5.12 ratios - the real answers

[Wolverine]

I know u will tell me to search but I have and there are several different answers coming up. So back off

I want to put some vitara 5.12 ratios into a front sierra diff, so do I get them from the front or rear diff of a vitara.

Can I please have info only from people who have done it or do actually know cause like I said there have been several different answers in previous posts.

Cheers

[Ric]

vitara front is a 10 bolt,

whats the bolt pattern of a sierra front?

[bazooked]

im gonna tae an educated guess and say u will need the front crownwheel and pinion because of the direction that the teeth r cut, also i hope u got the same ratio in the rear.

[Wolverine]

Rear is taken care of, I am pretty sure its fronts so I will run with that. With the shim required does anyone know if it will be so if the diff is welded.

[roc box]

i think its front but youve got to change the side gears i think

[-Mandy-]

I have a set of COMPLETE N/T sierra diffs with 5.12 centres for sale

[NIK]

I have 4.6 vitara ratio and all I did was take it from the front of a vit and bolt it straight into the sierra housing, after I welded the side gears though.

[droopypete]

I know u will tell me to search but I have and there are several different answers coming up. So back off

I want to put some vitara 5.12 ratios into a front sierra diff, so do I get them from the front or rear diff of a vitara.

Can I please have info only from people who have done it or do actually know cause like I said there have been several different answers in previous posts.

Cheers

[droopypete]

I think my mates uncle may know, he has a suzuki motorbike,
I reckon it may fit, but it may not (that bit I am sure of)
you might have to change the catalitic converter as well, I heard something about that on the internet, so it must be true,



You will need 2 front vitara diffs with the ratio of your choice.
the vit front axle is the same as a sierra rear axle but the sierra front axle is smaller so you will have to swap in the sierra side gears in the front, good luck.
Peter.

[Bentzook]

Very easy,
two front Vit diffs - crown wheel and pinion
ratio - yr choice
add locker
bolt in
done.

[zookjedi]

are you planning on using your sierra centre or the vit centre? if the sierra just change the crown wheel and pinion , i didn't worry about shiming mine or my mates and there still going strong after about 2 years and there both welded ,

i thought there were issues using a vit centre as of lube problems or something? but dont quote me on that , i think it was DOZOOR that was saying about the differences strengths, weakness etc WAAAAAY back

cheers jai

[Wolverine]

Cheers dudes, thats what I needed!!!

[NIK]

The vit front will bolt straight into the sierra front. For the rear you need to put the vit ring and pinion into the sierra diff centre which i did coz its stonger or you could put the sierra side gears into the vit centre.

[DiddyZook]

Okay, so to get the 5.12 gearing into Sierra, I will need two Vitara front diffs? Need to find two donors not one?

Which year model Vitara do I need to visit in the middle of the night and leave up on blocks How can I tell what ring and pinion is in the diff without opening it up and counting teeth etc?

If aftermarket (Rocky Road) 4.57 gears provide a 23% overall reduction and 5.38 gears provide a 44% overall reduction. I assume that 5.12 will be around the 30-35% mark and will bring 33" back pretty close to stock, is this correct?

If 5.12s are installed in the Sierra diff, what impact will this have on a locker (okay i know someone will say "just weld it", but will a Sierra locker still fit?)

[droopypete]

Okay, so to get the 5.12 gearing into Sierra, I will need two Vitara front diffs? Need to find two donors not one?

Which year model Vitara do I need to visit in the middle of the night and leave up on blocks How can I tell what ring and pinion is in the diff without opening it up and counting teeth etc?

If aftermarket (Rocky Road) 4.57 gears provide a 23% overall reduction and 5.38 gears provide a 44% overall reduction. I assume that 5.12 will be around the 30-35% mark and will bring 33" back pretty close to stock, is this correct?

If 5.12s are installed in the Sierra diff, what impact will this have on a locker (okay i know someone will say "just weld it", but will a Sierra locker still fit?)

1. Yes 2 Vits with the same ratio
2. carbed 1.6= 5.125
3. you do the math
4. I have 5.125's in mine and 2 air lockers.

[Mudzuki]

I run 5.12s and 34s, the gearing is just as good as stock on 26s

[droopypete]

I run 5.12s and 34s, the gearing is just as good as stock on 26s

I run 5.12s, a series 3 and 33s, the gearing is just as good as stock on 22's

[nicbeer]

Would running 5.12s with 1ltr and 31's be a bit too low?

Lockers - do sierra lockrights still fit or do you need vitara lockers

cheers

[droopypete]

Would running 5.12s with 1ltr and 31's be a bit too low?

Lockers - do sierra lockrights still fit or do you need vitara lockers

cheers

define "too low",
you use Sierra lockers.

[nicbeer]

Hmm, too low for street driving. I do 100 often between wheeling and home. What sort of rpm will it be revving at. i also do a bit of sand and mud driving that need some wheel spped. I am guessing i would be using 3rd instead of 1st on the sand.

I am guessing for rockhopping it would be ok for.

cheers

[raqmup]

Hmm, too low for street driving. I do 100 often between wheeling and home. What sort of rpm will it be revving at. i also do a bit of sand and mud driving that need some wheel spped. I am guessing i would be using 3rd instead of 1st on the sand.

I am guessing for rockhopping it would be ok for.

cheers

For a lil' while I ran 31's with 5.12's & dual tfc's on the road- was doing 4,200 rpm at around 100 33's with the above equal around 3,900rpm at 100 and yes- feel like stock tyres in the way the acceleration behaves. Got lockers in both- not that that makes a difference in final drive anyways
Hope that answers ur question mr nicbeer

p.s. crawls a smooth 52:1 in low/low and pulls like a freight train in low

[droopypete]

Hmm, too low for street driving. I do 100 often between wheeling and home. What sort of rpm will it be revving at. i also do a bit of sand and mud driving that need some wheel spped. I am guessing i would be using 3rd instead of 1st on the sand.

I am guessing for rockhopping it would be ok for.

cheers

you have a 5 speed box, don't get locked into the notion that you need to be in 1st low all the time.
I have 5.125:1's, 33" tyres and a series 3 r/hoppper, my engine is doing 4500 RPM @ 100 KM (approx) it is not good for my engine on the way to the bush, but it is great when I get there
Peter.

[nicbeer]

Whats the strength of these like. I have heard stories of lacking in meat on the crown.

Thanks on the gear info. looking better the more i look at it.

What have people paid for them before, may have found a couple but unsure what to pay for them.

cheers

[Beastmavster]

Would running 5.12s with 1ltr and 31's be a bit too low?

Lockers - do sierra lockrights still fit or do you need vitara lockers

cheers

ummm... yeah


Whats 31/26? Then what's 5.12/3.73?

The difference between them is the % change to rpm

31/26 = 1.2:1

5.12/3.73 = 1.37:1

If you want 20% shorter gearing than stock go for it.

remember there are 4.6 and 4.8 vitara cenrtes too