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Reduction gears for 30" tyres
https://www.auszookers.com/forum/viewtopic.php?f=5&t=29361		 Page 1 of 1
Author:  bob9909 [ Sun Jan 08, 2012 12:36 am ]
Post subject:  Reduction gears for 30" tyres
Hey just looking at what kind of reduction gears would be required for 30/9.5/15 tyres? would a 1l transfer case still be a realistic option? or would you want more? I don't think I really understand the whole reduction gear thing outside of being told I need them :S

Also, are 30/9.5/15 tyres going to be too big on a sierra with a 2" lift? would a 2" body lift also be required?

I was looking at 235/75/15s originally, but am now considering the slightly larger tyre. Are are kinda an in between size of the 235/75's and the 31s people originally advised me against.

Would love to get some peoples opinions, as I am not very experienced in this area

Cheers :)
Author:  SierraDan [ Sun Jan 08, 2012 12:41 am ]
Post subject:  Re: Reduction gears for 30" tyres
2" with 30's would be fine.

4.16 reduction gears have 1ltr high range and 85% low.
I run these with my 31's and they are good! Pretty zippy around town and good in the rough stuff.

EDIT: skimmed a bit through that. Reduction gears give you more control in technical sections as opposed to going full noise holding on and hoping for the best.
As well as giving more torque to keep the car going at slow speeds so you're not slipping the clutch everywhere.
Author:  31zook [ Sun Jan 08, 2012 12:50 am ]
Post subject:  Re: Reduction gears for 30" tyres
SierraDan wrote:
2" with 30's would be fine.

4.16 reduction gears have 1ltr high range and 85% low.
I run these with my 31's and they are good! Pretty zippy around town and good in the rough stuff.


X2
Author:  Bugsta [ Sun Jan 08, 2012 5:45 am ]
Post subject:  Re: Reduction gears for 30" tyres
Lack of torque on steep climbs and having to slip the clutch is a big problem for me. 32's and an AT T-case is my next endeavor I think.
Author:  Shayne18 [ Sun Jan 08, 2012 6:48 am ]
Post subject:  Re: Reduction gears for 30" tyres
Hey man I'm running 30" with the 4.16 gears and only a 2" lift and it's all sweet, good in low range to if ur not goin big distances in it because 2H I'm lucky to get 95km an hour with no wind
Author:  SierraDan [ Sun Jan 08, 2012 7:34 am ]
Post subject:  Re: Reduction gears for 30" tyres
Shayne18 wrote:
Hey man I'm running 30" with the 4.16 gears and only a 2" lift and it's all sweet, good in low range to if ur not goin big distances in it because 2H I'm lucky to get 95km an hour with no wind

Yeah but you're having other problems.

I can sit on 110 without an issue with 31's, 3.9's and 4.16's.
Author:  bob9909 [ Sun Jan 08, 2012 7:42 am ]
Post subject:  Re: Reduction gears for 30" tyres
well I'll be rebuilding the engine soon, so she should have plenty of go! not too bad now to be honest, she has come a long way in the last month, but even though she is driving pretty good, she is burning heaps of oil)

So 2" lift, 30" wheels, what offset should I get on the rims? -13 like I had planned for 235/75/15's?
Author:  SierraDan [ Sun Jan 08, 2012 7:58 am ]
Post subject:  Re: Reduction gears for 30" tyres
Yep.
Author:  Shayne18 [ Sun Jan 08, 2012 9:46 am ]
Post subject:  Re: Reduction gears for 30" tyres
True true. I will keep quite
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