Readings on 3.55 gears vs stock gears

Viper44

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I did a search but for some reason couldn't come up with anything. I assume this has been discussed before so I found that weird I couldn't find what I'm looking for. Well to the point, can someone tell me what readings they are getting MPH at what RPM reading in a certain gear either for stock gearing or with a 3.55 rear end in it? I believe I have a stock gear in my car but for some reason I thought the cars (stock) ran at a lower RPM at a set speed. I didn't take any readings but if someone can either tell me what they are seeing (RPM vs speedo) and in what gear I can check mine. This can be either for a stock or 3.55 rear end and I can compare. Thanks for any help you may be able to provide. Also if there was a thread about this with readings that I didn't come across maybe you can post a link to it.
 

alpha85

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I have 355's in a 05. I'm not in 1st very long probably only about 45 or 50. 70mph in 5th gear is about 2100rpm. 70mph in 6th is about 1800rpm.
 

agentf1

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Put a mark on your driveshaft and then spin your tire 1 full revolution and count how many times your ds spins. If it spins 3 1/2 times you have 3.55's. If it spins just a tad over 3 times it is a 3.08. This is the best way to tell what rear you have. If you go by gear/mph then tire size also comes into play. I hope this helps.
 

dodgefever

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3.55 gears in my '99 GTS. At 40 MPH in second gear, it's turning 3500 RPM. At 40 MPH in third gear it's turning 2500 RPM. Hope that helps.
 

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