Firebird with T-350 speedo gear change question - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-07-2012, 09:38 PM
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Firebird with T-350 speedo gear change question

I changed from 241 to 308 rear end and changed speed about 15 mph faster than should be . Any idea what gear I should change to ? I have a firebird w/th350 !! Thanks

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Old 06-08-2012, 01:08 AM
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Quote:
Originally Posted by f/bird
I changed from 241 to 308 rear end and changed speed about 15 mph faster than should be . Any idea what gear I should change to ? I have a firebird w/th350 !! Thanks
If you are 15mph faster at 15mph, then double the gear teeth. If you are 15mph faster at 30mph, then multiply the gear teeth by 1.5. And so on.
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Old 06-08-2012, 05:56 AM
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It seems to be about 15 mph. at around 55 mph. I drive at 65 to 70 mph. to maintain a 55mph. according to driver that follows . Thanks for the feed back
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Old 06-08-2012, 08:24 AM
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Sounds like you're about 20% off. Here's a link to a speedo adaptor.
http://www.ebay.com/itm/NOS-AC-DELCO...41f1fe&vxp=mtr
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Old 06-09-2012, 04:46 PM
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http://www.transmissioncenter.net/sp...n_______va.htm

This will tell you.
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