I got a technical email today. It read
"Well it finally happened..... 3rd let go in my stock box today. Its behind a 2.8 with twin RS's... I know 3rd is the weakest link and I am always a pansy shifting into 3rd.Third gear is a weak link in the Nissan gearboxes. Its at the center of the stack, and we think the gears walk a little bit outward on each other and then shear all the teeth off. There is also a mismatch in the stack of gears. In the following picture of the OS Giken gearset, you can see the gears don't mesh up 100%. In the above picture is an early and late R32/R33 gearbox. Some people try and say the later boxes are stronger, theres a picture of two broken gearsets.
What are my options here? What would you recommend? OS gearset? Im no too keen on the 5th gear being shorter then stock....
It is a road car so im not interested in straight cut noisy gears."
So what are the options ?
An OS Giken Gearset is an option.
|OS Giken Gearset|
The OS Giken gearset is stronger. Good for about 700 hp. Not unbreakable. It can and will break. The 1st gear is longer, 2nd, 3rd , and 4th closer together. You will hear this transmission called a "crossmission". It actually should be called a "closemission" or "crosemission" . Japanese and their R's and L's , B's and V's. Just a pronunciation error. There is an optional 5th gear, but you can run the standard 5th gear. The OS gearset is helical cut gears with synchros . It drives and feels like the stock gearbox.
The R34 GT-R Getrag is always an option. They are the same/similar V160 that is in a Toyota Supra. The Supra guys have pretty good luck with them. In GT-R's we tend to break synchro sprags, and that type of thing. The Getrag is a good box, 6 speed. A little noisy. Sounds like a box of rocks at idle. You need a new transfercase as the Getrag uses a unique bolt pattern on the transfer end. You also need a new clutch, or actually a new flywheel as the height is different. New main driveshaft or section, new propshaft. Couple other minor things. The Getrag was setup for 3.54 main gears , so the stock R32/R33 4.111's might be a bit steep. You have an extra gear though, so its not too bad.
|Getrag V160 internals|
My suggestions for most cars is to try out an OS gearset ,
Redline Shockproof Heavy(not in the Getrag) , a twin plate sprung hub clutch, and shift easy into 3rd.