i have a b20 1971 datsun 1000 ute. i pulled the diff out of it and the diff i had to replace it with had a different yoke? what centre will fit my ute or are there different diffs for the 1000's. my centre has a butterfly type yoke which isnt like my other centre which is more rectangle. please help
ps: im in australia

Quote:I believe that you have either,.....
1. A 1968 to 1970 Datsun 1000 ute [B20] or,...
2. A 1971 Datsun 1200 ute. [B120]
There were no Datsun 1000's in 1971. Production of the B10/20 family seems to have ended in December 1969 by all accounts.
If you post up the chassis number, or let me know by PM, we can let you know just what year model it is.

If it really is a 1000, then it came with an alloy carrier H145 differential in 4,375 to 1 ratio.
The differential from a 1000 Van or ute will fit & they should have the same ratio.
A B10 passenger model will also fit & has a 4.11 to 1 ratio.
Alternately, you can use the iron carrier diff from a 1200 passenger car model for a ratio of 3.9 to 1

As an upgrade, you can use the stronger H150 differential from any Australian 120Y [B210] or any A12 or A14 powered Sunny [B310] with the same 3.9 to 1 ratio, or from the late A15 powered Sunny Sportwagon which had a 3.7 to 1 ratio.

The H150 differential will need a 2mm soacer & a second diff gasket to work properly.
All of these will fit into your Datsun 1000 [B20] ute rear axle housing.

The H150 differentials have a larger flange & require a different tailshaft, & I suspect that this is what youare trying to fit into your ute. You should be able use the shaft from a 120Y or a Sunny. If it really is a H150 differential, then be aware that the centerline of the side gears is 2.5mm further back from the gasket face than the H145, which is why it is desirable to use the 2mm spacer & the second gasket [which is .5mm thick] otherwise your rear wheels will be pointing inwards at the front [toe in] by a tiny amount & the axle bearings will be running out of line causing accelerated wear.

how do i tell the difference between a h145 and a h150? i had noticed that the datsun1000 utes diff centre has a smaller nut holding the yoke on as the other diff i have

What did your replacement diff come from? Surely someone knows.

If this replacement diff has a larger pinion thread & a much larger yoke bolt pattern on a circular flange, then my money says it's an H150.
They are a good diff, but they need a little extra to enable them to be used in an H145 axle housing.
Extra= spacer, gaskets, & suitable tailshaft with the larger uni joint yoke.

I recently sourced a tailshaft from a Sunny wagon & measured it against my Daqtsun 1000 shaft to discover that they were exactly the same length. The only fly in the ointment could possibly be if the flange of the H150 is further forward [towards the gearbox] than the H145 which would necessitate a shortened tailshaft if the difference is significant. If it is only a poofteenth different, then there should be enough movement in the slip joint at the gearbox end to accomodate it, & the sliding yoke on the Sunny shaft, which went into a 60 series gearbox, will fit the smaller 56 series gearbox.

the yoke isnt round its rectangle and is about 10mm bigger in legth

Does this new diff actually fit into the utes rear axle housing?
I'm wondering if it's an H165 diff from the larger Datsun/Nissan models. These used a square/rectangular flange.

Generally speaking, it works like this
H145. Fits 1000 & 1200 axle housing, has small flange & small bolt pattern.
H150 Also fits 1000 & 1200 axle housing, large bolt pattern, ususlly on a round flange.
H165. Does NOT fit 1000 & 1200 axle housing, has large bolt pattern on non-round flange.

I think we need some pics now