Diff Ring and pinion gears (Final Drive)

Born_disturbed · Post by **Born_disturbed** » Tue Jun 05, 2012 10:28 pm

Hey guys

Wondering if anyone knows the easiest way to get a 3.63 (Or 3.308 ha) ratio Ring and pinion set over here.

Wanting one that will fit with a 1.8 size diff rather than the 1.6 one but I will take a 1.6 one if that is all I can find.

Did our NB's come with them? As far as I can tell so far for the 3.63 I would need one from an Aus Spec NB MSM or an old early 80's RWD 626. As for the 3.308 it would need to be from a specifically optioned early 80s b2000 diesel and would require modding to fit.

Anyone looked into this? A lot of the info on the net is rather out dated and I don't want to go paying $500 US just for a Ring and Pinion O.o

last_resort14 · Post by **last_resort14** » Tue Jun 05, 2012 10:50 pm

I'm not gonna be very helpful here as far as finding a diff goes,
But can i ask why are you looking at such high ratios?

Born_disturbed · Post by **Born_disturbed** » Tue Jun 05, 2012 11:00 pm

Sure!

I love the gearing of the NA 5 speed and diff however I now have a 6 speed to drop in.

If you drop in the 6 speed on the factory NA diff the gearing gets really short, the 6th gear ends up shorter than the normal 5th gear. This means your using more gas when cruising and First is almost pointless.

With the ratios I'm after the 6 speed 1-5 ends up almost bang on the factory 5 speed ratios (either slightly above or below depending) with 6 just being an extra gear for motorway cruising etc. My revs at 100kph with this combo would be 2480rpm or 2726rpm depending again. Factory 5 speed combo is 3113rpm and 6 speed + NA6 diff would be 3224 rpm.

And as i will be turbo soon enough the amount of acceleration i will lose from this will be countered by the extra power I will be putting in

Hope that covers it ha

Kieran · Post by **Kieran** » Wed Jun 06, 2012 10:40 am

Yeah even i think my stock NB 6speed gearing is a little high i cruise on the motorway at 100kmh around 3000 I would love to get that down to 2000 when i get a turbo

Kieran · Post by **Kieran** » Wed Jun 06, 2012 11:56 am

Heres a helpful calculator
http://www.flyinmiata.com/tech/gearing.php

Born_disturbed · Post by **Born_disturbed** » Wed Jun 06, 2012 12:20 pm

That's what I used to get my numbers

Donovan · Post by **Donovan** » Wed Jun 06, 2012 12:40 pm

hmm, according to their calculator, at 1500rpm, I am either going to be going 98km/h or about 110km/h, problem is I don't know what ratio the Holden diff is, could either be 3.1 or 3.4 from what I have looked up about it.

Born_disturbed · Post by **Born_disturbed** » Wed Jun 06, 2012 1:04 pm

Lucky for some...

Still need to figure out where i can get mine from

punkoutnz · Post by **punkoutnz** » Wed Jun 06, 2012 2:27 pm

Donovan wrote:hmm, according to their calculator, at 1500rpm, I am either going to be going 98km/h or about 110km/h, problem is I don't know what ratio the Holden diff is, could either be 3.1 or 3.4 from what I have looked up about it.

Jeez, that's just about redline on one of those V8s!

Donovan · Post by **Donovan** » Wed Jun 06, 2012 2:37 pm

Nah, think I have at least another 1500rpm more to play with, and after that I think the tyres will give up.

last_resort14 · Post by **last_resort14** » Wed Jun 06, 2012 9:13 pm

was thinking about this gear ratio stuff after talking to you (Born Disturbed) last night.

I know you are looking for higher ratios, but I would give a 4.1 a go and see how you go from there.

Theoretically my car with a 4.1 and 195/50/15 will do 225kmh in 6th at 7200 rpm.

do you really need much more than that? I cant think of a track in NZ where that would hold you back.

Plus 4.1's are easiest to find I would imagine.

Just some thoughts....

SLYDIT · Post by **SLYDIT** » Wed Jun 06, 2012 9:23 pm

mazda motorsports in the states do them and also i beleive that some of the early Kias used mazda diffs with varying ratios

http://www.solomiata.com/Drivetrain.html

Born_disturbed · Post by **Born_disturbed** » Wed Jun 06, 2012 10:03 pm

Ahh but with the 3.636:1 my cars top speed will be over 300kph

I will give finding the ratio i am after a go and then will start moving up the chain as needed.

That solo miata link has confirmed a few things for me so i will see what i can dig up

Angreal · Post by **Angreal** » Wed Jun 06, 2012 11:42 pm

300kph, reminds me of my friends R1. Factory limited to 300 it was, well until he changed the sprockets and gearing to get the thing to 250 in crazy fast times... I miss motorbikes

Angreal · Post by **Angreal** » Wed Jun 06, 2012 11:51 pm

300kph, reminds me of my friends R1. Factory limited to 300 it was, well until he changed the sprockets and gearing to get the thing to 250 in crazy fast times... I miss motorbikes

Ian · Post by **Ian** » Sat Jun 09, 2012 6:03 pm

Born_disturbed wrote:Hey guys

Wondering if anyone knows the easiest way to get a 3.63 (Or 3.308 ha) ratio Ring and pinion set over here.

Wanting one that will fit with a 1.8 size diff rather than the 1.6 one but I will take a 1.6 one if that is all I can find.

Did our NB's come with them? As far as I can tell so far for the 3.63 I would need one from an Aus Spec NB MSM or an old early 80's RWD 626. As for the 3.308 it would need to be from a specifically optioned early 80s b2000 diesel and would require modding to fit.

Anyone looked into this? A lot of the info on the net is rather out dated and I don't want to go paying $500 US just for a Ring and Pinion O.o

I think you will find that 6 speed NBs had the 3.636 diff ratio you are looking for, in which case the NZ dismantlers are your best bet. Brownie or Ross are good places to start.
Cheers

Donovan · Post by **Donovan** » Sat Jun 09, 2012 6:20 pm

huh, strangely enough I had one of those, but someone was too late making up their mind whether they wanted it, so it went.

Maybe get hold of Mad Kiwi, see if he is going to use it after all, he might sell it to you for a huge profit, since I pretty much gave it away.

Mad Kiwi · Post by **Mad Kiwi** » Sun Jun 10, 2012 10:25 pm

Born_disturbed · Post by **Born_disturbed** » Sun Jun 10, 2012 10:46 pm

Ha already talked to him about it... And it wanst couldnt make up my mind it was couldnt afford ha

Mad Kiwi · Post by **Mad Kiwi** » Sun Jun 17, 2012 12:36 pm

Please correct me if I am wrong but I think you have all been talking about the the 3.63 as if it was the 3.9 diff that came in the later 6 speed models....

Isn't the 3.63 the rare as, hard to get, only came in the last of the rwd 626's...diff?

SLYDIT · Post by **SLYDIT** » Sun Jun 17, 2012 1:59 pm

th 3.63 was fitted to te aussie cars as well

Ian · Post by **Ian** » Mon Jun 18, 2012 6:29 pm

Mad Kiwi wrote:Please correct me if I am wrong but I think you have all been talking about the the 3.63 as if it was the 3.9 diff that came in the later 6 speed models....

Isn't the 3.63 the rare as, hard to get, only came in the last of the rwd 626's...diff?

No.
Find a dismantler with a 6 speed NB and ask them to do the math.

Diff Ring and pinion gears (Final Drive)

Diff Ring and pinion gears (Final Drive)

Re: Diff Ring and pinion gears (Final Drive)

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