swapping speedo units in a 85TA
02-22-2001, 01:34 PM
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Car: 85&95 Trans am
Engine: 85-LT1 95-LT1
Transmission: 4l60e & 4l60e
Axle/Gears: 3.23 & 3.23
swapping speedo units in a 85TA
I have a 85 Trans Am with the 85mph speedo unit. I want to install a 140mph speedo unit in it's place. How hard will this be to do? The original unit has a cable driven speedometer and the rest looks like a circuit board on the back.The tach yellows at 5500 & redlines at 6000. If it doesn't just swap in what kind of rewiring would I be looking at?
02-22-2001, 05:18 PM
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Car: '92 Z28; Dk Teal; Her Pkg
Engine: 305
Transmission: Richmond 6 Spd
Axle/Gears: Moser 9", Detroit Locker, 3.70
Once you find a speedo, the swap is simple. You may reset the odometer in the 145 speedo to read the correct mileage, or swap the odometers in the speedos.
Tim
Tim
03-02-2001, 12:13 PM
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Car: 1985 Trans Am
Engine: 305 TPI
Transmission: 700R4
Tim:
If I'm not mistaken, there are no cable driven 140mph speedos for the Firebird, only the Camaro. The electronic 140's came out in the 86 Trans Ams.
------------------
Kevin Irving
85 Trans Am WS-6, 305 TPI, custom burned '86 PROM with '87 "165"ECM, Accel Supercoil & 8.8 Wires, MSD 6AL, Aluminum Driveshaft, TB Coolant Bypass, Ported Plenum, Modified MAF, Syclone Fuel Pump, JET Airfoil
15.556 @ 86.65mph, Nov 10, 2000.... I know it sucks.. but it will get better!
http://www.geocities.com/transam85tpi/
If I'm not mistaken, there are no cable driven 140mph speedos for the Firebird, only the Camaro. The electronic 140's came out in the 86 Trans Ams.
------------------
Kevin Irving
85 Trans Am WS-6, 305 TPI, custom burned '86 PROM with '87 "165"ECM, Accel Supercoil & 8.8 Wires, MSD 6AL, Aluminum Driveshaft, TB Coolant Bypass, Ported Plenum, Modified MAF, Syclone Fuel Pump, JET Airfoil
15.556 @ 86.65mph, Nov 10, 2000.... I know it sucks.. but it will get better!
http://www.geocities.com/transam85tpi/
03-02-2001, 06:38 PM
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I have the same problem
Has anyone seen a speedo fpr the 85 ta.
If I can find an 85 iroc will that work
Ronald
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85transam 305 TPI 210hp
Has anyone seen a speedo fpr the 85 ta.
If I can find an 85 iroc will that work
Ronald
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85transam 305 TPI 210hp
06-20-2003, 08:20 AM
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Car: 85 T/A
Engine: 350 TPI
Transmission: T5
I swapped my cluster over to a 140. The 85mph cable driven cluster is completly different than the 140mph electric cluster. To do the swap you will need to rewire the two connectors and add a buffer box. I cut the traces on the curcuit board and spliced them to the correct loaction.
As for resetting the odometer you take the face off the spdo, release the pin for the numbers, turn the numbers to what you want and put the pin back in.
As for resetting the odometer you take the face off the spdo, release the pin for the numbers, turn the numbers to what you want and put the pin back in.
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