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sierra reduction gears
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Author:  zooky08 [ Mon Apr 19, 2010 11:36 am ]
Post subject:  sierra reduction gears
hey fellas

just wondering what are the pros and cons for having 6.5:1 reduction gears in a suzuki sierra with 29 inch tyres. will it increase or decrease my speed on the black top? im only getting 80 km/h. what percentage in low and high is the 6.5:1

thanks
Author:  lordfury007 [ Mon Apr 19, 2010 11:42 am ]
Post subject:  Re: sierra reduction gears
A good gearing calculator can be found here:

http://www.lepayne.com/gears.html

I'm not an expert, but I believe the higher gearing you go, the slower you go. (ie: 5.14 reduction gears will make the car go faster than 6.5 reduction gears) The advantage is you get better control of your car at low speed.
Author:  lump_a_charcoal [ Mon Apr 19, 2010 11:52 am ]
Post subject:  Re: sierra reduction gears
It should help your top speed -

I run 31s with the 6.5s, and can sit on 110 fairly easily (just takes a while to get there).
Author:  zooky08 [ Mon Apr 19, 2010 11:58 am ]
Post subject:  Re: sierra reduction gears
cool,i dont mind if i go real slow in low. thats pretty much what i want, just wondering if the 6.5s will make me go even slower then 80km/h or bring me back to 110km/h with the 29 inches
Author:  royce [ Mon Apr 19, 2010 11:59 am ]
Post subject:  Re: sierra reduction gears
if you cant get over 80 with that size tyres you've got other problems to work through first!!!
Author:  lump_a_charcoal [ Mon Apr 19, 2010 12:01 pm ]
Post subject:  Re: sierra reduction gears
the 6.5s will probably help your top speed, as well as making your low ratio very slow.

Rice is right though, sounds like your engine is clapped out.
Author:  zooky08 [ Mon Apr 19, 2010 12:07 pm ]
Post subject:  Re: sierra reduction gears
lump_a_charcoal wrote:
the 6.5s will probably help your top speed, as well as making your low ratio very slow.

Rice is right though, sounds like your engine is clapped out.




haha yea my motor is at 216333
ive got a 1.6 head on it, isnt tht for more power because of the bigger valves
Author:  stockman [ Mon Apr 19, 2010 1:25 pm ]
Post subject:  Re: sierra reduction gears
Check your compression and tune etc

I have over 200k and I can sit on 90 to 100 with 31's until I hit an incline
Author:  DMAC [ Mon Apr 19, 2010 1:50 pm ]
Post subject:  Re: sierra reduction gears
royce wrote:
if you cant get over 80 with that size tyres you've got other problems to work through first!!!


X2

I have 29" tyres with 6.5 gears. RPM increase by 250rpm to get 100km/hr. Speedo speed = 93km/hr = True speed = 100km/hr.

Sounds like mine when I first got it . Standard gears, 180k engine & 29" tyres, struggled to do 100km/hr flat to the floor, down a hill, with a tail wind, & drafting a truck. :?

Look at your engine and tuning.

Mine now has a rebuilt engine, mild cam, extractors & 6.5s easily do 100km/hr on highway about 1/3 throttle. :P
Author:  Zachius [ Mon Apr 19, 2010 2:35 pm ]
Post subject:  Re: sierra reduction gears
Yeah a properly running G13BA should be hitting 100km/h easily. I could crank mine up to over 110km/h on the freeway (it did have extractors + was running a bit rich).

I would not recommend 6.5s on 29's due to high range been to low (ie you will have to rev it hard to sit on 100 km/h)
Author:  zooky08 [ Mon Apr 19, 2010 2:52 pm ]
Post subject:  Re: sierra reduction gears
DMAC wrote:
royce wrote:
if you cant get over 80 with that size tyres you've got other problems to work through first!!!


X2

I have 29" tyres with 6.5 gears. RPM increase by 250rpm to get 100km/hr. Speedo speed = 93km/hr = True speed = 100km/hr.

Sounds like mine when I first got it . Standard gears, 180k engine & 29" tyres, struggled to do 100km/hr flat to the floor, down a hill, with a tail wind, & drafting a truck. :?

Look at your engine and tuning.

Mine now has a rebuilt engine, mild cam, extractors & 6.5s easily do 100km/hr on highway about 1/3 throttle. :P




Ok thanks for the info, I deffently no that it needs a tune up it runs like crap

I been thinking of geting reduction gears for my tyres and also for 4wding

I have already got extractors and I have a 1.6 vitara head, I think its the motor, its on its way out, would you no how much a rebuild would set me back thanks
Author:  zooky08 [ Mon Apr 19, 2010 3:00 pm ]
Post subject:  Re: sierra reduction gears
Zachius wrote:
Yeah a properly running G13BA should be hitting 100km/h easily. I could crank mine up to over 110km/h on the freeway (it did have extractors + was running a bit rich).

I would not recommend 6.5s on 29's due to high range been to low (ie you will have to rev it hard to sit on 100 km/h)


Ok what reduction would be best for me, I do wanna go bigger tyres later on when my tyres get bald
Author:  Ridge [ Mon Apr 19, 2010 3:20 pm ]
Post subject:  Re: sierra reduction gears
I have 4.9 transfer gears and have 235s it revs hard on road but the low range crawl is great. I could go to a 31" tyre and the gearing in high range would be almost back to stock and the low would still be pretty good.
Author:  zooky08 [ Mon Apr 19, 2010 3:34 pm ]
Post subject:  Re: sierra reduction gears
Ridge wrote:
I have 4.9 transfer gears and have 235s it revs hard on road but the low range crawl is great. I could go to a 31" tyre and the gearing in high range would be almost back to stock and the low would still be pretty good.


How much are 4.9s, I only wanna spend maby 500 to 800
Author:  BlueSuzy [ Mon Apr 19, 2010 3:41 pm ]
Post subject:  Re: sierra reduction gears
http://www.lowrangeoffroad.com/index.ph ... gears.html

$525 usd = $567.20 aud

+ postage whatever that is now. Used to be $120 usd.
Author:  zooky08 [ Mon Apr 19, 2010 4:30 pm ]
Post subject:  Re: sierra reduction gears
BlueSuzy wrote:
http://www.lowrangeoffroad.com/index.php/suzuki/samurai/transfer-case/4-9-1-tcase-gears.html

$525 usd = $567.20 aud

+ postage whatever that is now. Used to be $120 usd.


So u just send ova $527 + postage

Sorry I don't really buy stuff from overseas
Author:  Ben_Sierra [ Mon Apr 19, 2010 4:32 pm ]
Post subject:  Re: sierra reduction gears
Go to the webiste, decide what you want, put in your credit card number, they send the gear. Its that simple.
Author:  lump_a_charcoal [ Mon Apr 19, 2010 4:36 pm ]
Post subject:  Re: sierra reduction gears
Someone was selling a Tcase with 6.5s on here for $800 - Get them.
Author:  zooky08 [ Mon Apr 19, 2010 4:39 pm ]
Post subject:  Re: sierra reduction gears
Ben_Sierra wrote:
Go to the webiste, decide what you want, put in your credit card number, they send the gear. Its that simple.


Yea I no how to that just not the currency shit, and my parents don't like using there credit card ova the net, and im to young for a credit card. Ill con my parents into it :wink:
Author:  Rusho [ Mon Apr 19, 2010 4:40 pm ]
Post subject:  Re: sierra reduction gears
lump_a_charcoal wrote:
Someone was selling a Tcase with 6.5s on here for $800 - Get them.


31zook I think, but it's sold :cry:
Author:  lump_a_charcoal [ Mon Apr 19, 2010 4:42 pm ]
Post subject:  Re: sierra reduction gears
zooky08 wrote:
Ben_Sierra wrote:
Go to the webiste, decide what you want, put in your credit card number, they send the gear. Its that simple.


Yea I no how to that just not the currency shit, and my parents don't like using there credit card ova the net, and im to young for a credit card. Ill con my parents into it :wink:


Get them from Locktup, in WA then.

Tell them you are just a kid, they might look after you.
Author:  Ben_Sierra [ Mon Apr 19, 2010 4:46 pm ]
Post subject:  Re: sierra reduction gears
The credit card company will do all the conversions themselves, as long as you are aware of roughly what it will cost in AUD so you know what sorta hit your gonna take.

Rates are currently around 92USc to 1 AUD, but you'll probably only get around 90c on your credit card...
Author:  zooky08 [ Mon Apr 19, 2010 6:04 pm ]
Post subject:  Re: sierra reduction gears
lump_a_charcoal wrote:
zooky08 wrote:
Ben_Sierra wrote:
Go to the webiste, decide what you want, put in your credit card number, they send the gear. Its that simple.


Yea I no how to that just not the currency shit, and my parents don't like using there credit card ova the net, and im to young for a credit card. Ill con my parents into it :wink:


Get them from Locktup, in WA then.

Tell them you are just a kid, they might look after you.



I wanna get them from lockup4x4, but they don't have the 4.9. They have the 6.5s for 699 I think. thats that's why I asked would they be aright for my car
Author:  BlueSuzy [ Mon Apr 19, 2010 6:07 pm ]
Post subject:  Re: sierra reduction gears
Ring locktup.

They will be able to get them

They are just an Aus to Usa middle man reseller.
Author:  lump_a_charcoal [ Mon Apr 19, 2010 6:08 pm ]
Post subject:  Re: sierra reduction gears
6.5s have a lifetime warranty.
4.9s don't.

Your call...
Author:  BlueSuzy [ Mon Apr 19, 2010 6:10 pm ]
Post subject:  Re: sierra reduction gears
lump_a_charcoal wrote:
6.5s have a lifetime warranty.
4.9s don't.

Mum's call...
Author:  zooky08 [ Mon Apr 19, 2010 6:28 pm ]
Post subject:  Re: sierra reduction gears
BlueSuzy wrote:
lump_a_charcoal wrote:
6.5s have a lifetime warranty.
4.9s don't.

Mum's call...



Actually its my call
Ill get mum to buy it but Ill be paying my mum back

4.9s or 6.5s? Hard one
6.5s will be better in the long run as ill be getting bigger tyres, correct me if im rong
Author:  BlueSuzy [ Mon Apr 19, 2010 6:32 pm ]
Post subject:  Re: sierra reduction gears
:rofl:

Better in the long run, Depending on what state and how legal you want it via tyre size..

If you get 4.9's now, You can always change diff ratio's after to get a better high ratio for larger tyres.
Author:  zooky08 [ Mon Apr 19, 2010 6:49 pm ]
Post subject:  Re: sierra reduction gears
BlueSuzy wrote:
:rofl:

Better in the long run, Depending on what state and how legal you want it via tyre size..

If you get 4.9's now, You can always change diff ratio's after to get a better high ratio for larger tyres.



true about that, I live in qld. I think im only aloud 30 inch tyres right :?

Diff gears? Yes im made of money haha
Author:  Ben_Sierra [ Mon Apr 19, 2010 8:54 pm ]
Post subject:  Re: sierra reduction gears
30's? In QLD? :rofl:

Dream on...
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