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Transmissions and Drivetrain Need help with your trans? Problems with your axle?

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Old 04-14-2009, 02:37 PM   #1
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Join Date: Jan 2008
Location: Pittsburgh, PA
Posts: 473
Car: 1986 Trans Am, 1985 Trans Am
Engine: 400 SBC, H.O. 305
Transmission: TH400, 700R4
Axle/Gears: 10 Bolt/3.73s, 10 Bolt/3.73s

Classifieds Rating: (6)
Swapping TH400 In -- Want Speedo To Read

Ok to start off my car was originally a 2.8l / 5 Spd car. I am now in the process of swapping in a 400 SBC and TH400. Before I had the 120 MPH V6 Cluster, but I have switched to the 140 MPH GTA V8 cluster.

My question is what all do I need to buy to get the speedo to read correctly for my TH400 Tranny?


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Old 04-14-2009, 03:08 PM   #2
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Join Date: Jul 2003
Location: KY
Posts: 1,236
Car: 87IROC, 740iBMW, 328iBMW, 86GMC
Engine: 5.7, 4.4LV8, 2.8, 6.0
Transmission: Manuals & Auto's
Axle/Gears: 3.27, 3.42

Classifieds Rating: (0)
Re: Swapping TH400 In -- Want Speedo To Read

[quote=Stippy17;4120369]I have switched to the 140 MPH GTA V8 cluster.

QUOTE]

Cluster is out of what year vehicle? BTW, check the tech section on this site. There's a great How To article that addresses Trans Am electronic cluster swap. Even has wiring id to boot. Very helpful if that's what your working with?
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Old 04-14-2009, 03:30 PM   #3
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Join Date: Jan 2008
Location: Pittsburgh, PA
Posts: 473
Car: 1986 Trans Am, 1985 Trans Am
Engine: 400 SBC, H.O. 305
Transmission: TH400, 700R4
Axle/Gears: 10 Bolt/3.73s, 10 Bolt/3.73s

Classifieds Rating: (6)
Re: Swapping TH400 In -- Want Speedo To Read

Not sure what year GTA the cluster is out of, but I already have it in my car. Ill check the Tech Section, but Im looking more for how I get my TH400 (Which is I believe set up for a cable speedo) to work with an Electric Speedo like our cars have. I know I need an adapter, but I was hoping someone had a part number of one that would work, and if there is anything else besides the adapter Ill need.
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Old 04-14-2009, 03:30 PM
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1990, 373, 400, camaro, electric, gears, lt1, make, problem, sbc, speedo, speedometer, swap, swapping, th400, turbo, work
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