Feral
Yes it helps a lot & i thank you once again, but,...ummm,...errrrr, whats the diference between the H150 & the H150A?

It is usually some product difference. For example, the entire third-member "H150" interchanges with third-member "H150A", but the ring & pinion from "H150" may not fit a "H150A" carrier.

I think I forgot to tell anyone or never made a point of it so here goes. It doesnt provide the freeway ratio of 3.7 but it might help anyone else for an alternative for a 1K beef up.

I found a 1967 bluebird sedan and the diff came off quickly after I found that all the brackets are exactly the same as my 1000s. You might think so what but the bluebird had a H165 diff centre with alloy carrier and bigger drums and the best of all the exact same width as the 1000. So if you see one at the wreckers save the diff itll be a sadly lost item for a 1000 if you ever get one.

Ive been told that the alloy finned drums from the 240-260z are the perfect replacement for the cast iron ones.
The only thing is that I dont know if the axles would interchange, if its metric or imperial or anything else really.

Thats my 2 bob worth anyway as these diffs sat behind an L series type engine in the SSS version with 1.6 litre capacity and one tonne dry.

interesting. do you know what ratio?

D
Are you saying that this Bluebird rear axle assembly has the same width, drum to drum, as the 1000, or are you measuring the spring pads only?

Did you salvage the whole rear axle assembly, or just the third member? The chance of using finned alloy drums is yet another bonus.

The ratio doesn't matter too much as there are other H165 diff centers, although the alloy center is a bonus in keeping the weight down a bit. The original 1000 center is alloy also.

4.11 on the sedans and 4.44 on the wagons. Ill take a picture of it after Xmas and we can compare them. But yes the width with drums is the same and the leaf points and other connecting points are the same with recent measures even the handbrake stuff is on the right spot.
Stevos 1000 looks like the diff with alloy finned drums but Im not sure if its the same setup. It would be good if it is and if not well I hope Ive stumbled into a good thing for us 1K lovers.

Difference between 150 and 150A is pinion configuration in relation to the crown wheel. Both are hyoid but the 150A has the pinion mounted lower for greater tooth contact area???

Feral
Again, thanks for the info. It would seem that, given the choice, the H150A is the way to go as it looks like the greater contact area equates to a stronger gearset as you say, & the lower pinion position would allow fewer problems in a low car. Thats gotta be good for some.
Chris

where does the rare sialsbury desgin diff come into this equation? i picked up a borg warner off a '71 datsun 1200 apparently, but i belive it may have been changed at some point, the shafts are much thicker than my h165 on the ute presently.

Unfamilia
Are you sure you are not looking at the Borg Warner rear axle assembly that was used in Australian production 120Y's from about '76? These had a diff ratio of 3.889 to 1 from memory.