Hi Guys

I have question and hope some one can help me out, my diff pinion ripped some teeth off today, rather then get a replacement pinion and save myself alot of time and $ im going to buy a new centre!! as far as im aware my diff is origanal just with the rally 4:1 ratio, i dnt need another centre with the same ratio i just need one thats goin to fit into my housing. How can i tell wat my diff is out of and where abouts to i measure from?? ? ? ?

Cheers Logan

This article here offers some excellent information to get you started.

Diff article

Then when your all up with H145 this and H165 that...and H190.err well you get the idea.

If that don't help I'm sure we can take it from there.

Don't know what car you have.

If the centre is held in with bolts, it's an H165 1200 Ute Diff. Can be replaced with Bluebird centre or another 1200 Ute centre.
If the centre is held in with nuts, with studs coming out of the diff housing, then it's an H145, which is one of the most common diffs of all.

If it's got a plate on the back, it's a 120Y borgwarner.

As the H145, H165 are a contained carrier, there is no measurement required, just pull the axles, replace the centre, and reinstall the axles.

My centre is held in with bolts on the tailshaft side which therefore makes it a h165 1200 ute diff Correct?

Are you able to take a digital picture of it and post it? (that would speed up the process a bit)

Sorry mate i pulled it apart at work!! il try find a pic on the net of it!!

[img]http://datsun1200.com/modules/myalbum/photo.php?lid=3338[/img]

Quote:With a Nickname of 'My74Coupe' it sounds like your car is a B210 [120Y] That would mean that it had an H150 diff from new. Herein lies the problem.
The H150 was not available in a 4.11 to 1 ratio, but the 4.11 from a 1000 will bolt into the housing, however, this is an H145 differential. A quick check is possible by looking to see if the differential carrier is made from aluminium [Datsun 1000-H145- poss 4.11 to 1] or iron [Datsun 1200-H145 or Datsun 120Y-H150 in 3.9 to 1]

Some will remember that the H150 has a 2.5mm greater distance from the gasket face to the axle centerline, & when this differential is used in the H145 axle housing, a spacer ring is recomended to space the diff foward a whisker to correct this misalignment.

Using an H145 diff in the H150 housing will have the axle centerline just a little bit foward of the centerline of the axle housing. Short of machining 2.5mm from the differential gasket face, I don't know of any other method of addressing this problem.

Is it really a problem?
I can't say for sure, but in theory at least, it would give the rear wheels just a tiny bit of toe out, & impose a small asymetrical load on the axle bearings.

Counting the number of bolts/ nuts that hold the center into the axle housing will be a great start towards identifying this diff.
I seem to remember that the H145/150 diffs had eight bolts, while H165's had ten. Can anyone confirm?

Is this the diff that is actually in your car, or is it a 'file photo'?

the project car tucked away in the corner of my shed is my coupe!! my daily is driver is a 1985 datsun 1200 ute! no that picture is off of this site but my diff and that picture are identical, with out the oil leak ha ha!!
thanks for ya help but i just got my hands on a new ccentre from my oldies so its all good now!!
thanks logan

Quote: Then the differential is the H165 type & the 4.11 to 1 ratio is standard, not rally. This diff & ratio ratio was also used in the 510, 710 & 810 wagons