there's a 4.3 ratio available in Corolla BorgWarner diffs (3.9, 4.1 and 4.3 ratios). That's what I use in my coupe, so there's no problem with their strength. The whole housing is basically a bolt-in fit to the 1200, using the 120Y BorgWarner diff flange and tailshaft. They are a bit wider track too, but if you don't want that, you could look at fitting the Corolla centre to a 120Y BorgWarner housing which is the same width as the 1200's. You can also get bigger drums with the Corolla diffs which make a noticeable difference if you still use the 1200 drums on the rear. Some Corollas have a small rear swaybar which might also be useful for you.

This is definitely the cheapest and easiest way to get a 4.3 ratio for the 1200. I payed $50 for the 4.1 diff complete drum to drum, and $70 for the 4.3 drum to drum.

I think it came from an A15 one, I guess I gotta go check the ratio.

is that the c20 van with the a12 or the a15.the a12 c120 van came with a h165 of 4.888:1 ratio,& i don't think i've ever seen an
auto one.the only 4.6:1 h165 i know of was imported from japan for a sunny racecar.the a15 powered c122 has a 4.6:1 h190 diff.this
will not fit the 1200 ute diff,but the complete
housing could be used if you're willing to run the correct offset rear wheels.or if you can find
a 620 ute rear end,it's the same width as a 1200,but is a 4.6:1 h190 alloy centre,with big axles.it comes with 6 stud axles,however.

Automatic C20 van has approx 4.6:1 ratio with the same spline as the ute, the axles are longer though

Do a search for a Mitsibishi Starion diff conversion. I haven't done one myself, but I'm pretty sure there is helpfull heaps of info on this site. You would probably end up with disk rear-end too!!

There are heaps of mitsuishi ratios. L300, Pajero, Starion etc. I'm sure one of them is 4.6:1

The Pajero diff might even have a lsd option.

Let us know what you find in your research!!

Looking for a Datsun 1200 ute diff centre and axles.
We currently have a 4.11 and are looking for ratios round 4.3 to 4.6
Any hints as to what vehicle came with these ratios and where to find them these days?
Adam @ BDA