View Full Version : Rear Diffs

16-08-2005, 09:53 PM
Can someone please explain what this diff is all about :confused:

Maybe I'm just misunderstanding it, but is it a diff from a 240 or is it just the innards from a Subaru in a 240 case?
Or is it a complete Subaru diff that fits a Zed :confused:

Link Here (http://cgi.ebay.com/ebaymotors/Datsun-510-240z-260z-280z-Rearend-R180-4-11-Gears_W0QQcmdZViewItemQQcategoryZ33731QQitemZ79926 98008QQrdZ1)


btw, what is a 510 ?

16-08-2005, 10:07 PM
I think Nissan supply Subaru with certain parts like diffs. And the 510 is just another name for the Bluebird like in the picture below.


Black Bug
16-08-2005, 10:16 PM
Subaru R180s come up fairly regularly on Ebay UK, you need to make sure though that it's not the smaller R160 though. However for your beasty you definitely want an R200 with a much taller (lower number) ratio than a 4.11:1. I'd guess 3.7:1 max. Luckily 3.7 diffs are fairly common as are the 3.5s from the 2+2. I think the Chimeara ratio is around 3.3:1. Getting an R200 with LSD is a lot trickier though unfortunately.


16-08-2005, 10:29 PM
lol when you said bluebird I was thinking of something a bit later then that, that looks more like a Fiat 131 to me :o
Can't say I've ever seen more then one of them :eek:

I had a 2+2 diff {std I bet} but left it in the car when I sold the shell, to lazy to take it out http://img.photobucket.com/albums/0703/900ss/Smilies/doh.gif
I take it a R180 and R200 are a straight swap with each other or are the shafts n mounts needed?

btw, Does the diff from a 200sx {S13 or S14} fit into a Zed?

Black Bug
16-08-2005, 10:41 PM
I had a 2+2 diff {std I bet} but left it in the car when I sold the shell, to lazy to take it out http://img.photobucket.com/albums/0703/900ss/Smilies/doh.gif
I take it a R180 and R200 are a straight swap with each other or are the shafts n mounts needed?

btw, Does the diff from a 200sx {S13 or S14} fit into a Zed?

For the R200 swap you need the R200 moustache bar, although I have heard rumours that you can turn the R180 bar around and redrill the diff mounting holes, probably work-ish! But it's a fairly straight forward swap other than that. If you're keeping the UJ half-shafts then you need the correct output shafts for the R200, course if you get one from a Z then you'd be OK. Alternatively you can swap to stronger 280ZX CV shafts (if you can get some) but you then need adapted companion flanges at the outer end, available from http://www.modernmotorsports.com

The 200SX diff swap is a lot tricker as it's a short nose version of the R200. Although the rear mount is the same, as the diff is shorter you need to fab up a completely new front mount system, and of course have a longer propshaft. I'm currently attempting it myself, although being greatly hampered by my inability to weld. I'll get there in the end.

One more semi-option is to take the viscous LSD centre from an 200SX diff and fit that into a Z R200 but you'd have to then use the CV shafts from the 200SX, modified for length, and still need to figure out how to connect them to the hubs - easy ;) - a lot of work for only a viscous LSD.


16-08-2005, 11:04 PM
Cheers Rob
As usual a very helpful answer, you've obv spent yrs studing the subject http://img.photobucket.com/albums/0703/900ss/Smilies/compute.gif, cheers http://img.photobucket.com/albums/0703/900ss/Smilies/clap.gif

I see what you mean by a 200sx diff now

Does look a bit short lol


Just found this Impreza diff fa sale n it does look mighty similar to me as a novice.


Add Here (http://cgi.ebay.co.uk/SUBARU-IMPREZA-TURBO-REAR-DIFF-ASSY_W0QQitemZ4569250859QQcategoryZ10424QQrdZ1QQcm dZViewItem)

Black Bug
16-08-2005, 11:24 PM
I think I'm about getting to grips with what a diff is now ;)

I saw that Scooby diff on ebay too, think it's a R180 but there isn't a lot of difference visually between the R180 and R160 which you obviously don't want. The chances of the seller knowing if it's a R180 or R160 is pretty slim though.

510 info and a pic of a Scooby R160, spot the difference ,cos I can't :D


16-08-2005, 11:38 PM
The only obv difference I can see atm is the output splines/flanges aren't present on that R180 diff (if that's what it is) comp with this R160 ?


16-08-2005, 11:41 PM
will a propshaft company not make up drive shafts to suit?

17-08-2005, 07:13 PM
Very impressed with the prop I had made, so if it came to it I would get recoprop to make the shafts.

Found these Zed sites earlier
Some very intersting info n pics :cool:

Link (http://zhome.com/ZCMnL/tech/R200.htm)

Link 2 (http://www.geocities.com/bry593/diffswap/diffswap.htm)

17-08-2005, 07:31 PM
btw, found this chap today in a 3.3ltr svx
Will it fit ?




17-08-2005, 08:41 PM
blimey, those diffs get every where! dunno mate. unbolt n try, but look at gearing first so not to waste your time! i think you need very low geared or engine will rev its tits off at 70!

17-08-2005, 08:52 PM
Paul reading the spec on them "early" SVX cars they were sup to be good fa 140+ :confused:
Should be good fa more then 70 mph then?
I think I need to take a closer look under me car lol :D

17-08-2005, 09:04 PM
i dont know what the svx revved at. if it was 8k for arguments sake and your motor will only rev to 5 1/2. forget torque etc. input to box( box ratio assuming the same). not my field really but a 3.5 diff r 200 sound fav..... maybe wrong their too. suck it n see or get the calculator out!:D

17-08-2005, 09:19 PM
SVX Engine Specifications:
3.3 litre 6 cylinder 24 valve DOHC Boxer engine.
230 horsepower @ 5400 rpm
Torque: 228 @ 4400 rpm

I guess 6k was it's redline but can't say I know?
17' rims might be called for on mine then if it fits lol :D

17-08-2005, 09:47 PM
i guess you will have to get on your knees to mr f. i think the calculator is his best atribute......besides the z world!:D :D :D

Black Bug
17-08-2005, 10:20 PM
Looks like you'll have to pull it and open it up to measure the crown wheel diameter. Then you'll also have to figure something out about the CV shafts and connecting them to your hub stub axles, could be tricky. I'd say shoot for a R200, with 3.7:1 being at the upper limit of where you want to be, a 3.5 probably being a better choice. Check this site out to see what sort of speeds you'll get with various gearing/wheel combos:
Obviously doesn't tell the whole story about how the car puts the power down to the tarmac but always interesting to get your max speed bragging figures in order ;)

Have you spoken with Mr. F. regarding diff ratios?


17-08-2005, 11:09 PM
News just in ;) I have it on good authority, with that SVX diff ratio/Cossie 5spd n on 70 profile 14” tyres me Zed will top out at 140+ mph @ 6k :cool:
That'll do me lol

Rob reading the links above it reads to me like the zed drive flanges pop out on some 260 diff's?
Is that right?
If that’s the case then maybe they would pop back into that SVX diff lol http://img.photobucket.com/albums/0703/900ss/Smilies/pray.gif
MrF?, Before I diff-er about to much I want to get it running :D

Black Bug
18-08-2005, 12:14 AM
I don't know if the flanges pop out on the R180, they do on the R200 but alas they wouldn't fit into the R180 as the R200 is wider so the shafts are longer.

If you really want to try that scooby diff then I'd suggest looking at modding the CV shafts on it so that it can be hooked up to the Z stub axle companion flanges. You'd also have to check the pinion flange had the same bolt pattern as your new propshaft, you should be able to swap the pinion flange from your Z R180 though on to it. Def starts to get complicated ;)

You're right though to get the darn motor running first, sod it if it blows up the diff you've got in place :D


18-08-2005, 11:57 PM
Anyone got a pic of the 260z "Automatic" diff or shafts ?

datsun dave
19-08-2005, 12:20 AM
Have just bought a R180 LSD out of a Subaru (very cheep off ebay) and have from years ago a new pair of 280zx drive shafts the drive shafts go in the diff as if i had them made for the job had the car up at mark warbys a few weeks ago the diff looks to be the same size/shape & fittings will be doing the conversion in a few months so will let you all know the results.

19-08-2005, 07:43 PM
Interesting read I just found .... I assume it's right ?

Nissan owns part of Subaru, which is actually a division of Fuji Heavy Industries, which uses (like Nissan) Hitachi R-160 diffs for some of their cars. How do they fit? The Subaru diffs (both LSD and non-LSD) bolt in just like the stock R-160 Above is referring to a 510 tho :unsure:

So if a std 240z uses an R180 diff then hopefully a 3.5 R180 LSD from an Impresser will fit straight in a 240? (If the 240 drive flanges pop out and fit the Subaru diff ok?)

and found on another site ...

R160, R180 and R190
These were IRS (Independent Rear Suspension) differentials with long snouts. The "R" stands for Fuji Heavy Industries. Well I neva :D

21-08-2005, 09:31 PM
the lsd in my mk2 supra is a fuji lsd, i must have a good look at it....

21-08-2005, 10:25 PM
I did take a look at a 90 turbo Supra diff, but it's nowt like an early Zed diff.

21-08-2005, 10:29 PM
this is a 84 2.8 supra.... i'll check tomorrow nite

26-08-2005, 08:07 PM
Anyone got any pics of a Z31T diff? Will it fit into a 240?
Is it the same ext as the 260 R200?

26-08-2005, 10:24 PM
Forgot, but along the same lines :)

As I haven’t actually seen any for sale over here that is
What are lsd diffs making over here, good used 2nd hand?

Say a …

240 R180

260 R200

280 ???

Z31 R200 ?

Viscous or plated whatever they may be as std ?

Also the range, + or – dep on ratio ?

ish, I won't hold you to it :D

27-08-2005, 06:06 PM
Has anyone any info on Z31 rear diffs?
I've just been to look at a Z31 in a breakers yard, G plate, 3.0 manual, na non turbo! I read and therefore assumed if it has a finned rear cover it will have an lsd? Yet it was easy to turn one shaft without the other moving? I take it that isn't a lsd then :confused:
Either that or it's fooked :unsure:

btw, whilst I was there I did spot a 88 2.4 laurel injection :eek:
Looks just like it has a long nose diff, the same as a zed but uses push in shafts like the Z31 :eek:
Diffs any good in them ? :D

27-08-2005, 06:24 PM
Luckily 3.7 diffs are fairly common as are the 3.5s from the 2+2.
My Haynes book of ***** says the 2+2's had / have 3:7:1 diffs...