Notice: We request that you don't just set up a new account at this time if you are a previous user.
If you used to be one of our moderators, please feel free to reach out to Chris via the facebook Outerlimits4x4 group and he will get you set back up with access should he need you.
Recovery:If you cannot access your old email address and don't remember your password, please click here to log a change of email address so you can do a password reset.

Diff Ratios

General Tech Talk

Moderators: toaddog, TWISTY, V8Patrol, Moderators

Post Reply
Posts: 512
Joined: Fri Sep 16, 2005 12:36 pm
Location: Central Coast, NSW

Diff Ratios

Post by justinshere »

Hey

Posted a similar question in the Nissan section but i want more input.

What are other peoples thoughts on running a ratio of 4.375 in the rear and 4.300 in the front?
I thought it may cause abit of binding and something will end up snapping.
----------------------------------------------------
Xcab Lux on 37 Treps
Posts: 671
Joined: Mon Aug 23, 2004 10:06 am
Location: Mornington

Post by YankeeDave »

bad idea, you'll wind up your transfer case quick
Jeep Wrangler TJ

Jeep Cherokee XJ
Posts: 1544
Joined: Tue Oct 22, 2002 8:37 am
Location: Performing booty fab in my Garage

Post by Wooders »

It is ok to run SLIGHTLY different ratios - altho 0.075 is probably a bit much.

That said MOST of the time you would be using 4x4 is going to be on loose surfaces, and even if there was a bit of windup - I doubt it would kill you t/case unless you tried it on road.....
Cheers [url=http://www.wooders.com.au]Wooders[/url]
Posts: 4882
Joined: Fri Nov 08, 2002 8:36 pm
Location: Medowie, NSW

Post by redzook »

part time 4wd?

id run it .075 is nothing
Team UNDERDOG #233
WERock Australia thanks to
[url]http://www.longfieldsuperaxles.com[/url]
[url]http://www.rockbuggysupply.com[/url]
Posts: 918
Joined: Sun Aug 20, 2006 11:46 am
Location: Western Brisbane

Post by Highway-Star »

May I ask why? Diff availablity or something...

I personally wouldn't, but sounds like some people would. If the vehicle had a centre diff it would be a piculular way of transfering more torque to the lower end (or am I just tired).
Wheeling on completely wicked angles, without even looking stable.
Posts: 1857
Joined: Fri Feb 02, 2007 12:16 am
Location: ipswich

Post by nastytroll »

I've seen a transfer go bang with 4.11 n 4.1 ratio's in a 75 series
Posts: 1836
Joined: Wed Aug 11, 2004 10:41 am
Location: Brisbane

Post by badger »

nasty troll do you realy think thats what caused it?
the difference between makes of tyres or a brand new compared to half worn tyre is more than .1
1hd-fte 5 speed tiptronic 105 series
78 series troopy for work
gu ute play truck For sale
FTE 80 series sahara Sold

i think i have a problem
Posts: 1857
Joined: Fri Feb 02, 2007 12:16 am
Location: ipswich

Post by nastytroll »

add it up over the amount of turns at 80km/h. I would not have thought it would of been the problem, but did see it. Must have been the shitty toyota tranfer huh
Posts: 1857
Joined: Fri Feb 02, 2007 12:16 am
Location: ipswich

Post by nastytroll »

add it up over the amount of turns at 80km/h. I would not have thought it would of been the problem, but did see it. Must have been the shitty toyota tranfer huh
Posts: 14668
Joined: Mon Aug 29, 2005 7:10 pm
Location: western shitney

Post by j-top paj »

nastytroll wrote:I've seen a transfer go bang with 4.11 n 4.1 ratio's in a 75 series
thats because toyotas are weak :lol:
Banzy wrote:Dial up internet.........you'd post something and come back 2 beers later to see if it loaded.
my GU
Posts: 14668
Joined: Mon Aug 29, 2005 7:10 pm
Location: western shitney

Re: Diff Ratios

Post by j-top paj »

justinshere wrote:Hey

Posted a similar question in the Nissan section but i want more input.

What are other peoples thoughts on running a ratio of 4.375 in the rear and 4.300 in the front?
I thought it may cause abit of binding and something will end up snapping.

i thought u were after 4.88 or 4.6 :?
Banzy wrote:Dial up internet.........you'd post something and come back 2 beers later to see if it loaded.
my GU
Posts: 1544
Joined: Tue Oct 22, 2002 8:37 am
Location: Performing booty fab in my Garage

Post by Wooders »

nastytroll wrote:I've seen a transfer go bang with 4.11 n 4.1 ratio's in a 75 series
Not doubting the T/case went bang - but i REALLY seriously doubt it was the 4.10 & 4.11 difference.
Infact for the dana diffs 99% of the time the ratios will be mixed 4.10& 4.11, or 4.56 & 4.55 etc....
Also I have seen people drive on dry bitumen with the t/case locked in 4hi (they wanted to upgrade) and drive over a few days the transfer case still showed not signs of damage - but it was a pig to turn untill the tyres slipped a bit ;)

Anyhow my point is running different gears expoding t/cases is bit of a myth. The most common cause I have seen is where the prop shaft slip has been neglicted of grease, seized and the smashed the t/case.
Cheers [url=http://www.wooders.com.au]Wooders[/url]
Posts: 1836
Joined: Wed Aug 11, 2004 10:41 am
Location: Brisbane

Post by badger »

also who the hell does 80k in 4wd on a hard surface?
they prob deserve there transfer to blow up and lodge in there but.

yes for verry short distances between tracks or on the beach but neither of these will cause wind up
1hd-fte 5 speed tiptronic 105 series
78 series troopy for work
gu ute play truck For sale
FTE 80 series sahara Sold

i think i have a problem
Posts: 512
Joined: Fri Sep 16, 2005 12:36 pm
Location: Central Coast, NSW

Post by justinshere »

Highway-Star wrote:May I ask why? Diff availablity or something...

I personally wouldn't, but sounds like some people would. If the vehicle had a centre diff it would be a piculular way of transfering more torque to the lower end (or am I just tired).
Hilux front and GU rear - for the moment
----------------------------------------------------
Xcab Lux on 37 Treps
Posts: 512
Joined: Fri Sep 16, 2005 12:36 pm
Location: Central Coast, NSW

Re: Diff Ratios

Post by justinshere »

j-top paj wrote:
justinshere wrote:Hey

Posted a similar question in the Nissan section but i want more input.

What are other peoples thoughts on running a ratio of 4.375 in the rear and 4.300 in the front?
I thought it may cause abit of binding and something will end up snapping.

i thought u were after 4.88 or 4.6 :?
Yeah that would be ideal BUT i wanna get the truck started and if i can get away with running 4.3 and 4.375s with no probs i will do that for a little while.
After the post in the nissan section ive decided i want to run genuine gearing not aftermarket. So 4.6 will be the go but 4.3s might have to do in the meantime.
I dont want the 4b to be off the road for anylonger than a weekend and it wont take any longer than 2 days to change out the rear diff.
Front will take longer cos of steering etc
----------------------------------------------------
Xcab Lux on 37 Treps
Posts: 1836
Joined: Wed Aug 11, 2004 10:41 am
Location: Brisbane

Post by badger »

just do it. and keep in the back of your head its not exactly perfect so dont drive on bitumen or the like in 4wd:P
1hd-fte 5 speed tiptronic 105 series
78 series troopy for work
gu ute play truck For sale
FTE 80 series sahara Sold

i think i have a problem
Posts: 918
Joined: Sun Aug 20, 2006 11:46 am
Location: Western Brisbane

Post by Highway-Star »

justinshere wrote:
Highway-Star wrote:May I ask why? Diff availablity or something...

I personally wouldn't, but sounds like some people would. If the vehicle had a centre diff it would be a piculular way of transfering more torque to the lower end (or am I just tired).
Hilux front and GU rear - for the moment

Got ya.

In a strange way I would relate it to running a weded diff on road. Its not the best analogy, but you see my point? If you have to do it, try it; then tell us how you go with it, so any future people can see if had any adverse effects.
Wheeling on completely wicked angles, without even looking stable.
Posts: 7345
Joined: Wed Jun 02, 2004 3:29 pm
Location: Melbourne

Post by Gwagensteve »

Not really.

If it am right, the difference is about 1.7%, which doesn't sound like much, but with 33" tyres, the difference is 45mm per turn of the tyres. in 60 turns of the tyres, (or 162metres) you will be one whole turn of the tyres out.

On a hard surface, that will destroy a transfer case. (Doesn't have to be tarmac - smooth hardpack dirt would do it.

Many years ago, I was running a 33's with a 31 as a spare. Anyway, I had a flat and my G has no freewheeling hubs, so one front wheel was running a 31 and the rear was on 33's. Now I grant this is a 7% difference.

Anyway, I accidently bumped it into 4wd on the highway and the binding was so bad it was like a just jumped on the brakes.

Ford always used to run 4.09 front and 4.11 rear in their f series, but that is pretty insignificant. (0.4%)

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]
Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests