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37s and diff ratios

Tech Talk for Nissan owners.

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Posts: 150
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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
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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
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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
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Post by uzdnabuzd »

Cheers guys.

keep the opinions coming.

Thanks
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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
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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!
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Post by WICKED »

I think you'll be fine.

Just wait and see what you think.
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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:
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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.
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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
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Post by bogged »

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

rare??
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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
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Post by jet-6 »

BBM sell them, best prices about!
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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.
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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
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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.
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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
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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
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