I have a 85 gt 4speed 2.8 I have 17in weels with ulta gt tire's. When I jump on the freeway my car want's to run. Iv read that it should only be cruzing at 60-65 but mine what's to drive at 70-75 with no effert. Can someone tell me the RPO code's for the deffrent final drive's. Like what's the code for a 4.10,an what's it for a 3.65, an so on. Thank's

Not sure on the RPO codes but they will not help if it is an 85 V6 car as all the V6 4 speeds had the 365 gears unless some one changed the tranny or the internals over to the 332 gears which some people did. Dan

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DARN Cars now open with
Over 30 years wiring experience between cars and trade as an avionics technician in both Canadian Air Force and civilian aviation.
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Ok, thank's.