6 Speed Options Gtst Rwd R34 Getrag? Z33?

[BLITZ-26]

looking at some options to convert to a 6 speed box for a bit more strength and better gear ratios for my RB26 car in the build its one of the last things i need to sort out.

currently have a R34 GTT box which is good but i would like to go 6 speed so what are my options ?

R34 GTR box and cut the transer case off?

350z / 370Z box and cut and shut or adapter plate if they make one..... i can find them for SR20 but not RB

or some thing silly like a T56 or supra box cut and shut?

has anyone done anything like this or is it uncharted territory ?

[NutR33]

Have a look in the build threads, it's on the second page, I think the guy is in the NT.

[BLITZ-26]

had a look could find anything, think a getrag is my best option atm just to find one i can cut the transfer case off

[MagicMikeZ32]

350 boxes are made of glass. Avoid.

How much powers are you planning?

[gtr jet]

http://www.rodshop.com.au/index.php/bellhouings/holden-rb30/gm-tremec-t56-to-rb30-rb20-rb25-rb26.html

[Hattori Hanzo 69]

i have a 6 speed getrag i essentially only want the spare transfer case off if you are interested.

[Ben C34]

The t56 seems like the logical choice. They are cheap enough and readily available.

They are rwd boxes.

The crs kit is pretty good as it includes clutch and cross member, the going rate for a r34 gtt box on its own would be more than the crs kit and a t56 plus factor in transfer care mods, then if you bust the t56 its cheap to replace.

[zebra]

Only problem with that is, a 2.5/2.6 RB would never pull the double overdriven 6th gear......6L super charged commodores can't with 4.11 gears, 8L dodge vipers can't either

So, you would need to buy the close ratio TR6060

[Ben C34]

True. The crazy ass overdrive 6th is whack.

Using the available gears wasn't part of the original post though.....

Edited February 26, 2015 by Ben C34

[zebra]

Well....yeeah...who wouldnt want a really heavy wide ratio 5 speed that has a down hill over 140km/h extra gear

lol

[GTSBoy]

Get a Mazda 5+:1 diff into it.!!!!!!111!!!

[gtr jet]

I'm pretty sure BA MKII's and BF's run T56's with the closer ratio's don't they? My mates BA sits on almost 2000rpm in 6th at 100.

[zebra]

Yeah, Thats because they are the TR6060 version

[gtr jet]

I didn't think Falcons got the TR6060 till FG?

[PN-Mad]

350 boxes are made of glass. Avoid.

How much powers are you planning?

I thought they were pretty strong? I know the early models had the weaker syncros that were later rectified in 2004.5, but I thought the gears were pretty stout.

Any examples?

[zebra]

I didn't think Falcons got the TR6060 till FG?

Hmmm, you may be correct......

[MagicMikeZ32]

I thought they were pretty strong? I know the early models had the weaker syncros that were later rectified in 2004.5, but I thought the gears were pretty stout.

Any examples?

Could be the case. No particular examples, my info is based purely on n00bs with Z32's wanting a 6 speed. Regular factory (and a bit) tourques might be ok. More than that I wouldn't risk it personally.

[BLITZ-26]

Digging up my old thread

Power say 500kw

I have got a t56 or from a R8 clubsport looks like a tr6060

Gear ratios seem to match up same as a r34 gtt box when i put them through the calculator with a 4.11 diff the 6th was obviously longer and looked like it would sit at the 2,000 rpm mark at 110 which with my engine at 9.1 and e85 shpuldnt be to much of an ask

[BLITZ-26]

As above the cost of the 350z 370z and the getrag is alot and if i do break a box thats what makes the t56 or tr6060 a stand out, there are heaps and even near new boxes are the same price as a 15 plus year old rb box

[Dose Pipe Sutututu]

has it been fitted? I'm curious to see how it fits