Hi all, how are you?, i am doing a 1nzfe swap into a datsun 1200 coupe, going to keep it as light weight as possible, dont need much power, i will be posting pics soon... can the stock h145 diff handle the torque??

nope- the h145 will break if you sneeze at it

It will break if you just look at it.

Toyota 1NZFE only has 80kw - its only going to be about 80bhp at the wheels. And its not a torquey motor, with peak torque up at 4200rpm. H145 should handle that OK IMO. Plenty of worked A series make that power and similar torque and the stock diff holds up OK.

Yota 1NZ-FE engine has 103 ft. lb. of torque. More than an A15 -- which will sooner or later break the H145. Especially if a steep 1st gear transmission is used. Some have reported the H145 lasting for a while behind an A15, but it is not rated for long-term durability. TS-Cup racers used H145 but had to be very gentle and they still broke sometimes. They also used diff coolers.

Remember, the higher the engine revs to make peak HP, the lower the torque will be. HP and FT-LB figures cross at 5250 RPM. For example, a 100hp@7000 RPM engine vs 100hp@6000 RPM -- the slower engine will have more torque. And torque is what breaks gearboxes and diffs.

I've got a H145 in my coupe behind an A15 (until I get round to swapping it). It hasn't broken yet although I don't drive it much. If you're kind to it it should last.

That said, if you need a custom tail shaft you may as well get the H165 up front and get the tail shaft made for that.

If you're kind to it it MAY last. I broke two H145 with a stock 80hp A15 within a year -- driving it gently. The 65hp A15 may have less torque.

Maybe I've been lucky? It does whine. Not quite enough to motivate me to swap it over yet though.

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that's why I mentioned it only makes a peak torque at 4200rpm. Showing its an engine that needs revs to make anything happen, not a torquey motor.

1NZ-FE makes 107bhp @ 6000rpm and 103ft/lb @4200rpm. Its not all that much really.
B310 A15 makes 83bhp @ 6000rpm and 88.3ft/lb at 3600rpm.
910 SII Bluebird L20B makes 96bhp and 114ft/lb for comparison.

Maybe the H145 will be borderline, but no more so than a 80rwbhp Aseries. I've had one and never had diff problems. Hell, I've turbo'd A14s in front of H145s and not blown up the diff - just gearboxes, tailshafts and pistons! I don't think the concern about the diff is worth stopping the conversion. Try it and see how it goes. Or track down a B210 H150 for a little more strength, assuming they're available where you are.

Thank you all for your kind replies and suggestions, its actually cheaper here were i live to replace 10 h145 diffs at the cost of 1 lsd hilux diff, what if i weld the h145??? :D