1998cobrasvt
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T45 or T56.
Is it more street, or more track?
1) More street: go with the T45. Less overall shifting required, and depending on your gearing, you will most likely never use 6th gear, even on the highways. And for the track use you do get, depending on your seat time/experience/hours spent you will have many other things to worry about before the gearing becomes an issue. Again, depending on gearing, 5th gear will be useless on the track. Whether this is an issue or not depends on how long the straights are and how quickly you get up to speed. As you get faster and faster (if you aren't already) you will probably run out of gear, which leads to....
2) More track: go with the T56 hands down. The additional shifts can be annoying, but the whole point of more gears is that it allows the gear ratios to be closer to each other (close-ratio) which is ideal for racing. It allows the driver more options for gear selection to keep the car in the powerband whether you are on a straight or a hairpin. For a straight dedicated track car, 6th gear should be close to 5th as opposed to an "overdrive" gear. However, for a car that also sees street time, the extra 6th gear lets you have a close-ratio trans (1st through 5th) for the track, with an overdrive 6th for the highway (better mpgs, maybe). The 5 speed, because it has one less gear, by default must have a wider gear spacing to be as useful in the different street/track scenarios.
My recommendation is to go with the T56, assuming you can get a close-ratio 1st through 5th (I don't see why you wouldn't be able to). Even if you drive it on the street mostly, the minor inconveniences are just that - minor. Things I think you'd forget about pretty quickly. FWIW, my daily driver is a 6 speed and I have no issues with it.
Edit: If I had the money I'd drop a T56 into my Mustang in a heartbeat.
:thumbsup:
My thoughts as well. Thank-you for your detailed response!
Have 373's currently. Close ratio shifting benefits are what is leaning me towards the t56. If the only negative is extra shifting i'm perfectly ok with that. Will keep an eye out for one, hopefully it will be going in this winter along with a few other goodies :grin:
Oh, to clarify a little more - the 5th gear on the T45 will be useless on a track assuming it's an overdrive 5th gear (meant for cruising on the highway). You can get T45's with a close ratio 5th gear that will work great on a track, but then of course kiss any kind of decent mileage on the street goodbye.
People are soooooo eager to spend someone else's money. Judging by your mods, I'd say keep it a T45. I've got a stock T5 in my car and I make almost 100 whp more than you, and road race the shit out of my car. If the shifts are nice and easy, you will never break anything. Mine has been refreshed at around 200k miles, right now has about 42k since than, and 4k of track time since the motor build, 0 problems. With 3.73s, and 32v motor, you should still have a LOT of range without needing to go into 5th. So, let's see... spend like 2500 bucks on a T56 swap with nearly 0 performance gain, or spend 300 bucks to rebuild your transmissions, IF YOU NEED IT... seems like a really tough choice
T56 easy imo just for overall enjoyment. I like mine so much more than my T5 it's not even close. You may not NEED it, but the gearing is much more usable for racing and cruising.