Notice: We request that you don't just set up a new account at this time if you are a previous user.
If you used to be one of our moderators, please feel free to reach out to Chris via the facebook Outerlimits4x4 group and he will get you set back up with access should he need you.
Recovery:If you cannot access your old email address and don't remember your password, please click here to log a change of email address so you can do a password reset.

37s and diff ratios

Tech Talk for Nissan owners.

Moderators: toaddog, V8Patrol

Forum rules
Post Reply
Posts: 150
Joined: Sun Jan 20, 2008 9:06 pm
Location: swan valley

37s and diff ratios

Post by uzdnabuzd »

My question is..... I have a 150rwkw td42 on 35's with 4.11 diff ratios. I have recently ordered a set of 37s for play tyres. Do you think i will need to do my ratios ie go to 4.6, or do you think i will get away with it.
I know the obvious is bolt em up and see how i go but there must be lots of people out there running 37s with or without ratios to tell me there opinion.

Cheers
Top
Posts: 478
Joined: Tue Jul 18, 2006 8:43 pm
Location: outer east Melb.

Contact:
Contact MUD EMPIRE

Post by MUD EMPIRE »

I run 37 Treps with carby GQ and 4.6's......it's OK but still lacks on steep '2nd low' hills.
A friend of mine has a 4.5 petrol GU with the same tyres and 4.1's and he has no problems turning the rubber with the extra power.........
I'd hazard a guess that with 150 Kw you should be OK with 4.1's.
The only down side may be, wheel speed compared to winch speed......ie. when you're winching you'll be turning the tyres faster than the winch will pull the car.......4.6's won't fix this but it would be heaps better.

So.........if you can afford the change to 4.6 ratios......do it......

Dave
Top
Posts: 1308
Joined: Tue Sep 23, 2003 10:17 pm
Location: BADFABING

Post by turbo gu »

i have 37 krawlers on my GU 4.2td ute with 4.1 diff gears but i have crawler gears in the transfer and that seems fine. It only has a 3inch exhaust no other upgrades yet and with that i wouldn't want to be pulling much weight in high range as take off is a bit flat until therevs get up a bit
GU 42td wagon for touring
GU ute for the fun stuff
http://www.allterrain4wd.org.au/
Top
Posts: 150
Joined: Sun Jan 20, 2008 9:06 pm
Location: swan valley

Post by uzdnabuzd »

Cheers guys.

keep the opinions coming.

Thanks
Top
Posts: 4275
Joined: Fri Nov 22, 2002 6:41 pm
Location: Western Australia

Post by Hoonz »

i had a similar set up to you
4.1 gears with turbo diesel was sweet on road with 35s
but i had crawler gears 85% ones ... i will prolly go the 43% this time round

so if 37s are only play tyres get some crawler gears to suit your style of driving

24%
43%
85%


http://www.marks4wd.com/products/gearma ... -gears.htm
H( * )( * )NZ loves B( * )( * )BIES
if a fat lady falls in the forest do the trees laugh?
[quote="RUFF"]although i didnt mean to, i squealed like a girl :armsup:[/quote]
Top
Posts: 4607
Joined: Sun Oct 22, 2006 8:11 pm
Location: yallourn north,victoria

Post by tna racing »

200kw + 37's with 4.625 is a good match :cool:
1993 Gq lwb with added xtra's :) sold
fj60,lifted,35s,33s for daily, 3f power!
Top
Posts: 5462
Joined: Fri Dec 20, 2002 1:29 pm
Location: Boomba

Post by WICKED »

I think you'll be fine.

Just wait and see what you think.
Buds Customs : Street, Track & Trail - Parts & Fabrication - Nissan, Toyota, Custom D60 gear
http://www.facebook.com/budscustoms
Top
Posts: 263
Joined: Thu Mar 06, 2003 7:55 pm
Location: Bayswater

Post by Fathillbilly »

i used to run 4.6's with 36" and i found it over geared i changed it to 4.3's and it was awsome :twisted:
[quote="COOP"] By the way Mr engineering Guru maybe you better get another calculator or learn how to use it![/quote]
www.indurooffroad.com
44mm and 38mm Roll Cage Tube
Eibach Springs SAW Shocks
Top
Posts: 150
Joined: Sun Jan 20, 2008 9:06 pm
Location: swan valley

Post by uzdnabuzd »

Hoonz wrote:i had a similar set up to you
4.1 gears with turbo diesel was sweet on road with 35s
but i had crawler gears 85% ones ... i will prolly go the 43% this time round

so if 37s are only play tyres get some crawler gears to suit your style of driving

24%
43%
85%


http://www.marks4wd.com/products/gearma ... -gears.htm

yeah got 35's at the moment and it is fine offroad, just heard that 37 treps make a massive difference. I know someone that had 36 simexs went to the treps and said it was a huge difference.
Top
Posts: 150
Joined: Sun Jan 20, 2008 9:06 pm
Location: swan valley

Post by uzdnabuzd »

MUD EMPIRE wrote:I run 37 Treps with carby GQ and 4.6's......it's OK but still lacks on steep '2nd low' hills.
A friend of mine has a 4.5 petrol GU with the same tyres and 4.1's and he has no problems turning the rubber with the extra power.........
I'd hazard a guess that with 150 Kw you should be OK with 4.1's.
The only down side may be, wheel speed compared to winch speed......ie. when you're winching you'll be turning the tyres faster than the winch will pull the car.......4.6's won't fix this but it would be heaps better.

So.........if you can afford the change to 4.6 ratios......do it......

Dave
The problem is trying to get a set. They are like rocking horse sh@#. and from what i have heard if you can get them they demand big bucks

Cheers

Zac
Top
Posts: 45681
Joined: Wed Nov 27, 2002 10:13 am

Post by bogged »

uzdnabuzd wrote:The problem is trying to get a set.
what of 4.6's??

rare??
Top
Posts: 4607
Joined: Sun Oct 22, 2006 8:11 pm
Location: yallourn north,victoria

Post by tna racing »

bogged wrote:
uzdnabuzd wrote:The problem is trying to get a set.
what of 4.6's??

rare??
don kyatts sell them, they seem great too :armsup:
1993 Gq lwb with added xtra's :) sold
fj60,lifted,35s,33s for daily, 3f power!
Top
Posts: 845
Joined: Sun Dec 17, 2006 8:28 pm
Location: Bairnsdale, East Gippsland

Post by jet-6 »

BBM sell them, best prices about!
Top
Posts: 1047
Joined: Sun Nov 19, 2006 2:27 pm
Location: Wollongong

Post by Nelso »

Mine is a 4.2 diesel with a basic turbo and 3 inch exhaust and puts out less power than yours but is fine with 4.11 diff gears and 37s. It does have 83% transfer gears, otherwise it would be terrible offroad. Ideally it would be better with 4.6 diff ratios but its good enough the way it is.
What's the difference between ignorance and apathy? I don't know and I don't care.

I am an insomniac dyslexic agnostic. I often lay awake all night wondering if there really is a Dog.
Top
Posts: 150
Joined: Sun Jan 20, 2008 9:06 pm
Location: swan valley

Post by uzdnabuzd »

Yeah i dont have reduction gears in the transfer. Is 83% reduction 83% reduction in gearing or 83% of the original speed (17% reduction for std)

Yes 4.6 ratios are rare as i am a fussy f@##er and if i was going to run i would want genuine. Not keen on aftermarket gears.

Cheers
Top
Posts: 4
Joined: Sun Oct 28, 2007 12:34 pm
Location: blue mountains

Post by diffin out »

I have a GQ tb4.2 efi and i am now running 38in swampers and 4.8 ratios and i still think im a bit slow off the mark and struggle holding speed
in fifth gear on any sort of incline on road of coarse.

But i run 83% reduction gear seems to be plenty slow enough off road.
Top
Posts: 150
Joined: Sun Jan 20, 2008 9:06 pm
Location: swan valley

Post by uzdnabuzd »

Well i think i have decided on reduction gears.........

Now who has the best ones to get?? Do they weaken the transfer.

I am thinking 24% or 43% not sure on that yet. Not big on the real slow stuff.


Cheers
Top
Posts: 45681
Joined: Wed Nov 27, 2002 10:13 am

Post by bogged »

uzdnabuzd wrote:Yes 4.6 ratios are rare as i am a fussy f@##er and if i was going to run i would want genuine.
Try Blackburn Nissan, they usually have them on the shelf.
Theres a few of their staff on this board.
http://www.outerlimits4x4.com/sutra1464568.php#1464568
Top
Post Reply

Return to “Nissan”

Who is online

Users browsing this forum: No registered users and 0 guests