85 Mph to 140 speedo

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Apr 7, 2001 | 11:22 PM

birdofprey83

Thread Starter

Member

Joined: Apr 2001

Posts: 129

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From: Denver, CO

Car: 1989 Firebird

Engine: 2.8

Transmission: Auto

85 Mph to 140 speedo

how hard would it be to change the 85Mph speedo in my 86 firebird to the 140 Mph speedo found on the turbo firebirds
It is not cable driven

thanks

------------------
Chuck
-------------------
I'm not shy, I just
observing my prey.

Apr 10, 2001 | 05:44 PM

4SPEED

Junior Member

Joined: Mar 2001

Posts: 39

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From: ORLANDO FL USA

change the face, regear the the drive inside the transmission and install a custom prom or buy one from gm as the ecm reads the vehicle speed sensor and controls everything based on that

Apr 11, 2001 | 01:00 AM

Kevin91Z

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iTrader: (1)

Joined: Jul 1999

Posts: 10,950

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From: Orange, SoCal

Car: 1990 Pontiac Trans Am

Engine: 355 TPI siamesed runners

Transmission: Tremec T56

Axle/Gears: 12-Bolt 3.73

I'm sorry 4speed but you are not correct. The speedo swap is a direct plug and play for an 86 to 89 speedo, as both are electronically controlled. The circuitry is contained in the speedo and will read correctly with no other changes.

------------------
West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

Apr 11, 2001 | 08:52 AM

birdofprey83

Thread Starter

Member

Joined: Apr 2001

Posts: 129

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From: Denver, CO

Car: 1989 Firebird

Engine: 2.8

Transmission: Auto

Quote:

<font face="Verdana, Arial" size="2">Originally posted by Kevin91Z:
I'm sorry 4speed but you are not correct. The speedo swap is a direct plug and play for an 86 to 89 speedo, as both are electronically controlled. The circuitry is contained in the speedo and will read correctly with no other changes.

</font>

Thanks!

------------------
Chuck
-------------------
I'm not shy, I just
observing my prey.

don't forget the Firebird is an F-Body TOO

Aug 22, 2001 | 05:36 PM

m3baller

Member

Joined: Jun 2001

Posts: 242

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From: RI

I have a 120 mph speedo in my 88 firebird right now.

i might buy the 140 mph speedo cluster.

is this a direct bolt in?

Aug 23, 2001 | 12:08 AM

Omar

Senior Member

Joined: Jul 1999

Posts: 994

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From: San Diego, CA

Yes.

------------------
1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

Aug 23, 2001 | 08:15 AM

Willie

TGO Supporter

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Joined: Jul 1999

Posts: 2,926

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From: Tucson, Arizona USA

Car: 1987 Z28 Convertible

Engine: 305 TPI

Transmission: 5-speed

I just happen to have a 140-mph speedo cluster out of a 1986 T/A. The speedo is electronic. If anyone is interested, I'll sell it cheap. E-mail me.