I have a 2011 GT with 331. Was thinking of going 373. I am running mt82 all motor setup with Boss IM. What are the pros and cons if anyone has done them. Thanks is advance!
Gear Swap
- Thread starter slverstang
- Start date
Pros: Faster acceleration, fun to drive on the street
Cons: Fist gear is almost useless, you have to shift a lot, lower top speed, lower mpg, might not be the best for higher HP cars do to traction
Cons: Fist gear is almost useless, you have to shift a lot, lower top speed, lower mpg, might not be the best for higher HP cars do to traction
Anyone else
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I hate my 3.73s - I'm pulling them out and switching to 3.31s in the next couple weeks. Have to shift into 5th at the track, first gear is useless, almost shifting into 6th at the 1/2 mile, annoying on the street.
Paul.
Paul.
Whats your redline and your trap?
Stick with the 3.31 and use a 26" tire, should be perfect. I also have a 3.31 and pass the traps in 4th at 6800 rpm or so. With the boss manifold, you will have a little more RPM in the other gears to use so you'll probably pass around 6700 or so in 4th.
I like my 373 rear. Factory equipped. I'm staying n/a, and I have a GT350 manifold so I can run out 4th at the track. I skip 2nd and 4th gear in normal driving.
Probably won't make a difference but I have factory 3.55 in mine I love them.
Limiter is 7000. Trap is 125. Even before the blower I hated them. I need 29" tall tires to stay in 4th on a completely stock car. Ridiculous.
I'm not a huge fan of my 3.73s either. They almost always whine because so few people take the time to set them up right. 1st gear is pretty useless unless you have drag tires. Cruising RPM on the highway is high enough where your exhaust starts to get loud, which kind of sucks for long trips. If you do any sort of highway/roll racing the extra shifting is a disadvantage.
The only time I'd get them is if you're drag racing a lot and want to counteract a taller tire or finish at a certain RPM.
The only time I'd get them is if you're drag racing a lot and want to counteract a taller tire or finish at a certain RPM.
You really need to use an online calculator for this. I know a lot of guys that do a gear swap, going numerically higher and love it on the street. Hit the track and hitting the traps way out of your power band. Then they have the dilimma to keep that gear for the streets, swap the gear or try a different height tire.
With a boss im you want to trap at least somewhere in the 7500 range. If not or you don't want to hit it that high, I would go back to the stock intake.
With my auto, I trap in 3rd around 7800 when I had my boss im. And now that it's back on, be the same.
With a boss im you want to trap at least somewhere in the 7500 range. If not or you don't want to hit it that high, I would go back to the stock intake.
With my auto, I trap in 3rd around 7800 when I had my boss im. And now that it's back on, be the same.
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I had the chance to run at the strip a couple weeks back....
Staying in 4th, I'm going through the traps right about 7500, thats with a 27.5 in tall tire. Speed is 114 almost 115.
Staying in 4th, I'm going through the traps right about 7500, thats with a 27.5 in tall tire. Speed is 114 almost 115.
That's perfect for your GT350 IM.
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