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customising sierra diffs

Tech Talk for Suzuki owners.

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customising sierra diffs

Post by ofr57 »

i was just wodering if any body has shaved there WT diffs and how much did you gain ...

i would presume 1 - 1/2 an inch ?

other point is the ball jiont the steering knuckle sits on ... has any one skulloped this to allow more lock? (this could make it weaker?)

or .... replace them with bigger ones to get more lock?
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Post by Gwagensteve »

there have been a few shaved ( I've done a pair) and yes there's a fair gain. I think 1.5" is pushing it - maybe 1" max. It is worth it though IMHO.

The lock limit is there to prevent destroying CV"s - that's where the engineering constraint is.

In any case you'll hit the wall with nearly everything at once if you try to increase lock - tyre on inner guard, tyre on chassis, tyre on spring, steering box travel.... basically more track width would be required (at the axle, not through rim offset of spacers) to make it work.

Steve.
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Post by ofr57 »

sorry steve i was saying between half an inch and a inch
hmm i want to keep a it suzuki

so would be a suzanna diff be the only way? .. i would presume these are wider + more lock but thats starting to get to big

other idea was to use the design idea ...umm i cant remember it is called
its incorporating a uni joint instead of a cv while still going into a ball joint


:?
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Post by Gwagensteve »

Yeah, I think a suzana would be the only feasible way. I've looked at double CV's and other weirdness but really it all looks too hard to me.

Suzana's have their downsides though, mostly scrub radius and clearances on a sensible height, sensible width car. - from what I've seen it seems scrub radius gets out of hand.

I do not believe that a uni that can fit into the stock swivel housing would be strong enough, and then you'll hit the wall with lots of other clearance issues as per my other post.

Also, not all uni yokes allow as much steering as you imagine. going over 40˚ seems to get very very big and expensive.

You're LWB yes? unfortunately, the ackerman angle isn't ideal on LWB sierras as it wasn't corrected for the added wheelbase. I think this adds to the lack of maneuverability LWB's have.

Steve.
[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]
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Post by ofr57 »

yes

I'm a lwb 1.3 nt
ATM planning to make the next bi step to make it very compective

with my car atm with the 31's on i dont get any scrub ... but when it is possiable to get the 33x10.5 KM2's they will be going under it
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Post by GRPABT1 »

I think most people don't bother shaving them as they're already pretty small.
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Post by ofr57 »

1 inch more is more than worth it
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Post by cj »

GRPABT1 wrote:I think most people don't bother shaving them as they're already pretty small.
I'm not most people :armsup:
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Post by alien »

i reckon - taking 1" off the diff is the same as going from a 31 to a 33... except shaving the diff is legal.
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Post by Gwagensteve »

Neither of us are most people cj ;) Poor us.....

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Post by cut 4B »

talk to rhett i got some wt diffs of him years ago and he shaved them and did a great job . they where great
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Post by ofr57 »

hmm

I was thinking rhett might be the man to see

i got some stripped diffs waiting to be done :D

on another note ... does anybody know the exact limiting factor for serria's lock ... i presume its the cv's but i could be wrong :?
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Post by Gwagensteve »

alien wrote:i reckon - taking 1" off the diff is the same as going from a 31 to a 33... except shaving the diff is legal.
Is it? Not having a go, lots of cool stuff isn't legal, but I'm pretty sure an engineer would be very interested in how it was done.

Steve.
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Post by alien »

i cant imagine that shaving the diff would significantly weaken it to a point it would require engineering... can you? and that said, a cop that pulls you over and sees 31's, SPOA, bigger engine etc, doubt he'd notice a shaved diff as being anything out of the ordinary, and for insurance, the diff would have to be the cause of the failure for it to be blamed for causing an accident right?...

im just theorising though. =)
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Post by Gwagensteve »

I don't disagree, but a diff housing is a structural member and cutting it is a structural modification.

They'd want to know. It's not automatically legal.

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Post by neil_se »

Legal schmegal. Anyone got more details or pics on doing it?
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Post by ofr57 »

http://www.izook.com/tech/samurai/drive ... suzana.htm

anybody know how wide a vitara rear diff is?
a suzana diff on a normal wt look abit wider anyways .. could this be countered in the back by using a vitara diff to equal it up :?
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Post by Gwagensteve »

Vitara rear diff is 130mm wider than wide track.

Diff offset is wrong too - it's actually slightly offset to the left.

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Post by zooker »

ofr57 wrote:http://www.izook.com/tech/samurai/drive ... suzana.htm

anybody know how wide a vitara rear diff is?
a suzana diff on a normal wt look abit wider anyways .. could this be countered in the back by using a vitara diff to equal it up :?
AFAIK muzook has this setup, suzana front vitara rear and is running 37's
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Post by BenT »

neil_se wrote:Legal schmegal. Anyone got more details or pics on doing it?
Image
Image

I have 32" Simex's and have 300mm under my diffs - about the same as a Hilux on 35" Simex's

Its well worth it if you drive lots of ruts - like we have here in NZ.

Ben
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Post by MUD-PIGSIERRA »

Nice work Ben, did you do that work yourself or have it done by a pro...?

Was it a straight cut of the bottom then a matter of fabbing up a plate to weld onto the bottom.........? Im guessing the extra trusses would also be a important mod with this sort of mod to keep strength.

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Post by mroffroader »

[quote="zooker"][quote="ofr57"]http://www.izook.com/tech/samurai/drive ... suzana.htm

anybody know how wide a vitara rear diff is?
a suzana diff on a normal wt look abit wider anyways .. could this be countered in the back by using a vitara diff to equal it up :?[/quote]

AFAIK muzook has this setup, suzana front vitara rear and is running 37's[/quote]

Please excuse my New Zealandness....What is a Suzana?
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Post by nicbeer »

mroffroader wrote:
zooker wrote:
ofr57 wrote:http://www.izook.com/tech/samurai/drive ... suzana.htm

anybody know how wide a vitara rear diff is?
a suzana diff on a normal wt look abit wider anyways .. could this be countered in the back by using a vitara diff to equal it up :?
AFAIK muzook has this setup, suzana front vitara rear and is running 37's
Please excuse my New Zealandness....What is a Suzana?
Suzuki Vit rear inner and Dana outers i beleive.
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Post by mroffroader »

[quote="nicbeer"][quote="mroffroader"][quote="zooker"][quote="ofr57"]http://www.izook.com/tech/samurai/drive ... suzana.htm

anybody know how wide a vitara rear diff is?
a suzana diff on a normal wt look abit wider anyways .. could this be countered in the back by using a vitara diff to equal it up :?[/quote]

AFAIK muzook has this setup, suzana front vitara rear and is running 37's[/quote]

Please excuse my New Zealandness....What is a Suzana?[/quote]

Suzuki Vit rear inner and Dana outers i beleive.[/quote]

Ahhhh...Cheers. Pity we don't really have dana diffs over here....You don't happen to know what model dana's do you? Or have a link to somewhere that could tell me a little more?

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Post by Rhett »

Its not just the extra clearance that is the big gain. They slide over stuff heaps easier than a full diff cos they lose that lip on the bottom that catches on obstacles
Its a wheelbase thing
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Post by nicbeer »

U check that link mroffroader?

While adding more power to the Grey Ghost project, we realized that harnessing that power at the axles was going to be a big chore. The gears had already been updated with a set of 5.12s and a locker, but we wanted to strengthen it from the axle shafts out. Click through for a closer look...Looking into the Trail Tough Suz-Ana series of front axle housings, we found out that they offered both a ‘Big’ and ‘Little’ version. The ‘Big’ version used a Sidekick/Tracker rear differential, larger axle shafts and a Dana 44 style knuckle setup. While very strong, it meant buying more gears, locker, etc. The answer was the ‘Little Suz-Ana’. While it shares the larger axle options and the Dana 44 style knuckles, it retains the use of the Samurai front differential with only a simple side gear swap.
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Post by ofr57 »

another idea i had today ... was to use spider 9 knuckles :?
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Post by Gwagensteve »

Have you priced them and the axles, unis, wheelbearing units and brakes they require? They're cool but there'd be $10K in the front easy by the time you could drive on it.

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Post by ofr57 »

:shock: there that much

just ... an idea
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Post by mroffroader »

[quote="nicbeer"]U check that link mroffroader?quote]

Yea, cheers for that nic
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