Maxin' out!!!!
Thread Starter
Senior Member
Joined: Jan 2008
Posts: 564
Likes: 11
From: Albuquerque NM
Car: 1985 Camaro Z28
Engine: 5.7 LSX
Transmission: Performabuilt 4L60E
Axle/Gears: Strange 12-bolt 3.73
Maxin' out!!!!
Ok heres a pic of me topping out my speedometer.
Nice! Right? I'm probably doing about 120 or so, but who knows. Which brings along 2 questions...
1st- Why did Chevrolet put an 85 mph speedometer on the 85 Z28 and then up it to a 140 mph speedometer in the 86 Z28??? There were no upgrades as far as I know. So why? It doesnt make sense!
2nd- How hard would it be to swap speedometers? Is it a simple swap or do I need to have it calibrated???
Nice! Right? I'm probably doing about 120 or so, but who knows. Which brings along 2 questions...
1st- Why did Chevrolet put an 85 mph speedometer on the 85 Z28 and then up it to a 140 mph speedometer in the 86 Z28??? There were no upgrades as far as I know. So why? It doesnt make sense!
2nd- How hard would it be to swap speedometers? Is it a simple swap or do I need to have it calibrated???
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Speed Limit - Depends On The Restrictor Plate
Insufficient speedometers were mandated in 1979 by NHTSA.
It was an attempt to make you drive in slow motion.
Also you’ll notice the very slow speed of 55 is in a different color on your speedometer in an attempt to remind drivers if you reach 56 MPH the World will explode.
The above nonsense was repealed in 1981.
However there is lead time for making changes.
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You have a 1985 therefore it might be mechanically driven.
In that case, you can change the driven gear in the transmission.
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Happy Racing!
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If People Drove Any Slower They’d Be Going Backwards
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It was an attempt to make you drive in slow motion.
Also you’ll notice the very slow speed of 55 is in a different color on your speedometer in an attempt to remind drivers if you reach 56 MPH the World will explode.
The above nonsense was repealed in 1981.
However there is lead time for making changes.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
You have a 1985 therefore it might be mechanically driven.
In that case, you can change the driven gear in the transmission.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
If People Drove Any Slower They’d Be Going Backwards.
Last edited by NINÅ; Aug 10, 2010 at 02:13 PM.
Thread Starter
Senior Member
Joined: Jan 2008
Posts: 564
Likes: 11
From: Albuquerque NM
Car: 1985 Camaro Z28
Engine: 5.7 LSX
Transmission: Performabuilt 4L60E
Axle/Gears: Strange 12-bolt 3.73
Re: Speed Limit - Depends On The Restrictor Plate
ok cool. so is that a pretty easy thing to do? like can i reasonably do it myself with a little bit of common sense? or am i better off having someone do it for me?
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Speed Limit - Depends On The Restrictor Plate
One way is to retain the present speedometer, change the trans gear, and read off what is now the KPH scale.
That would render a 160 MPH speedometer at pin.
The other way is to install the 140 MPH faced speedometer then change the trans speedometer gear.
Also, because you want to change the differential gears, you should do that first so you won’t have to change the trans speedometer gears twice.
Yes however it does involve draining some fluid and you might have to replace the O-ring so have a new one available.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
8 Wheels Corner Better Than 4, If You’re On The Outside You Have Fair Warning
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That would render a 160 MPH speedometer at pin.
The other way is to install the 140 MPH faced speedometer then change the trans speedometer gear.
Also, because you want to change the differential gears, you should do that first so you won’t have to change the trans speedometer gears twice.
can i reasonably do it myself with a little bit of common sense?
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
8 Wheels Corner Better Than 4, If You’re On The Outside You Have Fair Warning
.
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