Datsun SG 720 Diff Ratio

[Chris A12ET]

HI all im wanting to know if any one has had any experiences with changing gearboxes or diff heads on a 720 ute at all.
Im wanting to keep it colum change with the Sd22 diesel, Do later model 5speed colum gearboxes from the Navara fit up to the SD22 ?
or slightly higher ratio diff heads ? As it is screaming at 90-100 kms Cheers for any info.

[classicdat]

I think the very first of the Navaras ran an SD23, but I am unsure if they had 5 speed or not.
Generally 4 and 5 speed boxes come in series, so it will just be a matter of finding a 5 speed of the same series(size) in column change and swap the front, (Bell housing front half).

[Chris A12ET]

Cool thanks for the pointer must crawl under the Ute and have a look for some numbers.

[fletch]

have you got 4 or 5 speed now?

also, long or short tail housing? ill find you some photos tomorrow of what to look for.
If you already have a 5 speed, then you will need to change the diff, or maybe find a gearset from a late 280zx with the 0.75 overdrive top gear.

[rob.121]

My 85' 720 (L18 powered) was 5 speed and sat at approx 2500rpm at 100kph. not sure if that was due to the 5 speed or diff ratio but i suspect both. so possibly a diff from a king cab 5speed could be a better ratio? just an idea.