A part I've never seen before, Greddy Differential Cover......
 

Interesting, never come across this before...it's listed on their website. Is anyone running this?

GReddy precision cast aluminum Differential Covers prolong the life of your limited-slip differential, by increasing oil capacity and cooling. Internal baffles control oil slosh, while an integrated 3/8PT port can be used for external cooler for extreme usage.

Application:

S14 / S15 Model with R200 Differential

Skyline GTR R32 / R33 / R34 with R200 Differential

FD3S RX7

You havent seen that part before? I've seen them, maybe just because I live in Japan. Dont know of anyone that has one installed though

Cool, That's something to look into!

I wonder if the case is alot stronger then the OEM rear casing...

Jay7...

Nice find :bigthumb:

looks like what BMW ( or was it Alpina and aftermarket places ) used to do with their rear diffs and sometimes oil pans. The fins in the aluminum help in cooling.

Air cooled VW's run cooling fins, but there would be about three times as many. Also did they say how much it costs? It might be nice to have. Plus it looks good.

http://www.trust-power.com/05engine/diff_cover.html

It's 33,075 yen which is roughly $274.82 at the current yen rate of 120/$

I could get these shipped to you guys for $320

I don't see why it would matter much - the other half of the housing holds all the bearings and take all the loads.

Dave

It pretty much just holds a bit more fluid for better cooling and lubrication, it won't make you diff any stronger.

Personally I'd slap a thermal sticker to me diff first and see how hot it gets. The stock diff is heavy enough to begin with. No point making it heavier and adding oil if you don't need it.

Dave

I like the ports for a cooler. I dont know if anyone would every need it, but it sure has a gee wizz appeal to it.

A lot of skylines run these with an external cooler because of there 4 wheel drive and active traction control

How could you run an external cooler without pressure from a pump?

they run a inline pump out the bottom hole into a cooler and then back in the top hole. I have even seen them have electric fans on the cooler. It looks pretty bad ass on the R34 gtr nissmo Zspec. Ill see if I can find a pic.

Here you go. You can see the coolers under the rear bumper.
http://i21.photobucket.com/albums/b2...385_3_full.jpg

If you want to see mor epics of this car go here.
http://www.cardomain.com/ride/2107013

i think those are the fill and drain holes, not ports for an external cooler.


if they're for external coolers, where are the fill and drain holes? maybe i'm missing something

^ good one :)

Aware of the Greddy cover for a while now. Rich, I believe RHDJapan.com sells these.

+1. I've run my car up on the lift in July after some long drives but never noticed the diff cover more than just warm. A decent synthetic probably helps too. Of course it could be a different store for a tracked car.

At any rate, they've been listing them elsewhere lately too.
http://cgi.ebay.com/ebaymotors/Gredd...QQcmdZViewItem

Those diff covers aren't too hard to find in the US. If nothing else, it's something else you can polish up on the car :).

I know Nissan guys frequently run diff coolers, both Skyline and S-chassis cars. Small electric pump to cycle the gear oil through the cooler. I want to say some Nissan car came with a diff cooler stock as well.

This is one of those parts that's neat, but I'd have to know that I needed it before I'd spend the money. If you could find out that the gear oil in the diff is getting too hot, sure. I think you could really only get it that hot from serious track use or drifting. REALLY not needed on the street.

Dale

Jim, you find all kinds of odd ball stuff. Next time I need a part, I'm coming to you!




Also, if you follow the link to the japanese website above, you can clearly see the two cooling line bungs and the drain plug for those doubting they were built to run with a cooler.

anybody know anything else about this? ^^

Good find Rich, anybody actually use this yet? And what, if any are the benefits? I can't see our diff getting that hot.

I've seen it on eBay for a few weeks now.

Dave

Yes, and if you read the description on trusts very own website you would know too. They are for an external cooler :bigthumb:. You can even go check the ebay link, it has the same description.

frivolous or not it would still be something to look into for a heavily tracked car, if not for anything other than preventing any trouble. It's not like it costs an enormous amount or anything, more than i'd spend if I never went to the track though.

so where do the fill and drain plugs go?

Well you need to ask yourself this question, what is a fill or drain plug anyway? Well simply put, they are two threaded devices that inhibit the flow of diff. fluid from the diff. to the exterior of the vehicle. Now in all reality two lines to a cooler will in essence do the same exact thing, thread in and keep the fluid inside the differential. Pop the lower line off to drain the fluid, put it back on, pop the upper line off to add the fluid, put it back on.

Most differentials don't even have drain plugs, you pop the cover itself off to drain the fluid. Then you replace the cover and put the new fluid in through a fill hole in the top of the differential case, not the rear cover.

I would hope they wouldn't make you disconnect the lines to change the oil.

Isn't this mostly true only on "live"/not independent axles, where the differential cover is NOT a stressed/mounted part ?

I believe most import (Japanese & European) cars with independent rear-axles have drain plugs.

:-) neil

Anyone found out if it helps strengthen the integrity of the rear diff case? Guess i'm calling Greddy today...

Jay7...

yea, I should have been more specific, you are correct though. I also shouldn't have said most, rather a lot.

what's the difference? lines, plug, your still "disconnecting" something to drain/fill the diff fluid, how else would you propose setting it up so you retain a drain and fill plug and also an external cooler? Not to mention diff fluid isn't something that gets changed every 3K miles, it's not like you'd be taking the lines off all the time.

Still hoping someone has pictures of it on a 7...

You would "Think" drift and "Race" teams would benefit the most with the differential locking and unlocking in the turnsm, yet from what I've read they either go Kaaz, or some sort of custum rear cradle / diff setup... so it seems like it might do something but not enough over stock for the street people to care, and not enough for the race people to not consider an aftermarket setup due to the weakness of the stock torsen...

Hey DCrosby, you happen to know of any examples of these custom rear cradle/diff setups on FDs?

so, anyone have a picture of it on a rx-7?

http://www.swapcartech.com/forum/showthread.php?t=884

And Jimlab's Cobra Diff setup are the only ones I'm aware of... I would think they'd work with a stock (Non Ls1) FD as well... I've never had the Privelage to Look at racecar diff setup except for Rotary Power's Drifter... and I remeber them just reinforcing the welds, and adding some solid mounts instead of rubber....

-DC

Oh ok...I know those two. I thought you had some info on a custom rear setup from some JDM tuners... Thanks for the info though!

Bah! First off, solid diff mounts make the diff weaker. Allow me to explain. If you have rubber or urethane insulating there is something to allow for a certain amount of deflection for the torsional forces applied to the differential. Henceforth the only benefit of a solid mounted diff is more power application to the ground due to these "absorbers" of torsional force being eliminated. Also, differentials with these lacks of drain plugs are domestic only and a terrible design due to the fact that every time you want to change fluids you have to re seal your diff. The greddy unit is only for added fluid capacity due to most "serious" drift and track cars utilizing clutch type diff's. More fluid means that it takes longer to heat soak and with all of the added cooling fins makes the higher fluid capacity cool off faster. It is an unnecessary upgrade for a street car or a car with the stock differential. Thank you, come again.

--Hank

Bumpin this up.

I had the Greddy diff cover installed on my diff, and I'm going to be ordering oil tomorrow. IIRC the stock diff setup takes 1.2 liters; anybody have any idea what the Greddy diff cover turns that number into?

5 year bump... dam.

Need an answer, no point in making a new thread. Up until a few weeks ago, I didn't even know this part existed; maybe it can reveal to other FD owners that its out there.

Thanks for your informative contribution!

I would just buy 5 quarts (yes more than overkill) and just return what you don't use. Better safe than sorry.

I'm going to be using a GL-4 in the tranny and a GL-5 in the diff, so I'm only looking at the diff's capacity as of right now. I'm guessing two quarts of GL-5 plus 4 ounces of Slip Lock *should* be enough, but I was curious to see if anybody had a solid number. I'm ordering Amsoil(which has to be shipped) and would like to keep the purchase as accurate as possible.

Btw, I meant 1.2 quarts, not liters. I have to stop reading all of the overseas threads...

^What rear diff do you have?

IIRC my diff w/the Greddy cover took MUCH more fluid then I expected...... I think Fancy Pants Lance had a good idea (5 quarts) :lol:

^ That's because in addition to the larger pan on the bottom, the fill plug is much higher.


BTW, MADDSLOW, are you going to be tracking your car at the Carlisi meet?

KAAZ 1.5 way with a 4.44 final drive and the Greddy diff cover.


No sir, the diff is literally being put together right now down at JPR Imports in southern NJ(side note: James at JPR is a SUPER cool dude so far). I blew my stock diff at Rotaryfest and had to leave the car there. The new setup(minus the r+p) will have 0 miles on it and needs to be broken in. I'm using the KAAZ fluid for break-in for 500 miles, then swapping to Amsoil. I'll be there with both my Cayenne and FD(guess I have to pay entrance for 2 cars :-( ).

So how many quarts should I ideally put in?

Also, Rich doesn't believe the car will be ready for the track until its been to IRP(jk jk ;-) ).