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Discussion Starter #1
ok i have a 331 with a gt4785 turbo the car has a powerglide ,3.31 gears and a 28 inch tire ..i talked to a guy yesterday that recomended 4.10 said they helped his turbo car out a ton and these guys do alot of testing .run mostley 8th mile stuff .with the 3.31 gears the car would kinda stop pulling when i went into high but was not slipping at all .
 

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Define stopped pulling. What was your mph difference 1/8 mile to 1/4? What rpm do you shift and trap at? 3.31's might be too tall, but 4.10's are super short gears. Ok if you're a half tracker, but I doubt you could take them out the backdoor.
 

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Discussion Starter #5
we have a 600 ft track here and its been 5.50 at 117 on pump gas and 15lbs . the car just flat lines once i go into high gear ,i put the 4,10 in so if there to much ill look futher .it just doest keep pulling once i go into high gear
 
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