Thanks ddgonzal by the way (I know a bit late)

The info did help out a bit.

I've decided to try the box that is still attached to the A15.

It should handle more torque - and if it is a 60L (which I will check this weekend), there is less gap between 3rd and 4th - which is what is really needed for the race track (for me anyway) as 4th never seemed to pull hard enough with the A12, maybe the power increase will fix that

Yep, the 60-series at least has it on the side middle like 1200rc says.

Some also have a number stamped on the top of the bellhousing flange.

Here are some photo comparisons:



5-speed comparo

usually on the side of the centre housing (drivers side) from what ive seen anyway

Quote:

thats very true, and would be the determining factor

so where is the casting number to tell which gear box is which sereis, its cold and 4 out of my 6 g/boxs are at my mates place.
are the on the top plate or somewhere else

The Pilot bearing in the Input shaft to mainshaft, and the needle bearing for the laygear. They're the two that were enlarged.
The needle bearing was the main culprit though.

I remember years ago I had a 120Y, abused it till the motor died then after I turboed it blew the gearbox. I recall only having to put new bearings and put bigger needle bearings in the input shaft or output shaft...????
I will let you know later, but hell I couldn't blow it any more. I ended up nearly putting myself in Heaven as I rolled the car at 140Km/H around a downhill corner in third.
I miss that car and damn it was stupid. But #### that gearbox was good.

Quote:Yes. The ones I've seen use the 60 or 63 series gearboxes, same as Nissan put behind the A15.

And since worked motors often have less torque in the 'normal' range of low rpm partial throttle, a stock B110 gearbox (56-series) may survive just fine behind a worked A15.

Like datsik says, it depends. But many of us have broken standard gearboxes behind A15s during normal use (no abuse).

datsik, a stock A15 (or A12) has more torque at 3000 rpm than it does at 6000 rpm.

I disagree but I may be wrong.

When doing calcs to work out if something will #### itself, one uses the torque value, the rpm and the type of engagement. For instance, if u want to know how big to make a tailshaft to survive 100NM of torque. If the raw data says u need a shaft of X strength, thats all u need if the clutch is slipped at a low RPM. If u dump the clutch from 6000 RPM u will need tailshaft with twice the strength of the first shaft.

One must also look at the tyres used. If the diff is open and the tyres spin easily.......then the spinning tyres help keep the gearbox together. If one has a locked diff with extra sticky tyres.....dropping the clutch is not recomended.

i reckon even the stock 1200 will take a fair a15 too

i have two gear boxes at home doing nothing, one out of my old race 1200 coupe.
smoothe case i think its a sunny.
full house a15 could'nt break it, must have been the good Penrite oil.
Other is standard 1200,
your welcome to make an offer if you can pick up from melbourne.