145 speedo w/ odo
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Junior Member
Joined: Mar 2018
Posts: 80
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From: NY
Car: 1987 Firebird
Engine: 2.8L V6
Transmission: 700r4
145 speedo w/ odo
hey guys I just bought a new 145 speedo with 150,000 miles on it. And I’m trying to figure out how to set it back to my cars current mileage of 95,000. Ik it’s a touchy subject but it is legal as long as you aren’t committing fraud which is not. Help with this problem would be greatly appreciated!
Supreme Member
Joined: Jan 2009
Posts: 2,313
Likes: 115
From: belle fourche,s.d.
Car: '82 z28
Engine: L83 5.7
Transmission: 700r4-1985
Axle/Gears: 3.42 posi
Re: 145 speedo w/ odo
I think you will have to take the odo apart and reposition the odo rolls-cable driven GM speedos since 1969 have a ratchet mechanism to prevent odo from rolling back when speedo turned in reverse.Don't know about the Nippondenso speedos (most '86 up firebirds)or the stepper motor driven odos.Be very careful if you take the speedo mechanism apart-very east to ruin it...
Joined: Mar 2009
Posts: 2,036
Likes: 28
From: Florida
Car: 1989 Camaro RS
Engine: LH6
Transmission: T56
Axle/Gears: 3.42 Auburn Posi
Re: 145 speedo w/ odo
I did this a few years ago with my car. I took my factory 115 speedo and removed the 115 face, and put the 145 face on. Have to be careful removing the needle, but you can do it.
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