6-speed with KA-T?

[klattr1]

as far as transmission options go, i would definitely go with the Z32 5-speed transmission before the Z33 6-speed...(durability-wise)...but that still doesnt help what Greg was askin about...stock 4.08 VLSD would be the way to go for the power he's bout to make...

[DanCouga]

Just running the numbers with the supra six speed, you would be in higher rpms in 6th than you would with your current 5 speed.

You need a top gear with less than a 0.75:1 ratio to get under 3,000 rpms @ 70mph with your current tire/final drive setup.

You could always try a C6 Z06 transmission. But with your 4.36 final drive, you will NEVER achieve your top speed!

[EazyBreazy]

isnt the vette transmission in the rear of the car a la trans axle style

[DanCouga]

I had forgotten about that

[AZhitman]

as far as transmission options go, i would definitely go with the Z32 5-speed transmission before the Z33 6-speed...(durability-wise)...but that still doesnt help what Greg was askin about...stock 4.08 VLSD would be the way to go for the power he's ALREADY making...

Fixed.

[TheOne]

isnt the vette transmission in the rear of the car a la trans axle style

yes it is!(started in the C5), tho the camaro & mustang svt cobra's are normal T-56's, i don't know about the viper but you can get viper spec T-56's for the cobra's(maybe thats just viper spec gear ratio, or maybe the viper's isn't a trans axle)

[ShionS14]

well now if you really wanted to i would get the s15 6spd bell housing and then put this in there http://www.quafe.co.uk/catalogue/page55.htm

[jdm_master_X]

well now if you really wanted to i would get the s15 6spd bell housing and then put this in there http://www.quafe.co.uk/catalogue/page55.htm

its actually http://www.quaife.co.uk/catalogue/page55.htm

and with dog engagement type transmissions, expect a really harsh engagement and lots of noise.

if you go to http://www.takakaira.co.jp, in the performance parts section, look at the HKS dogmissions. you might find some interesting things there as well.

[onosqv]

If you feel like spending around 5k, there's a "drop-in" transmission... I talked to the guys @ turbo240.com about the c4 transmission w/ overdrive.

You can get it w/ overdrive for each gear... hence, getting 6 gears.

I've been waiting for them to release the kit, but they only release a couple things, like the transmission cross member, etc. Seems they have more important things to do. But I'm sure if you tell them you are interested, they'll bust one out right quick .

But really tho, like everyone else said, it's the 4.36 diff that's killin you. You should experiment w/ the gear ratios tho... supposedly, the lower ones, like 3.96 (like mine ), will allow you to stay in boost longer since it's a taller ratio, of course, it will be slightly more lag... who knows.

[Shift_Alabama]

here you go hitman.... http://www.nismoparts.com/catalog/?section=241

SWEET link, like to drop that into my transmission!

[watty]

Hey Greg, What did you finally do?

Watty

[Edub1]

Like the 275/40/17's that are on there?

I like this idea of building a spare trans with a higher 5th gear.... Anyone familiar with the exact part?

The J30 rear is a bit taller but not much. Some Q45 rears are a lot taller. I forget what year fits but If you are putting down 300+ HP, the Q45 should work real nice. I'd love to find one myself.

What size wheel and offset do you have those tires on? Pictures?

[AZhitman]

Hey Greg, What did you finally do?

Watty

To whom?

[AZhitman]

The J30 rear is a bit taller but not much. Some Q45 rears are a lot taller. I forget what year fits but If you are putting down 300+ HP, the Q45 should work real nice. I'd love to find one myself.

What size wheel and offset do you have those tires on? Pictures?

J30 rear is 3.96.

Q45 (G50) rears are ALL 3.56. I have one I could always sell ya.

Pics in the vert forum, rear wheels are 17x9, like a 35 offset.

[Edub1]

If you don't want it. What year? How much?

[Chezedik]

dub glad to hear your not dead. Greg, I think they meant to fix your prob.

[AZhitman]

LOL - I haven't done anything yet... Still waiting for a REALLY good solution...

Looks like it might be more difficult than I planned.

I *may* try a different rear ratio, but that first-gear launch is gonna be hard to give up - it's addictive!

[hannibal]

Stock 4.083 or J30 3.916 should still put a smile on your face. Cant believe F-body T56's 6th gear has a higher ratio than a KA's 5th gear.

Maybe I missed it, but how many rpms are you running in top gear?

[AZhitman]

Not sure, I gotta check.

Speedo is outta whack, so it's hard to equate a speed with an RPM...

[enigma2103]

im with everyone else, lower your rear ratio and you should see results.

[Chezedik]

Stupid Q, can't you call a trans shop and see if they will add two more gears to give you a six speed. If there is room in the case, then they should just have to change the shift plate, and add some gears. If not, you could maybe mill the case out.

[EazyBreazy]

if he adds 2 gears wouldn't that be a seven speed? hmmm i kinda like the sound of that

[Chezedik]

No, you would have to add a gear to the main shaft and one to the counter shaft in order to add a speed.

[mkory]

Not sure what to tell ya, Greg. I like the swapping 5th gears idea, but you're going to be hard pressed to find a taller one that fits.

[Edub1]

A J30 rear is only 4% taller. This should be unnoticable in 1st. The Q45 rear is 15% larger which might slow you out of the hole. But that is 15% more power band you will have at the top of 1st gear - so you kind of get it back.

Plus, do you even get any usefull boost in 1st?

If you already have a 97-01 q45 rear, give it a shot.

[BOOMSHAKALAKA]

Not sure what to tell ya, Greg. I like the swapping 5th gears idea, but you're going to be hard pressed to find a taller one that fits.

I saw a 5th gear kit on a website that sells Nismo parts this morning. I don't know if it's taller though.

[UncleBen]

Great thread, i've wanted a 6spd KA for years.

I also have the 4.36 gearing; spins that KA something awful on the interstate!!! Gotta love the instant torque and power though heh.

[Edub1]

Is first at all usefull with that gear?

Mine seems too short with the car bone stock.

[Chezedik]

No, it is shorter.

[hannibal]

A J30 diff is 10% taller than the JDM 4.36 rear. Revs would drop from 4000rpm to 3600rpm. Not that much of an improvement, but cheap and easy compared to adding a gear or adapting a 6 spd transmission