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5:12 vs rockhoppers
5:12 vs rockhoppers
just wondering what u guys think 5:12 diff gears or rockhoppers
You should have done a search, there's a fair bit on info on this.
If you want to run 31's, 5.12's are a bad choice.
revs @ 100kph, 5.12's, otherwise stock: 3829 - and remember that's with only about a 27% improvement in crawl ratio- 33:1 - 42:1
If you stepped up to, say, RH series 4, your gearing would be back to stock on the highway - 3437 @ 100kph, but your crawl will go to 86.3:1 - much better (and twice what you get with 5.12s)
that's my take on it.
Steve.
This is a rep0st from Dank's thread on 4.9 gears and 33's:
A certain workshop in Vic was anti rockhopper and would only recommend dual transfers and/or 5.12 diffs.
In an otherwise stock car, 5.12 diffs will correct big tyres onroad fine, but only provide a 42:1 crawl which is OK for mud but not suitable for steep country. It also really requires a 1.6 to be drivable, Which the particular workshop also really liked to sell. Not bagging anyone, just pointing out facts.
If you divide tyre size by gearing you get a better idea of actual gearing offroad.
Stock sierra: 33.3:1/26 tyres: 1.28 tyre corrected crawl
Stock sierra, 5.12's, 34's: 1.19 tyre corrected crawl
Stock sierra- 34's, 6.4 Case:- 2.50 tyre corrected crawl.
A stock sierra with 34's and 5.12's is about 10% TALLER GEARED off road than a stock sierra with 26" tyres. With the added traction of bigger tyres, it's not going to work on the steep stuff.
[/i]
If you want to run 31's, 5.12's are a bad choice.
revs @ 100kph, 5.12's, otherwise stock: 3829 - and remember that's with only about a 27% improvement in crawl ratio- 33:1 - 42:1
If you stepped up to, say, RH series 4, your gearing would be back to stock on the highway - 3437 @ 100kph, but your crawl will go to 86.3:1 - much better (and twice what you get with 5.12s)
that's my take on it.
Steve.
This is a rep0st from Dank's thread on 4.9 gears and 33's:
A certain workshop in Vic was anti rockhopper and would only recommend dual transfers and/or 5.12 diffs.
In an otherwise stock car, 5.12 diffs will correct big tyres onroad fine, but only provide a 42:1 crawl which is OK for mud but not suitable for steep country. It also really requires a 1.6 to be drivable, Which the particular workshop also really liked to sell. Not bagging anyone, just pointing out facts.
If you divide tyre size by gearing you get a better idea of actual gearing offroad.
Stock sierra: 33.3:1/26 tyres: 1.28 tyre corrected crawl
Stock sierra, 5.12's, 34's: 1.19 tyre corrected crawl
Stock sierra- 34's, 6.4 Case:- 2.50 tyre corrected crawl.
A stock sierra with 34's and 5.12's is about 10% TALLER GEARED off road than a stock sierra with 26" tyres. With the added traction of bigger tyres, it's not going to work on the steep stuff.
[/i]
[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]
ok
i have 5:12s in my sierra with 31s.would prefer hoppers but the diffs were cheapm at the time and simple.The 5:12s get it reving a bit on the highway and in the bush generally they are a good gear for the trail but in the tight stuff or big climbs i am on the clutch a bit which you dont want. matt
sierra truggy,37 sticky treps,propane,6.5s and disconnect,lux diffs with spools,16" fox shox,hydro steer.
i ran both 5.12's and 4.1 transfer gears on 31's on road with the reduction from the series ones %12 and the reduction of the 5.12's was ok at around 80km could do 100 but it would be revving pretty hard , off road was great , for the $$ 5.12 probably cheaper but if i did only one id be the transfer gears , but in combination the lower diff gears help take the load of the transfer case , but thats more of a worry for offroad not onroad .
jai
jai
if its worth doing do it intensly , better still do it with MADPASSION
set your limits way beyond your abilities
set your limits way beyond your abilities
Do you have a transfer breather? are you installing them properly? -i.e new intermediate shaft with each install, new bearings etc?
Not having a go, it's just 31's are ridiculously small tyres to be blowing RH gears with. We have a car running over 35" on RH4's and it's had a pretty good workout, no problems. (and they are very quiet)
I know RH3's were hand grenades, but 4's seem much better.
I will say I didn't (and wouldn't, mostly due to apparently poor service and support) go RH in my car, Im running TT and to date couldn't be happier.
Steve.
Not having a go, it's just 31's are ridiculously small tyres to be blowing RH gears with. We have a car running over 35" on RH4's and it's had a pretty good workout, no problems. (and they are very quiet)
I know RH3's were hand grenades, but 4's seem much better.
I will say I didn't (and wouldn't, mostly due to apparently poor service and support) go RH in my car, Im running TT and to date couldn't be happier.
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]
The input will always be the one to go - it's the smallest gear, but man, that's a bad run. 31's should never stress the case that much.
I'm not crazy about RH, but as I said, the S4's seem to be pretty good.
Are you putting a new idler shaft in each time? These wear pretty badly and if not replaced will load up the input shaft gear.
TT supplies a new one with a gearset, and every one I have pulled out of a case has had significant wear.
Not having a go, but if you are a very hard driver, you might find 5.12's don't last either- the pinion is weaker.
Steve.
I'm not crazy about RH, but as I said, the S4's seem to be pretty good.
Are you putting a new idler shaft in each time? These wear pretty badly and if not replaced will load up the input shaft gear.
TT supplies a new one with a gearset, and every one I have pulled out of a case has had significant wear.
Not having a go, but if you are a very hard driver, you might find 5.12's don't last either- the pinion is weaker.
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]
but every one said the s3 were good and the s1 were hand grenades , now its s3 and 4 are good ? my s1 are still going strong (i dissasembled the case last year to pull out the ball bearings and the gears are fine as) i think alot of it has to do with driving style and maybe oil used ? i use 85w 140 wich is good for hi load applications , and im not altogether real gentle with my car , but i dont totally abuse it either , but i was running 5.12's as well that would take alot of strain of the gears as well .Gwagensteve wrote:Do you have a transfer breather? are you installing them properly? -i.e new intermediate shaft with each install, new bearings etc?
Not having a go, it's just 31's are ridiculously small tyres to be blowing RH gears with. We have a car running over 35" on RH4's and it's had a pretty good workout, no problems. (and they are very quiet)
I know RH3's were hand grenades, but 4's seem much better.
I will say I didn't (and wouldn't, mostly due to apparently poor service and support) go RH in my car, Im running TT and to date couldn't be happier.
Steve.
if its worth doing do it intensly , better still do it with MADPASSION
set your limits way beyond your abilities
set your limits way beyond your abilities
And you're right.... which is why I have TT in my car.
I have read Brent's piece on going diffs and transfer to "load share" the reduction if you will, and I agree, except that there are too few diff gear steps and too much reduction in the transfers to make this viable. I want as much reduction as I can get offroad, so I;m not going to compromise the off road ability of the car and dig into both diffs because 10% of transfers fail.
If you have 25%reduction in the transfer and 25% taller tyres..... what's the point in gearing the diff anyway?
I am disappointed to hear of S4 failures though, i though they were well sorted. I can't help but think the materials are inconsistent- some have had every RH last through miles of abuse, and others have have them fail with barely any use at all.
Steve.
I have read Brent's piece on going diffs and transfer to "load share" the reduction if you will, and I agree, except that there are too few diff gear steps and too much reduction in the transfers to make this viable. I want as much reduction as I can get offroad, so I;m not going to compromise the off road ability of the car and dig into both diffs because 10% of transfers fail.
If you have 25%reduction in the transfer and 25% taller tyres..... what's the point in gearing the diff anyway?
I am disappointed to hear of S4 failures though, i though they were well sorted. I can't help but think the materials are inconsistent- some have had every RH last through miles of abuse, and others have have them fail with barely any use at all.
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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