So a long time since ive been on the Forum but my old man
has bought a 67 Bluebird 411 with a 4 speed and 4.1 diff gears. He asked my if the diff is the same as any other Datsuns
with a longer ratio so it cruises a bit easier on the highway as its revving hard (according to him)
So does anyone know of any options??

Heres the machine...

H-190?

Are you saying that center may bolt in or do a conversion Drum to Drum?

The 410 and SP310 (ie 1500 Fairlady) have many diff parts that have the same part number, so I would assume they are basically the same diff (H190).

Assuming the 410 and 411 have the same diff (I only have the 410 parts manual so can't be sure), you may be able to swap in the crownwheel and pinion from other H190's (fairlady, 1600 wagon for a start).

I don't guarantee this, but its probably a good starting point.

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1970 ex Group A Rally P510
1971 P510
1972 180B SSS
1965 SP310 Fairlady
1966 SP311 Fairlady

Excellent advice thank you.

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I have both a 3.7 and a 3.9 either whole centres or just CW&P's H190

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Yep, i race a Datsun, and I drive a truck, sometimes I get confused, and then the truck goes fast, and the Datsun gets a lot of boxes shoved into it. AWW GEE

If an H-190 then the center can just be swapped and no need to remove and disturb the gear lash. Having said this, cars tend to have 23 spline side gears, trucks are 29. You can carefully mark the bearing locations and dismantle the H-190 enough to swap just the side gears.


320 H-190 13 splines side gears. (may use non metric fasteners)


510 and Roadster H-190 23 spline side gears


520/521/620/720 truck H-190 with 29 spline side gears


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my favorite datsun colour of all, peppermint cream