I am looking to use a B310 (sunny) station wagon diff to my 1200 coupe. I have recently "blown" the stock diff and although i have replaced tham before myself...along with gearbox and engine......I read in the tech section here that "modifications need to be made" .......im not fussed about the width...has anyone here done this or has some knowledge on what needs to be done? any help would be greatly appreciated. Also can the b310 fornt struts be used in the coupe?

Currently my coupe has a A15 with 32/36 weber, headwork, 5 speed - on its way

the springs wont line up with the mounts

the struts will give bad camber unless you fit the bottom arm and ball joint as well

Quote:
No problem, the diff just bolts right in, but I recomend a 2mm spacer & a second gasket to space it so that the axles line up correctly.

Have a look at the ID tag on the donor B310's firewall. Towards the bottom it should have the line 'Trans.. Axle' At the end of that line it should say something like HA [or HB] with a number like 38, or 37. The 38 is for the 3.889 to 1 ratio [3.9 to 1] & the 37 is for the 3.7 to 1 ratio

Quote:

D/Man, What does the "HB" part denote?
I recently bought a 310 lower outer for my 140Y,310 coupe. The listing for all except the "HB" was the ball joint with the shorter offset. Next to "HB" it said A14, and (GX) in brackets. (In the parts book) I'm curoius about the "HB" part.


(My deepest and most sincere apologies for hijacking this thread)

You'l want to use the 1200 strut tops. And you'll have to use the 310 steering arms.

HA is Nisscode for the H150A differential & HB is for the H150B differential.

As previously writen, the number that follows is the code for the diff ratio expressed to the first decimal point, which can be a little misleading as the code '38' is for the 3.889 ratio. This is more widely known as 3.9 to 1

Thanks for your help, ill let you know how i go today, about to guve ut a go
Cheers!

Not sure what you mean about the gaskets and axles lining up, i was hoping to just bolt in the entire diff with axles, drums etc to the tailshaft. The sunny it came from has coil sprung rear end where as the 1200 has leaf.....

dodgeman was meaning just the diff centre

ah i c, ok then i should try that yeah? i gather there are no special tools required, thanks

Quote:Ohhhhh, you say 'diff' but you dont mean the diff at all, you mean the whole rear axle assembly, which is something different entirely.
The 'diff' is the bit in the middle.

The H150 diff [differential] from a Sunny [B310] will bolt into a 1200's H145 rear axle housing, but the centerline of the side gears is 2.5mm further back from the gasket face.
Some people just bolt it in anyway & go, but others will use a 2mm thick spacer ring with a second gasket, which is .5mm thick. [one on either side of the ring] The combined thickness of the spacer ring & the second gasket will push the diff forward in the rear axle housing by the right amount, or so the theory goes.

This would overcome all the problems associated with making suspension mountings, then making the handbrake work, & also avoid those irritating problems with excessive axle width.

The 1200 driveshaft will not bolt to the new pinion flange, but the Sunny driveshaft stands a good chance of being the right length, so compare, & use it if it will fit.