Diffs

[malcolmpaul]

I have been after a diff for my 240Z for a while now with no luck. Someone now has a diff from a 260Z. Anyone know if this is the same ratio and fitment? Or if anyone has a good diff please please get in touch

 

[SeanDezart]

3.7 and R200 as opposed to 3.9 R180.

 

[morbias]

You will need to replace the rear diff mount with a mustache bar to fit the R200

 

[jonbills]

didn't the R200 come in with the 260z+2?
I'm sure (ish) I once looked up some pics and convinced myself my 260z has an R180.

 

[Sylv1]

if it is from a very late 260z, it could also be a R200 3.5 (3.7 usually)
You need the mustache bar and that is in as said above.

to be sure of your actual ratio, can you mesure speed thanks to a GPS when you are running the 4th at 3000? + tyre dimension, we would be able to tell you the ratio of your 240z because whatever the gearbox you have, 4th is 1:1.

For the 260, take by hand the two output shafts and let them make a few revolutions (synchronised)... and count how many revolutions make the input

If your 240 is a very early like a 1970 (see following pic), you could require the curved lower bar (seen above)

 

[jonbills]

handy Pics!.
is the direction of the scroll on the moustache bar a safe way to determine which diff one has?

 

[morbias]

I think the drive shaft couplings might also be different at the diff end on the 3.5, a single central bolt instead of four studs and nuts.

 

[Albrecht]

I think the drive shaft couplings might also be different at the diff end on the 3.5, a single central bolt instead of four studs and nuts.

Why would the drive shaft couplings be "different" depending on the ratio?

A whole range of ratios were available for EVERY type of Fuji Heavy Industries / Nissan diffs, so the ratio has nothing to do with the type or sub-variant of diff......

Someone now has a diff from a 260Z. Anyone know if this is the same ratio and fitment?

Is it hotter down south than it is in the summer?

Honestly, the term "a 260Z" means nothing. You need to know the year, the model ( two seater or 2+2, manual or auto? ), the original market and - perhaps even more importantly - whether it has ever been modified in it's 30-something year life.

More information needed then.

 

[morbias]

Why would the drive shaft couplings be "different" depending on the ratio?

A whole range of ratios were available for EVERY type of Fuji Heavy Industries / Nissan diffs, so the ratio has nothing to do with the type or sub-variant of diff......

It wouldn't. But the diff on my early 260 has the driveshafts connected with 4 studs, whereas the FSM shows the shafts on the reversed mustache bar diff connected with a single bolt.

[EDIT] or is the picture of a R180 with the mustache bar around the other way?

 

[Sylv1]

The easier way to identify is bolts around the output shafts

the R180 is above in following pic with bolts around output shafts with threads in the housing

If you see from the rear, the R200 is widder

hope that helps


Take care, some other diff are also named R200 but have "short nose" and are not direct bolt-on as "long nose R200".
Short noses are in Z31, Z32, Silvia 200SX etc... nb : Short nose are available in viscous LSD.

 

[ben240z]

Can some kind person please get me the distance from the prop flange to the centre of the driveshaft output flange from a R180 and a R200 please please please