Can someone measure the diameter of the axle tubes? That might be the easiest way to compare.

2332owner, all Japanese B122s had the H165 diff. Check your underhood plate and see if yours is a B122.

Btw, the H165 is also called by Nissan the HC41.

Okay I measured the diff and it's about 21cm from top to bottom in the middle of the pumpkin. It's got bolts holding the carrier in and a bolt holding the brake distribution block on. Here's a pic:

i thinks thats 165, looks big, my 145 has bolt hole for brake splitter on other side, just wondering if my 165 has it on same side as you and i didnt even notice??

thats exactly like my diff.... and about 21cm top to bottom aswell i measured...

rally any chance u can measure your 145?

if i have to (its not at my house)..., i did measure it once and the h145 was alot smaller you couldnt mistake it, ange your ute would definately have a 165 wouldnt it?

why do want to lock your diff?
if at present u are spinning a wheel, remember, if you stop spinning that wheel, u are putting a lot more stress through other parts in the transmission.
I recokon u are better of spinning wheels than blowing sumthin. Having traction as the weakest link is possibly the best insurance one can have.
Also have yu ever been in a car with a locked diff?

Quote:Not recommended unless you are drag racing and tow the car to races. A road car need a limited slip differential instead of a locked differential.

As datsik says, an open (regular) differential will also work ... hehe

1200rc my ute is a 76 model.... so i thought it wouldnt have a h165 like the later models?

but hopefully it is.... becuase i have 2 of them :)

In Japan the 1975 models had the H165. Oddly the catalog I have starts in 1975, so I don't know what the 1971-1974 models had.

H165's have bolts. I think 145's have studs and nuts.
Ange your ute would definately have H165!