Outer Limits 4x4 Board

Hey guys, just wanting some info on transfer gears, i am getting some in the next few weeks and i am just trying to work out whether to get 4.9:1 or 6.5:1 gears? i have a 1995 sierra with a 1.3L and 31Inch muddies and my diff is nearly shagged so i might be getting a 1L diff centre. i just want to know what both these type of gear ratios will be like on and off road? what is the top speed on road and do they crawl well?
Any help will be greatly appreciated

skippa83 wrote:Hey guys, just wanting some info on transfer gears, i am getting some in the next few weeks and i am just trying to work out whether to get 4.9:1 or 6.5:1 gears? i have a 1995 sierra with a 1.3L and 31Inch muddies and my diff is nearly shagged so i might be getting a 1L diff centre. i just want to know what both these type of gear ratios will be like on and off road? what is the top speed on road and do they crawl well?
Any help will be greatly appreciated

and what are you planning to do with the 1ltr diff centre ?

i run 35's with the 6.5 gears and they crawl realy well but i run 4.88 diff gears . depends on the terrain you tend to drive as to what final crawl ratio would be best , if ya do alot of rocks go for the 6.5's but if mud and hills are more your thing id go with the 4.9 .

Hey just my two bobs i run the 6.5's in the sierra transfer case on my jimny and with 31's the gearing is way to low so im constantly useing 2 and 3rd gear 1st is like a tops of 5km/h but i dont know what my diff gears are sorry

ROK88 wrote:Hey just my two bobs i run the 6.5's in the sierra transfer case on my jimny and with 31's the gearing is way to low so im constantly useing 2 and 3rd gear 1st is like a tops of 5km/h but i dont know what my diff gears are sorry

thats why cars have a gearbox, i regularly use 4th and 5th low as 5low is a little
lower then 1 high. the 6.5s mean that i have 10 gears from slower then walking
pace to 120kph.

there is nothing wrong with driving in 4 low or whatever gear ya need to move
at the right speed.

im running 5.14s and WT diffs with 31's =) a 'true' 31 is 19.2% larger than factory and the calmini 5.14's are an 18.3% reduction in high range - which gets high range gearing nearly factory. But then we all know our 31's measure smaller - mine for example measure 30.7, which is almost exactly 18% larger than stock.

low range, i'm using 1st and 2nd on very difficult terrain where wheel speed isnt an issue (rock) and very frequently using 4th and 5th low.

sheps wrote:
thats why cars have a gearbox, i regularly use 4th and 5th low as 5low is a little
lower then 1 high. the 6.5s mean that i have 10 gears from slower then walking
pace to 120kph.

there is nothing wrong with driving in 4 low or whatever gear ya need to move
at the right speed.

You still then only have 2 gears in reverse, one which would be most likely to high ie clutch burner and the second too low to get any descent wheel speed if you find yourself in a situation where reverse is the only way out.

My 1c,
Dan

JrZook wrote:

sheps wrote:
thats why cars have a gearbox, i regularly use 4th and 5th low as 5low is a little
lower then 1 high. the 6.5s mean that i have 10 gears from slower then walking
pace to 120kph.

there is nothing wrong with driving in 4 low or whatever gear ya need to move
at the right speed.

You still then only have 2 gears in reverse, one which would be most likely to high ie clutch burner and the second too low to get any descent wheel speed if you find yourself in a situation where reverse is the only way out.

My 1c,
Dan

never had that happen in the 2 years that i have had the gears. don't forget that r high is still 20% lower then standard. i wheel a lot as well and have done over 50000ks on the gears. steep terrain is the only stuff i don't drive, as
there is none where i live.

yeah same goes - never had an issue with reverse speeds - usually low range reverse is the best, as i dont need to touch the brakes and can happily rev it up and do about 15km/hr - havent encountered a reverse situation yet that required more than that to back out.

what are the 6.5s like on the highway? what is your top speed

Good luck putting the 1.0 litre diff centre in the 1.3

On road there won't be much difference - 12% vs 20% or so (depending on whose gears you use) Bear in mind your tyres are already about 19% over stock, so the "better" on road result will be with the 6.5's IMHO.

Everyone I know whose ever had anything less than 6:1's has always ended up with 6:1's in the end (or wishes they had) Even in Vic, where we have very little rock and lots of long muddy hills.

If you have stock diff gears, I think the 6:1's would be pretty sweet. Low, for sure, but sweet. 4.9's would be OK, but you'll always wonder how much better it might have been if you were able to slow it down a bit more.

As for reverse - If you need lots of wheelspeed you obviously don't have much traction so high range will work fine.

I regularly use high reverse in both my Gwagen and sierra to build wheelspeed in mud.

Steve.

standard diff gears 6.5s and 31" extremes 8v 1.6 carby
no problem towing this at 100kph, just don't jump out in front of me

sheps wrote:

JrZook wrote:

sheps wrote:
thats why cars have a gearbox, i regularly use 4th and 5th low as 5low is a little
lower then 1 high. the 6.5s mean that i have 10 gears from slower then walking
pace to 120kph.

there is nothing wrong with driving in 4 low or whatever gear ya need to move
at the right speed.

You still then only have 2 gears in reverse, one which would be most likely to high ie clutch burner and the second too low to get any descent wheel speed if you find yourself in a situation where reverse is the only way out.

My 1c,
Dan

never had that happen in the 2 years that i have had the gears. don't forget that r high is still 20% lower then standard. i wheel a lot as well and have done over 50000ks on the gears. steep terrain is the only stuff i don't drive, as
there is none where i live.

Some of the old trails around edith falls, long before the road went in are pretty fun places to play.

david123 wrote:
Some of the old trails around edith falls, long before the road went in are pretty fun places to play.

it is a cyanide poisoned abandoned gold mine now and access to the rest of
it depends on the color off ya skin.

sheps wrote:

david123 wrote:
Some of the old trails around edith falls, long before the road went in are pretty fun places to play.

it is a cyanide poisoned abandoned gold mine now and access to the rest of
it depends on the color off ya skin.

used to shoot buff there, all gone hey, damit.

search (31zook) build on 4wdaction.com, I've got a gear calculator that i stole from izook.com... Its on the last page and 2nd from the top on page 10??? i think.
It will clear up all arguement, and i've worked out that a sierra vit case combo is the way to go

izook borrowed it from sugerloaf4wd.com but in the end jarred told them use it but you shouldve asked..

david123 wrote:

sheps wrote:

david123 wrote:
Some of the old trails around edith falls, long before the road went in are pretty fun places to play.

it is a cyanide poisoned abandoned gold mine now and access to the rest of
it depends on the color off ya skin.

used to shoot buff there, all gone hey, damit.

the buff are making a comeback, been finding them along the cullen and fergasson rivers. donkey's are plague proportions every where. i was working in kakudu when the betec shoot was on, sad to see floodplains white with bones.

I run 31'' tyres, 4.16 transfer gears and 3.9 diff gears with stock 1.3 no problems at 100kmh at around 3500 rpm and crawls really well in low range. Sometimes find it too slow but i just use high range then, also never had a problem backing out of things.Like steve said if u need to reverse that fast then your most likely not in a high traction situation.

jesse

i have a 95 sierra all standard diffs g/box and 1.3 with the low range 4.9's tranny gears running 31's. i find it great allround low is a bit too low 1st and sometimes 2nd (rutted/rocky hills) because i have open diffs but that is expected, locked it would be unreal. on road now i can sit on 100 in 5th instead of 4th, its about 3400rpm in 5th at 100 i think, actually sits on 110 easier than 100!

It's quite possible a sierra gets LESS capable than stock with transfer gears and no lockers because of the loss of wheelspeed and increased torque at the wheels tending to increase wheelspin.

Just my 2C

Steve.

Gwagensteve wrote:It's quite possible a sierra gets LESS capable than stock with transfer gears and no lockers because of the loss of wheelspeed and increased torque at the wheels tending to increase wheelspin.

Just my 2C

Steve.

I wouldn't go as far as saying that, however I agree to the extent that 1st Low is utterly useless except for controlled decents.
Unlocked zooks need momentum, so 2nd and 3rd low becomes your friend with transfer gears and open diffs.
Add a diff lock, and 1st and 2nd become the norm instead.
So yeah not less capable I dont think, Just needs different gear selection.

Highway-Star wrote:

Gwagensteve wrote:It's quite possible a sierra gets LESS capable than stock with transfer gears and no lockers because of the loss of wheelspeed and increased torque at the wheels tending to increase wheelspin.

Just my 2C

Steve.

I wouldn't go as far as saying that, however I agree to the extent that 1st Low is utterly useless except for controlled decents.
Unlocked zooks need momentum, so 2nd and 3rd low becomes your friend with transfer gears and open diffs.
Add a diff lock, and 1st and 2nd become the norm instead.
So yeah not less capable I dont think, Just needs different gear selection.

x2 lockers just make it a bit more controlled

skippa83 wrote:what are the 6.5s like on the highway? what is your top speed

with 31" Mickey Thomson's my car see's 130km/h. Will do 110km/h at around 4000rpm.

RockHopper wrote:

skippa83 wrote:what are the 6.5s like on the highway? what is your top speed

with 31" Mickey Thomson's my car see's 130km/h. Will do 110km/h at around 4000rpm.

Hoon

ZUKPOWER wrote:

RockHopper wrote:

skippa83 wrote:what are the 6.5s like on the highway? what is your top speed

with 31" Mickey Thomson's my car see's 130km/h. Will do 110km/h at around 4000rpm.

Hoon

lol nah. When I came out of the bush the other week back into mobile reception area, and found a message from the missus saying that my two year old was really crook and she was taking her to hospital, I just pretty much fanged it all the way from Lithgow to Liverpool. I'm getting too old to be a hoon. On another note, I'm really suprised at how strong these little 1300's actually are. The motor averaged from between 4000 - 5500 rpm all the way home, and she's still going strong