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700R4 Speedometer Gear Change

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Old 03-08-2015, 09:39 PM
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Car: 88 GTA ZZ383
Engine: ZZ383
Transmission: 700R4
Axle/Gears: 9 Bolt with 3.73
700R4 Speedometer Gear Change
I have an 88 GTA with 700R4 and Borg Warner 9 Bolt 3.27 (GW6 code). I just rebuilt the rear end and changed gears to 3.70. Does any one know what size speedo gear I need to calibrate my speedometer with the new gears. Tire size is 255/50 16R. Thanks
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Old 03-08-2015, 10:26 PM
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Car: 1987 iroc
Engine: 383 TPIS intake, Dyno Don headers
Transmission: 700R4 w/Pro-built Auto/transgo 2-3
Axle/Gears: 3.27/3.70 borg warner 9 bolt
Re: 700R4 Speedometer Gear Change
You need to know what speedometer gears are in the tanny now then use the speedo calculator in this site and order gears. http://www.transmissioncenter.net/sp...__va.htm#700r4
Last edited by red rock; 03-08-2015 at 10:29 PM.
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Old 03-08-2015, 11:00 PM
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Re: 700R4 Speedometer Gear Change
This may help.
Attached Thumbnails 700R4 Speedometer Gear Change-speedometer-gears.png  
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speedo gears.doc (24.5 KB, 88 views)
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Old 03-08-2015, 11:44 PM
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Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: 700R4 Speedometer Gear Change
Welcome to TGO, Hawkit1.

The stickies at the top of the page might prove useful.

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Old 03-17-2015, 10:18 AM
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Car: 88 GTA ZZ383
Engine: ZZ383
Transmission: 700R4
Axle/Gears: 9 Bolt with 3.73
Re: 700R4 Speedometer Gear Change
Thanks for the help everyone
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Old 03-21-2015, 12:05 AM
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Car: 1980 Regal
Engine: 383 Superram
Transmission: 700R4
Axle/Gears: 12 bolt w/ 3.31 posi
Re: 700R4 Speedometer Gear Change
15T and 43T will get you dead on.
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