DD, Pig is pretty much onto it. There is no synchromesh mechanism, this is replaced with a 'Dog Only' setup that is rough, but very fast. A bit of a 'smash and grab' operation. THe dog also has a slight ramp on the dog engagement face, usually between 2 and 7 degrees so under load the selector ring and dog ring pull together. Synchro's generally get worked too hard and brass burns out very quick in motorsport applications.

I'm suprised that nobody has mentioned that 1st gear has 6 dogs while the rest have 8 dogs. All our early stuff has 8 dogs. The early GRA-5 (group A) and GRA-N6 (Group A Nissan 6 speed) as well as the H6S were 8 dog but later were revised to 6 dog with pretty much all the sequential box's as it offers a larger window to select gears and offers no less structural integrity to the gear itself.

So when are you making the 2.6, 1.65 1:1 and 0.65
gears for the 4sp 56a of the world :))

Holinger can make it if you are prepared to spend the cash. The reality is that nobody will spend $7K on a datsun gearbox for an A series. However I have talked to them about adapting a pintara or any 71 series box to an A series using an auto bellhousing but even then they are thin on the ground but there seems to be an abundance of 56A bell housings. So that is where my next move is. And furthermore, with the old group A stuff coming out for a dust off all the old Getrag BMW 5 speed 1:1 box's are coming out and enquiries left and right about close ratio Datsun gearsets are being talked about again. So lets just say that I am working on an affordable kit for a standard synchro 5 speed for the serious power lads. I am pretty sure I am on a winner with something that doesn't require welding. We'll see soon enough. Anyhow, thats not what this thread is about.

The bottom line is that when it comes to gearbox's, nothing is impossible, you are only going to be hindered by your wallet.

Moving on to the layshaft, Our stuff, where possible will have a full removeable spline gearset. When sixe is a restriction we will incorperate an integral gear or 2. Spacers are made and in this particular case, the gears are designed to go on one way. It is a probably one of our first mass produced kits as apposed to the generic close ratio mods we used to be most known for.




There is a flange on the front to retain the Drop Gear (or referred to as the constant mesh gear) and it will be tensioned from the rear.

will that be compatible with dogleg sss stanza boxes?

No Mik, it is a 71 series box. Not a 63 series. Completely different. Moving on...

Putting the gearset togerher to check if it is all assembled together.




Then fitting the input gear and the needle roller. Which I lube with high temp grease and plenty of oil. As this bearing doesn't always get a nice splash of oil on startup.




Then with the sandwich plate mounted in the soft jaws of the vice with the bearings installed and the retaining plate locktited into place I use the heat gun to warm the bearings up aenough to not burn them but get them hot enough to burn your fingers so that I can install both shafts at the same time without having to use a hammer of any sort.




Heres a bit of useless trivia, a Datsun 71 series box uses the same cap screw to retain the sandwich plate bearings as a Lamborghini Gallardo. True.

It is also a good time to check and make sure that all the gears allign up correctly and that none of the spline gears are in danger of running into the dog rings.

Great pics and commentary.

Interesting what you say about the Getrag boxes, I have a Getrag 262CR 1:1 box (and two boxes full of spares) that I have got for my new Sunny build.

I will be making a bellhousing out of a Dellow T50 conversion.

Interestingly they weigh the same as a T50 box.

Love threads like this! It makes me almost think that
your work and hobby are sometimes intertwined?

There are 71B "stumpy" transmissions the same length as a Datsun 1200 transmission...

D, the buisness is the result of Peters hobby, of that there is no doubt.

DD, The R30 stumpy 5 speed is a 71 series and many different ratios from Z boxs can be fitted. But there are other subtle differences as well. Technically, a CA20 pintara box is exactly the same. But it isnt.