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240260280z

Interesting Differential.... R190?

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4.44 gears were available as a ring and pinion for the R180 from Nissan Comp for years. Very common racing install for the 510 guys here in the US. The R190 4.44 was installed by Nissan in a couple cars in Japan with a two pinion CLSD. It might have also been installed in Australian and European vehicles. Its sometimes referred to as the R192. I had one and spent silly amounts of money replacing one pinion bearing. That bearing is NLA now in the US and Japan. I eventually sold the diff to Ron Carter.

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It could be an R-190, they are typically 4:44 gearsets, but without a photo of the unit it is impossible to say. I did buy John's R-190 3:90, as well as several other R-190's for my Z and 510.

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I agree, without a photo impossible to tell if the diff is an R-180 or an R-190. However, I've been told by several early Z racers that the R-190 was a diff that was brought in by Datsun comp for only a few cars so not that many were available. Therefore, I doubt it is an R-190 and more likely an R-180. I would love to know what other Datsun Comp parts are on the car??

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It could be an R-190, they are typically 4:44 gearsets, but without a photo of the unit it is impossible to say. I did buy John's R-190 3:90, as well as several other R-190's for my Z and 510.

Ron - did you say "several"? PM me if you need to sell one of the R-190's.

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Just called the seller:

Nismo R180

E88 head with mild cam

Cannon headers

Nismo sway bars

SU Carbs

Oil rings shot(burns oil/smokes), paint faded, dash cracked, rusted rails, ziebarted so unknown underneath, front damaged from towing and from an accident on the track, carbs and fuel lines need attention.

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Hi Mitchell,

With a 510 and a 240Z race car I need several different gearsets depending on the track we run, so yeah I have a collection of LSD's. Because of issues with parts, the R-190's have been pretty reasonable price wise. I am not looking to sell any of them at this time, If I change my mind I will let you know.

Ron

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Let me know as well if you want to sell more than 1. I'm looking for a new or properly rebulit one, in the $2000 range I would imagine. Any leads would be appreciated!

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I too have a few of the R-190's (and Ron has one of mine as well ;) I may be willing to part with one.....what ratio is needed?

BTW, $5000 seems a bit high for a car that needs major chassis repair and a has a few "motorsport" parts??

Also...never heard of a Cannon header....thought it might be a cannon intake but the saw the car had SU's so not sure....

Edited by vintagezracer

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Great to hear it is working good!

I had to go through my inventory of diffs recently as we finished the re-restoration of the race car in time for the US Vintage Grand Prix at Watkins Glen and needed to put some spares together.

It has been a few years since I sold that diff to you....remind me was't the diff a LSD?

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I myself need a 4.44:1. A previous owner of my Z432 had changed out the 71A and r192 for a B box and R200. Works great, but I'd like to return the car to stock by next ZCON (which gives me 12 short months). By a minor miracle I found a proper bell housing, so now I'm seeking the other stuff.

When I saw this craigslist ad I thought my prayers had been answered, but car has an r180 and 280z gearbox.

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Hi Tom, as far as I am aware all R-190's came standard as LSD differentials, although I know you mentioned you had a locker in one as well....The 4:44 that I got from you has been in my car since I finished the restoration on my car.

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For a street car the 4:44 would not be an ideal gearset. I would suggest that you look for a 3.9, yes that will be harder to find but more driveable for your Z432.

What gear ratios are you talking about with a 71A box?

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For a street car the 4:44 would not be an ideal gearset. I would suggest that you look for a 3.9, yes that will be harder to find but more driveable for your Z432.

Ron,

I disagree. The 4.44 ratio was stock equipment on the PGC10, KPGC10 and KPGC110 Skyline GT-Rs, and on the PS30 Fairlady Z432 and PS30-SB Fairlady Z432-R. The S20 engine is very happy to rev.

Alan T.

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With Alan on this one - I've driven a stock 432 setup and it works quite well. The setup I have now works fine, too, but it's just not correct for the car. Checking into correct 5-speed ratios - I'm sure Alan knows it of the top of his head, but I'm just learning ;).

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Checking into correct 5-speed ratios - I'm sure Alan knows it of the top of his head, but I'm just learning ;).

Nah, I'm too old. Need to get the literature out to be sure.

FS5C71-A trans ratios as used in PS30 Fairlady Z432 were same as the 5-speed equipped 'SR311' & 'SRL311' roadsters, and therefore give you the option of sourcing a 'Roadster' A-type 5-speed in the States and simply swapping the bellhousing for your S20 version:

2.957 / 1.858 / 1.311 / 1.000 / 0.852 ( R 2.922 )

As mentioned before, I have some used FS5C71-As on the shelf, but shipping would be $$$ and they'd need checking / rebuilding anyway. Probably best to leave as a last resort?

Alan T.

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