[QUOTE=Pele]Front and rear diffs WILL be the same gear ratio, guaranteed. QUOTE]
Although this is true in this case, as for front and rear axles being the same ratio, not always true but most of the time. For example, International, for those of you who remember international pick ups, had a higher ratio in the front axle than in the rear, but due to the obivious problems I believe this practice out with bell bottoms...

This is from the Archieves with a lot of different gear ratios from the Miatas to the Kia Sportage.
http://members.aol.com/solomiata/Drivetrain.html
Its an old post but it has alot of information.

Yes the ring and pinion from the S2000 do fit. not the whole pumkin, just the ring nd pinion

You're forgetting that you can use the transfer case to account for differential gearing. A good example of this is the 1st gen DSM AWD's. Two rather different ratios between the front diff and the rear.

nice write up good look with your engine swap, let me know how that rear runs LOOKING for a new rear for my GSLSE thinking of a ford v8 swap.

Update:
 

here's a update. It turned out that during my first test fitting, I used mis-matching axles (pre-S3 and a S3) due to mislabeled parts (and i thought I was good in keeping track on what I have). In any rate, it will work except the front diffy is open, not a LSD. Sorry about the confusion.

Ah! I forgot about AWD with a center differential. I keep thinking of manual 4wd that just locks the front and rear shafts together.

Learn something new everyday. :)

What I was trying to do was create a list of choices for people. If in the future someone else wants to go looking for other kinds of gears and they go shopping at the scrap yard. They can know what types of vehicles to look for.

I personally will be using a 1999 Miata differential with Torsen LSD and 4.30:1

Yeah, I knew what you were referring to though, most of the trucks/etc that have 4WD HI/LO run the same gearing and just directly drive from the tranny to the differentials (except for the low obviously), but there's always those whacky exceptions!

Anybody got a good junkyard source for these things? I wouldn't mind picking one up (though I'd really like something in the 4.44 range)

What would be better for autocrossing a stock port GSL with LSD a 4.77 or 4.44 rear end gears with stock exhaust ( for now) and upgraded suspention ( illuminas, eurathane bushings, and eibachs)??

doesn't anyone listen to me.... Sonic Rat just repeated what i said but no one listened until he said it...wtf?

I listen to everyone, don't feel bad, maybey you can answer my questions lol.

maybe, but be sure to ask me something I know...lol

I think they wanted a more common (and still used) method, and how the two varying ratios were dealt with. But yeah, pretty much.

I do but Im greedy and I will not reveal my sources. But if you wanna buy one from me, I will think about it.

PM me a price and I'll see what I can find locally as well (probably not much)

I'll buy that for a dollar...

What would be better for autocrossing/daily a stock port 1985 GSL with LSD a 4.77 or 4.44 rear end gears with stock exhaust ( for now) and upgraded suspention ( illuminas, eurathane bushings, and eibachs)??

How would top speed be effected, if it even would be efected?

Thanks ( I thought this is an apropriate question for the topic)

Top speed will be reduced but for street its not a big deal, ie at 60 mph in a 3.9 you are doing about 3000 rpm, with a 4.77 the rpm would be about 3600, still not high reving for a rotor.

For autocrossing and any other racing the LSD is a big advantage. Try to find a pumpkin that is an LSD ie: Miata 4.3 torsen, RB 4.44, and others....

so maybe this question has been answered on here but im alil slow sometimes but will this work for a 84 SE?

So the question I have to ask: Since these diffs are non lsd, can the ring and pinion be mated with our stock lsd diffs to reap the benefits?

To me, all a one legger with shorter gears is going to do is spin the one tire easier, and look sillier than usual.

From reading here, it sounds like any of these ring and pinions will fit on the stock pumpkin, which is really great for retaining the LSD. I don't know about some of the others here, but I would like to find a good way to strengthen the rearend while still keeping the stock bolt pattern and without going through major swaps like with a ford rear end. Is there anything we can do to strengthen the stock rear end without actually changing it?

Guru torsen and floating hub kit with billet axles. Proven to be very tough.

http://www.xtremerotaries.com/main2/..._inc_tbd_2.jpg

That setup is georgous. How much is that?

^^^Click on Guru on REVHEADS post

This is the price in AUS. money so you have to convert it.
Billet Axles $700.00 + GST
Hub Kits $1,800.00 + GST

either way i look at it in my eyes its a grip of cash. dont get me wrong it does look like a fug'g awesome setup ive looked at it b4 but right now its not in my price window.

edit: they are made for our car i never cought that b4! maybe i ll rethink this! ::thinking::