Gears

[Egg]

If I changed the gears in my 89 c1500 from 2.73 to 3.42 how would the speedometer act?My truck is 305/400thm and I think changing the ratio would be a big help in getting more performance.

[Stratosman]

The performance will be night and day. I am not sure about he speedometer, but there are hundreds of guys on here who I am sure will answer that soon.

[kirk]

Your speedometer will read fast when you put lower gears in. You'll just need to get it recalibrated. Putting 2.73's in anything definitely wasn't one of GM's better ideas.

[dalejrfan88]

Yeah im sure its pretty far off. I would definitely have your speedo recalibrated. Depending on your driving location, more city or highway, you might see better MPG.