Th400 gear choice
Th400 gear choice Im planning on converting from a t56 to a th400 later this year.
Was wondering what would be a good gear choice for both street driving and track duties?
Was wondering what would be a good gear choice for both street driving and track duties?
The tire size make a pretty significant difference to the rpm at cruise on the street.
On the track we just try to setup the gearing to go across the stripe at max engine rpm. So we pick a tire that will fit and hook, determine the engine's max rpm, and gear around that.
On the street it depends on what you can tolerate for cruise, how often it will be highway driven, and at what speeds.
If you want to get on the highway and run 75-80 for very long, you will want to run a 2.70- 3.30 ish gear. Usually not real good for acceleration or 60'.
That's where the overdrive units shine but they cost more and can add complexity.
3.42-3.73 is usually the best trade-off gearing.
On the track we just try to setup the gearing to go across the stripe at max engine rpm. So we pick a tire that will fit and hook, determine the engine's max rpm, and gear around that.
On the street it depends on what you can tolerate for cruise, how often it will be highway driven, and at what speeds.
If you want to get on the highway and run 75-80 for very long, you will want to run a 2.70- 3.30 ish gear. Usually not real good for acceleration or 60'.
That's where the overdrive units shine but they cost more and can add complexity.
3.42-3.73 is usually the best trade-off gearing.
The tire size make a pretty significant difference to the rpm at cruise on the street.
On the track we just try to setup the gearing to go across the stripe at max engine rpm. So we pick a tire that will fit and hook, determine the engine's max rpm, and gear around that.
On the street it depends on what you can tolerate for cruise, how often it will be highway driven, and at what speeds.
If you want to get on the highway and run 75-80 for very long, you will want to run a 2.70- 3.30 ish gear. Usually not real good for acceleration or 60'.
That's where the overdrive units shine but they cost more and can add complexity.
3.42-3.73 is usually the best trade-off gearing.
On the track we just try to setup the gearing to go across the stripe at max engine rpm. So we pick a tire that will fit and hook, determine the engine's max rpm, and gear around that.
On the street it depends on what you can tolerate for cruise, how often it will be highway driven, and at what speeds.
If you want to get on the highway and run 75-80 for very long, you will want to run a 2.70- 3.30 ish gear. Usually not real good for acceleration or 60'.
That's where the overdrive units shine but they cost more and can add complexity.
3.42-3.73 is usually the best trade-off gearing.
Staging Lane
Joined: Jul 2006
Posts: 93
Likes: 0
From: Hicksville NY
I run a 3.42. The car is a little rev happy at 70 on the highway but im also running a 26" tire. I think a 28" will help cure that. Overall im very happy with the gear choice, the car pulls like an animal even in 3rd at 20 mph. for refrence car has a tt 383 with 5k stall.
Trending Topics
Im going to end up running a street tire 99% of the time unless im at the track or just haven't had the time to take the slicks off.. Could I get away with a gear in the 3.20-3.30 range?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo
I run a 3.25 gear on my turbo build with a 28" tall tire. It is not that bad on the freeway really and I also run a TH400. Turbo's love the load that a low numerical gear puts on the engine anyway to help them spool so I would think you will be right at home in that range.
He didn't state what he was running for street tire, nor did my statement depend on anything he said or anybody's guesses.
OK cool, For a street tire ill either be running a an et street or toyo r888. Im either going to stick with a 17 inch rim or bump up to an 18 inch rim i can't decide yet.
