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What are these and what will they do? Bc I was gonna get 3.73 gears for my car
 

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if you have an 8.8 rear end from a gt then they can work..
 

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well you have to pull a gt rear end and swap into your car to use them, and then even at that those are 3.27 gears which is the same ratio that's in your car right now
 

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3.73's if you do a decent bit of highway mileage
 

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you should be able to determine the gear ratio of your current rearend one of three ways:
1. door tag
2. rear end tag (should say something like 3.L27 if its currently 3:27 gears, if its 3.L55 (3:55's). 3.L73 (3:73's) and so on and so forth. the L indicates locking differential
3. jack up the rear of your car and rotate the tire/wheel one full round and see how many times your drive shaft rotates...you can make a "white out" mark on both to determine how many revolutions.

with an automatic most prefer 3:73's on a daily driver other more aggressive drivers prefer 4:10's.

hope this helps...
 
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