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Thinking Of Putting An R34Gtr Box In An R33Gtr.. Good Idea?

Country Cruzin
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Country Cruzin Collaborator

Country Cruzin

Posted
Posted

My car now has a stuffed clutch an think there has bn a stuffed synchro on fourth gear for a while so want to get them both fixed at the same time. but the car has done 150,000km an not sure if the gearbox would be worth fixing, or if i should look into putting an r34gtr box in, as they should be a lil newer and ive bn told they are a stronger box then the 33? not sure if thats true or not. currently running bout 460hp atw. But im not sure of the price of a 34 box as i havent seen any for sale, an how much itd cost to make it fit. any thoughts/advice would be appreciated. also are the diff ratio's much the same in a 34 compared to a 33?

wedge_r34gtr Mentor

wedge_r34gtr

Posted
Posted

r34 gtr diff ratio = 3.545

r33 gtr diff ratio = 4.11

The r34 boxes are much stronger than the earlier gtr boxes (it was mentioned to be me when i had mine rebuilt that they can take 800+hp without modifcation) and usually cost ~$3-5k 2nd hand or ~10k brand new. Like the 33 boxes, these are also starting to get a little old and can have syncho problems if they have had an abusive life.

I'm unsure what modifications are required to make it work with the 33. Nismo make a conversion kit for the 32, which might give you an idea of which parts need changing. However, i beleive the total cost will be alot more then getting a r33 box built with stronger internals.

bigmikespec Veteran

bigmikespec

Posted
Posted

My car now has a stuffed clutch an think there has bn a stuffed synchro on fourth gear for a while so want to get them both fixed at the same time. but the car has done 150,000km an not sure if the gearbox would be worth fixing, or if i should look into putting an r34gtr box in, as they should be a lil newer and ive bn told they are a stronger box then the 33? not sure if thats true or not. currently running bout 460hp atw. But im not sure of the price of a 34 box as i havent seen any for sale, an how much itd cost to make it fit. any thoughts/advice would be appreciated. also are the diff ratio's much the same in a 34 compared to a 33?

I thought it was a good idea, I bought all the parts to do but ended up on selling it all. Changed my mind because:

- the Getrag is not as easily rebuilt compared to the simpler R32/R33

- the transfer cases are different from the more common R32/R33

- there are less aftermarket options for gearsets, etc should you need a stronger transmission

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

My car now has a stuffed clutch an think there has bn a stuffed synchro on fourth gear for a while so want to get them both fixed at the same time. but the car has done 150,000km an not sure if the gearbox would be worth fixing, or if i should look into putting an r34gtr box in, as they should be a lil newer and ive bn told they are a stronger box then the 33? not sure if thats true or not. currently running bout 460hp atw. But im not sure of the price of a 34 box as i havent seen any for sale, an how much itd cost to make it fit. any thoughts/advice would be appreciated. also are the diff ratio's much the same in a 34 compared to a 33?

460rwhp is a walk in the park for a R33 gearbox in good condition and properly driven/used.

A R34 GETRAG conversion will cost you at a minimum $7,000

2x Diffs - $1000

1x Gearbox - $3500-$5000

Labour (front diff is basically motor out) / oil / misc parts - $1200-$2,000

You can keep your factory diff ratio but that does alter the speedo massively and 1st/2nd also becomes quite short as a result, so for a daily it can be a pain.

Nee-san Grand Master

Nee-san

Posted
Posted

So what's the option for the guys in the 500+ HP bracket who don't want to spend stupid amount of money on a gearbox ?

I'm in the same boat,

Gearbox needs a rebuild,

Piggaz Grand Master

Piggaz

Posted
Posted

So what's the option for the guys in the 500+ HP bracket who don't want to spend stupid amount of money on a gearbox ?

I'm in the same boat,

Gearbox needs a rebuild,

OS Gear set. You're going to be putting new synchro's, bearings and stuff in it anyway. I got my 5 speed set with the big input shaft delivered for $2,760. You'd also be stupid not to put the billet centre plate which is another $900 or so.

It really isn't that bad especially if you take but the money you're already going to spend refreshing the box anyway.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

So what's the option for the guys in the 500+ HP bracket who don't want to spend stupid amount of money on a gearbox ?

I'm in the same boat,

Gearbox needs a rebuild,

Mine held fine @ 550-600HP, 8200rpm launches constantly for 18 months.

Might be worth the gamble just to get a 2nd hand one given they are about $800. Gearboxes failing is also dependant on the clutch. The Nismo Coppermix is very forgiving for a gearbox due to its construction and the clamp/pressure etc. Where say a nastier OS clutch isn't and will stress components a lot more.

You tend not to hear many people busting boxes that use Coppermix clutches as a result which is something a lot of people don't take into account

Piggaz Grand Master

Piggaz

Posted
Posted

It's not really 1st that breaks though Ash. It's almost always 3rd that gives up.

One thing I'd like to see is a standard box but with the billet plate put in. It might be the solution to the issue without mega expense (especially if you're getting it freshened up anyway).

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Indeed it's usually 3rd that does get stripped, it is a smaller gear etc so it makes sense.

Still clutches I think do play a solid part. I know someone that busted a OS box & a stock (without a Nismo), and then went back to a stock box with a Nismo and it was fine.

One example is far from truth but overall rarely hear a Nismo copper owner busting a box.

Nee-san Grand Master

Nee-san

Posted
Posted

Where did you get the OS gear from Paul ? I may just get a second hand box and drop it in until such time as I break it. Then rebuild with the OS gear.

Going to get my OS twin rebuilt at NPC.

Piggaz Grand Master

Piggaz

Posted
Posted

Greenline mate. Paid straight into their account and ot arrived 4 or 5 days later. Don't forget the centre plate either!!!! Gav from WA has smashed two OS sets and countless standard boxes. Funny enough, no centre plate and a JB clutch. He spoke to OS in Japan mad the first question they asked was if he had the standard plate.

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