the definitive GTR transmission thread.

[gtrjon]

basically from what ive read and seen these are my conclusions: if you can afford it either go with the os88 or a hollinger box and be happy for the rest of your life. the next best option would be either a ppg or par set and finally most affordable but not necessarly bullet proof would be a osg gear set either the 1-3 or the 1-5

[collector240sx]

hey guys, can someone tell me why so many people seam to think that the Getrag are weak ?

I might not post too often, but I can assure you that few member will have done close to the research I have done. And through out the years I have seen many build of 800HP-900HP on stock Getrag hold up just find. The problem that keeps popping up with them, is that they don't like to be banged through the gears, or you'll go trough synchros pretty quick. The weak synchros on the R34 is not something new either, I can even remember reading something from Tyndago, must of been like 8 years ago, where he said that supposedly the issue was aggravated by heavy clutch and that was why he had a carbon clutch. Now I'll admit the synchros are part of the trans, but if you can do the jobs yourself it's far from the most expensive thing that can brake on these cars.

Has anyone here ever even seen a Getrag that stripped a gear or any major failure, that wasn't 1000whp+ on slick , anything crazy for fuel, or on a full prep drag strip ? If you did please post pics, I'd really like to see them.

It's not the power that kills the trans., most of the time it's the traction. That's why the Getrag in the Supra is capable of so much more power to the wheel then the R34 one, even tho they are so similar. It's simply because being all wheel drive the R34 has a lot more traction, and flex in the drive line (example: stress on the transfer case) can also contribute to breakage.

If you want to know the gear ration for OSG, HKS, quaife, etc... follow this link.
If you want to find some pages full of really good info, again go on this site.

http://sites.google.com/site/tyndago/gt-rtransmissions

P.S. I love the Idea of the using the T56 (similar TR6060, TKO 600), would be easier to source parts or whole trans. that would be sure. Price for them is actually pretty good. Still wonder how they would fair in a AWD application.

[LuckyGTR]

getrag are weeks?

http://www.youtube.com/watch?v=fpBJCHNdEBA

9 seec GTR on stock GETRAG 6 speed !!!

tx

[cortexx]

Im pretty sure you can break anything if you are determined enough and im also pretty sure that most GTR's will do great on a road track and street with a an OSG gearset.

I don't think there is a AWD car in the world that has a manual transmission that will hold up against constant sidestepping the clutch at redline . The shock through the whole drivetrain is absolutely astronomical . It's hard enough on RWD , hideous for AWD.

At the end of the day these cars are really designed for road course / race circuit tracks , once rolling it's usually a bad shift that messes things up, a competant driver will lap after lap without destroying a tranny.

Drag racing an AWD unit is a ticking time bomb , it was the achillies heel of the 3000gt platform , and although the GTR has a much stronger setup , it's still the achillies heel .

The question is - do you really want to consistently subject your investment to that kind of punishment ?

[Dragon Humper]

Drag racing an AWD unit is a ticking time bomb , it was the achillies heel of the 3000gt platform , and although the GTR has a much stronger setup , it's still the achillies heel .

The question is - do you really want to consistently subject your investment to that kind of punishment ?

LOL....every time I drive it man.......... everytime.

Just look at my tranny, I am a true testement to what stock hardware can put up with if you always keep in mind that you are playing with a hand grenade. The stock Getrags can put up with alot too but I have yet to see one in a big powered car still running the 3:42 gears, usually they are the R32 4:10s or the GTS4 4:36s. That alone gives you a fair sized fudge factor to keep the box in one piece.

Not wanting to shift like you stole it is the biggest reason I won't go Getrag, I'm grannying it now, don't feel like going through a whole lot of BS to do the same thing. It would most likely stand up to 7000rpm drops with 4 Drag Radials and the R32 4:10s but timidly shifting will cost me precious tenths to bang off that 9 sec pass I want under my belt.

I think an OS88 is in my future.


Jon.

[gtrjon]

i agree with Jon. when we say the getrag is weak i personally mean it is weak in comparison to the other gear sets being discussed such as ppg, osg, hollinger, and the os88. We are simply looking for a tranny that can take a beating. yes a getrag can do a 9 second pass but its not a matter of being able to do 1 pass its a matter of how many passes it can take. just like jon said i think the os88 is the way to go.

[Black BNR32]

My goal is to run 10s on a stocker, even if it takes breaking a couple. Faster than that, choose another platform.

[Terrh]

didn't see your posts!

I haven't been on the forum much lately - too busy with school or working on my GTR.

Anyways the viper trans option is still out there. Buying a house stopped me from buying one. They make a bellhousing that will make it attach to the engine and can work with any clutch. They make custom input shafts so I'm sure they can make it mate to anything.

As far as strength goes - Camaro t56's are **** stock, but they're easy (cheap!) to upgrade and there are guys running 2000+whp through them. The viper ones are better. Corvette ones are similar to camaro ones except the case is completely different, and it costs about $1000 to make it be a camaro one. The important part is that they're ALL upgradable.

The viper trans is ideal because it has a remote mount shifter like in our cars, so it can be adapted to the transfer case much easier.


Recently I've been considering just getting a stock R32/R33 box upgraded with better gears. I have never had shifting issues aside from some noise at high RPM (8000+) shifts. My current trans is already making horrible noises and I haven't even done anything to the car yet! So I'm not expecting it to live a long life. I have a few spares though, hopefully enough to last the summer.

The clutch I have (ORC triple) is extremely harsh and even trying to be gentle is difficult.

oh and reply tot he above post: 10's on a stocker should be easy as pie. I'm sure people have gone 9's on one. My car might if I don't get kicked out first.

[LuckyGTR]

the day i have 1500 hp , IL have a ******* 8 sec alpla 12 R35 !!!

for a R32 wit a R34 tranny it will do 10 sec pass all day long all the tranny life if the driver is good , iam good !


my goal wit my r32= 600 whp n alot of fun all around .... GETRAG will hold it no problem thats wat i was trying to proove


on the other side if u guyz want 1000hp reliable tranny then u guyz MENTIONED are true and will be more reliable then my getrag at that HP number ,,, but meh guyz who has 20 k to bang on a tranny setup?

my 7000-7500 tranny setup IS not expensive for wat i get ,,,, 20 k for ultimate tranny that u rebuild every 5000 km ,,,, i dunno.... im too poor for that !!! and i wont have 1000hp in my r32 ! thats 100% sure ,,,

[cortexx]

The day you have a 1500hp skyline you'll probably kill yourself - 600hp is violent enough , 1500hp especially on the road is unrealistic to drive safely . There comes a point where making more power is counterproductive to performance , at 600hp the most important upgrade for most drivers would be driving skill ! .

Im hoping for around 600hp out of my new engine when it's done and tuned at which point I fully intend to complete the BMW trillium road course training and then the advanced course . I'm not inexperienced by any means but one can always better ones self

[Dragon Humper]

,,, but meh guyz who has 20 k to bang on a tranny setup?

my 7000-7500 tranny setup IS not expensive for wat i get ,,,, 20 k for ultimate tranny that u rebuild every 5000 km ,,,, i dunno.... im too poor for that !!! and i wont have 1000hp in my r32 ! thats 100% sure ,,,

They ain't that much (unless you want Hollenger). You don't need all of the extra crap to go with an OS88 unless you really think you need it and as far as the clutch, in my case, I already have an R4C sitting on the shelf ready to go. So for me I can wangle a deal for about $12,000 at SEMA (from what I understand) and I'm laughing.

You don't need to rebuild that tranny every 5000km, they only recomend that you inspect/refresh it. If you aren't racing I think that every 20,000km would be fine, and even then you are only pulling it apart and inspecting.

Another thing to remember too is that not only are you getting one of the toughest sequentials out there but you are also getting a brand new enhanced transfer case as well with extra, upgraded clutches and steels. Which might be detrimental to the front diff.....lol, it never ends.



Jon.

[Dragon Humper]

.

The viper trans is ideal because it has a remote mount shifter like in our cars, so it can be adapted to the transfer case much easier.

That's what I was wondering about. The only other thing is what would 5th and 6th be like? If 5th was changed to a .87 and 6th was .75 then that would be OK, steeper than that and 6th will be usefull for only highway cruising on flat ground, unless you changed the final gearing to 4:36.



Jon.

[Terrh]

The guys at liberty can do custom gearing. I am pretty sure there are ratio options that are better than the .5:1 they come with.

[tryingtobebest]

Hey guys, lots of discussion about transmission but what about most painfull part - front diff; and the rest of the "FWD" system, in the area of 600WHP what is everyone using for a front diff?? I called it paintfull because if you brake diff you most likely need to take the engine out... IDEAS?
How much can Front axles handle? and how much for the front driveshaft???

[gtrjon]

Diffs from what ive seen can handle a beating. front pass axle not so much ive seen quite a few break since its the long one. I recently broke one at the drag strip at 5xxawhp