I'm switching to an aftermarket speedometer for my Trans Am and am wondering if it is a 5" speedo or 3" 3/8 speedo. Thanks.

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1984 Trans Am, Goodwrench 350, TES Headers, Performer RPM Intake, Flowmaster 80 Series, Holley 600 cfm & vacuum advance, and T5 with short shift

 

Neither

 

Ok, what size then?? Can anyone help me out??

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1984 Trans Am, Goodwrench 350, TES Headers, Performer RPM Intake, Flowmaster 80 Series, Holley 600 cfm & vacuum advance, and T5 with short shift

 

I've never measured it, but I would say 5", I'm not at my car right now, but I have a 5" tach and from what I can remember it seems to be the same size as the speedo.

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"Rice burners are like tampons...Every pu$$y has to have one"
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

The Camaros have about a 5 inch tach/speedo, but I am not sure about birds. Why don't you mesure it? You can't really go by aftermarket mesurements, stock ones don't use any of those standards. Depth is something else to consider.

 

Do a search of the archives. I had posted a thread about a month ago in the electronics board (I think) about custom instrument clusters. Someone has done this in the past, and I'm sure he'd be more than happy to tell you size he bought. He's got lost of pictures too. Very nice looking!!!

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http://www.gruveb.com/z28

 

Technically it's a little smaller then 5"'s but you really can't just pullout the old speedo and put in a new one. The cluster prevents you from doing so. I ended up mounting my gauges to the outside trim panel. the Tach and Speedo were 5 inches the other gauges I went with 2 1/16. You'll also need a new speedo cable as aftermarket gauges use a threaded cable while the stock is a push in. Not too mention you'll need a couple of inches in length.



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1985 ASCD Ram Air Trans Am
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