Outer Limits 4x4 Board

hey im looking at running 31" tyres on my sierra with standard diff ratio , i am wondering what gears are gonna work on road? i want the lowest of ratio's for comps/rocks but would like to know how it would be with eg. 31"mtrs and series 3 rockhoppers on the black stuff any help would be greatly appreciated.

sierra's were geared low from da start so putting 28's or 29's helps it out but with 31's, the gearing will be a tad highger than good.a cheap option is a 1litre transfer case might help a little. sumwer around 15% reduction in gears

correct if wrong
Dave

I think S3 is a little to low for 31's on road. If I'm not wrong HRZ00K ran that setup on his Sierra. I think S1 are what the people use to keep the gearing as close to stock as it can be with 31's.

Will

Fair few people ran s3 with 31's, HRZOOK, RBZOOK. It does rev pretty hard at 100/110, not exactly suited to freeway, but not that bad. I run calmini 5.14:1 gearset, high is same as s3 from memory, and its okay but does rev higher. As for low gearing from stock, not really. Series 1 ratio's were good in high with 31's (till i blew mine up then they sucked ) but low wasnt quite low enough some times.
Layto....

abit out of the bibal

RH1 + wt diffs = 3.652 x 4.100 x 3.700 = 55.401
RH1 + nt diffs = 3.652 x 4.100 x 4.111 = 61.555
RH1 + 5.12s = 3.652 x 4.100 x 5.125 = 76.738

just to give to an idea

I run 31' simexs with Series 3's, wasnt particularly impressed with highway driving. Now changed ratio from 3.7 to 3.9 and are quite happy.

munecito wrote:I think S3 is a little to low for 31's on road. If I'm not wrong HRZ00K ran that setup on his Sierra. I think S1 are what the people use to keep the gearing as close to stock as it can be with 31's.

Will

Who wants stock? Isn't the point of gearing to get your crawl ratio lower?
My revs on the freeway but not too bad and I can always get bigger tyres

So with 31's and the s3 what revs does your sit on at 100km/h HR?

ofr57 wrote:abit out of the bibal

RH1 + wt diffs = 3.652 x 4.100 x 3.700 = 55.401
RH1 + nt diffs = 3.652 x 4.100 x 4.111 = 61.555
RH1 + 5.12s = 3.652 x 4.100 x 5.125 = 76.738

just to give to an idea

I thought narrow tracks were 3.9, and wt were 3.7

the 4.1 are 1 litre diffs? yeah?

I have S3 rh, with 5.29 hilux. gives 118 in low.
with 37's
on the highway it does 4100 @ 100
4500 at 110.
but it gets there quiet quickly for a large suzuki truck

ok thanks guys ill go for the s3 cos the low range should be pretty good...who cares bout high range hey,its not a daily driver so itll be good...thanks again

i run 31 simexs with S3 and isnt too bad on the highway. If it makes it to 100kmh then its usually reving just under 4000rpm but unless real flat the engine doesnt have enough torque to get up to 100. Id personally suggest the calmini 5.14's. 18% reduction in high compared to 22% in S3 which may be just right i think and low range is still good. S1 not low enough

hey just double checking, i can get my hands on a 1.0L transfer case with 4wd switch from hypozook.....i am able to put series 3,calmini or similar gears in this case right? thats wat i have been told. just wanna make sure.thanks for the help.

Zookified wrote:So with 31's and the s3 what revs does your sit on at 100km/h HR?

umm around 4/4.5 K I think from memory

muzook wrote:hey just double checking, i can get my hands on a 1.0L transfer case with 4wd switch from hypozook.....i am able to put series 3,calmini or similar gears in this case right? thats wat i have been told. just wanna make sure.thanks for the help.

The 1.0lt transfer cases are geared lowered then the 1.3 therefore the r/c gears aren't required. The 1.0lts aren't as low but if you want gears fit them to the 1.3 transfer case.

Can't ya fit the gears into that 1L case? I thought the cases are the same.



Nic

For the record; I have a 1ltr on 30"s and low SUX. With the standard 4.1 diff gears it reving at 5000rpm ish in 4th (top) at 100kph.
S1 gears would have to be better.

nicbeer wrote:Can't ya fit the gears into that 1L case? I thought the cases are the same.
Nic

The experts now say all after market gear sets will fit all 4wd lighted T-cases.
I'd use the 1.3 if you want to fit gears, as it will be slightly newer, better condition.
Fitting the 1.0 litre case is so you get a 10% reduction in gearing cheaply.
I'd fit the 1.0 case to use as is, while you have the 1.3 case fitted with gearing.

Just my opinion, others may differ

christover

Hi jack: Christover, Hows that front lokka working out ?

Zute wrote:For the record; I have a 1ltr on 30"s and low SUX. With the standard 4.1 diff gears it reving at 5000rpm ish in 4th (top) at 100kph.
S1 gears would have to be better.

or a 5th gear

CairnsZook wrote:

Zute wrote:For the record; I have a 1ltr on 30"s and low SUX. With the standard 4.1 diff gears it reving at 5000rpm ish in 4th (top) at 100kph.
S1 gears would have to be better.

or a 5th gear

Only if its a 5 speed , Guessing by the fact its a 1L, its most likely a 4 spd. THere was a 1L 5sp on ebay a while ago, though its prob not worth it just check another motor in there (1.3L and 5 spd) if you wanted too pretty easy. Christover has done this conversion. S1 would be much better than 1L gearing definatley.
Layto....

I have been told that the stock 1lt transfer case is 12% lower in gearing than the stock 1.3lt transfer case is this correct??


If that is correct and i got myself a 1.3 case to suit my 1lt sierra with a set of series 4 rockhoppers (which i think are 6.5:1's) in it which is a reduction of 25% in high range does this mean it is actually a reduction of 13% over the stock 1lt case.

I am just trying to work out what my road speed would be after the change of case.

Cheers
Simon

I thought its a 12% reduction from the imput of the T-case ? whats the reduction of a 1.3 ?

lay80n wrote:

CairnsZook wrote:

Zute wrote:For the record; I have a 1ltr on 30"s and low SUX. With the standard 4.1 diff gears it reving at 5000rpm ish in 4th (top) at 100kph.
S1 gears would have to be better.

or a 5th gear

Only if its a 5 speed , Guessing by the fact its a 1L, its most likely a 4 spd. THere was a 1L 5sp on ebay a while ago, though its prob not worth it just check another motor in there (1.3L and 5 spd) if you wanted too pretty easy. Christover has done this conversion. S1 would be much better than 1L gearing definatley.
Layto....

you tool...he is saying a 5th gear would be better than the 4speed...


did anyone find out if it was the "carry" box on ebay

stuff it just put 5.12 r&p ad run 32"s with a stock case its cheaper than putting gears in