early 120Y's had H145's... my July'74 120Y 4 door sedan had one, but now has a BW68 in it...

Ah, how much we have learned in the past 9 years.

M suffix = Australia market, not necessarily Australia-assembled

V suffix = Panel Van
http://datsun1200.com/modules/myalbum/photo.php?lid=25699



VB310 = Van (called wagon in Australia)
WB310 = Wagon (called Sport wagon in some countries)

VB310 "Van" (Wagon)



WB310 "Wagon"



All use H150 diff. VB310 had leaf springs, while WB310 had 4-link coilover

It's a bizzarre code as it doubles up on the 'V'
The VB310 part is obvious enough, but the suffix VRM breaks down as
V= Panel van
R= 2 door
M= Australia

I had believed that B310's were imported while local production capacity was used in the manufacture of the larger P810 & P910 series of cars. Can anyone verify?

It used the H150 rear end. I don't think that the Borg Warner was seen on anything other than the locally built B210 [120Y] sedans from July 1976 untill the end of 120Y production.
The same happened with the P810. A Borg Warner rear axle was introduced in about '78 or '79, but the following model P910 Bluebird did not use it at all & it had the H165 & H190 diffs instead.

Quote:Ah, M is for Australia-assembled, right? Did it use a B/W diff or H150 diff?

My factory workshop manual shows that a leaf spring rear suspension was used under the Australian B310 van [VB310RVM], so the leaf setup wasn't completely gone just yet.

B310 wagons used coil springs all round, it's a 4-link rear suspension same as sedan and coupe.

If you have a diff already removed, then count the teeth. Just the pinion would do.
The 3.9 to 1 ratio has 35/9 ringear/ pinion teeth for an actual ratio of 3,889 to 1 but it's widely known a 3.9 t0 1.
The 3.7 to 1 diff has a tooth count of 37/10.

If NZ B310 wagons had the A12, they would have been fitted with the 3.9 diff & would have been down on performance compared to the lighter sedans & the earlier A12 powered cars which were also lighter.

I spoke to stirlingmac about the situation you speak of Chris. He adviised me that he had only seen one head which had the same measurement from the axles to the gasket flange as the H145. The rest needed the shim. He said he still has one left that he had made up.

Cheers for the info Chris, but as I didnt take out the diff myself I didnt see the ID tag. I think it was a NZ new wagon, so it probably had the A12 power plant. And it was a leaf spring wagon as all B310 wagons had leafs???....... Didnt they??

The B310 wagon was sold in Australia with the A14 engine for most of it's production run & was fitted with an H150 differential in 3.9 to 1 ratio. The sedan with it's A12 engine also had the same differential, as did the B210 [120Y] models with the Japanese diff.

The last of the B310 'Sunny Sportswagons' sold here had the A15 engine & these had an H150 differential with a 3.7 to 1 ratio.

There is some conjecture as to whether a spacer [of unconfirmed thickness] is required to install an H150 differential into an H145 rear axle housing. They both use the same diff gasket.

The Datsun 1200's that used the H145 diff came with a 3.9 to 1 ratio [in most models, some wagons seem to have been fitted with a 4.11 to 1 ratio]
For most applications, there is little to be gained by fitting a 3.9 to 1 H150 diff as a replacement for the H145 in 3.9 to 1, however, if you need a taller ratio then the 3.7 to 1 will be an advantage.
This model of wagon was not common even when new, so it might take a little bit of looking to find one. This is one of those times when patience would be a virtue.

At least one of our members has advised that he is running an H150 without a spacer in his H145 axle housing without any problems, yet Pitroad in Japan sell a spacer ring for this conversion, & it's not cheap.

Untill I get an H145 differential to measure against my H150, I am unable to say if a spacer ring is needed or not.

The picture below shows the data plate from a B310 wagon & I think that a similar tag was used all over the world.

The two lines of info that you want to see are the second from the bottom, where it says....
Engine A15[S] (carb equiped A15) & the bottom line where it says...
Trans. Axle. The code HB is the second version of the H150 differential & the number 37 says it has a 3.7 to 1 ratio
HA39, or HB39 would be H150 diffs in 3.9 to 1 ratio.
It's all too easy thanks to Feral & his boundless technical knowledge.


In the first line [Type] the code breaks down as W= wagon & P= A15 engine.
In the third line [Model] the second last character 'M' is the code for Australian models. I have no idea what the last character 'B' indicates.