpler that I'm just missing?
Submitted: 1 year ago.
Category: Ford
Expert:  HDGENE replied 1 year ago.

hello, what engine was in it and is it the same size now? You used the pcm from the donor vehicle that matches the engine? Seem like the trans isnt shifting right?