are all of the 145mph speedo's electric?
Thread Starter
Joined: Jul 2002
Posts: 230
Likes: 1
From: Smithfield, VA
Car: 85 Tojan
Engine: ZZ4
Transmission: T56
Axle/Gears: 9", 3.50
are all of the 145mph speedo's electric?
are all of the 145mph speedo's electric or were some the mechanical type. When did gm go from the mechanical to electric speedo's?
Joined: Aug 2001
Posts: 723
Likes: 0
From: Newfoundland, Canada
Car: 1987 Camaro IROC-Z
Engine: L98 bored .40 (357 ci)
Transmission: Race Ready 700R4
Axle/Gears: 9 bolt 3.70 posi
My 87 IROC has the 145 MPH speedo and it's mechanical.. I think they might have went electric in 1990 when they changed the cluster style.... or was it 91, 92? Not exactly sure 
Senior Member
Joined: Feb 2004
Posts: 860
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From: Albany, NY Area
Car: Red on Red 89 RS
Engine: LO3 305 TBI
Transmission: TH-700R4
Axle/Gears: 10-bolt / 2.73
correct. 90-92 is electronic. earlier model 3rd gens with an overdrive transmission have a speed sender built on to the back of the cluster, which sends the VSS signal to the computer for torque converter lockup control.
Assuming you're talking about Firebirds rather than Camaro...
The 140 speedo came out in 86. They're all electric even though in 86 you could get a mechanical speedo in the other sub-140mph clusters.
The 140 speedo came out in 86. They're all electric even though in 86 you could get a mechanical speedo in the other sub-140mph clusters.
Thread Starter
Joined: Jul 2002
Posts: 230
Likes: 1
From: Smithfield, VA
Car: 85 Tojan
Engine: ZZ4
Transmission: T56
Axle/Gears: 9", 3.50
thanks for clearing that up. I think i found a good electronic one. I needed electronic due to my t56 swap.
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