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change ratios from 4.6 to 4.3 running 35's

Tech Talk for Nissan owners.

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change ratios from 4.6 to 4.3 running 35's

Post by morkz »

Hey i just want some advice on people with gq/gu turbo diesel out there.

I have fitted 4.6 ratios to my GU and around town they are great in the fine, but what the suck on the open highway at 130 they sit on 3000rpm.

I know you can say reduce speed and yes i probably should but i just find that it revs to hard.

is it worth going to 4.3 or not bother it's only going to drop 200 rpm i think. i have been offered a set low kms for a straight swap only going to cost me new bearings so am not sure what does everyone think.
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Post by jtraf »

my understanding is 300rpm for every jump in ratio....

stay with the 4.6 if you don't do a great deal of hyw driving.....
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Post by morkz »

yeah my problem is i do a bit of hwy driving and its driving me nuts next years am thinking of going to the cape so am not sure what to do.
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Post by hottiemonster »

i know someone who will swap your 4.6s for 4.3s, pm bundyrum4x4 off the board.
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Post by ludacris »

I am still running the 3.9's with 36's and dont have a problem on or offroad. Go the 4.3's and ask for a cash adjustment for new bearings.

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Post by morkz »

not sure yet have already been offered the 4.3 just not sure weather to swap !

why is everyone wanting the 4.6?
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Post by krimnl »

I have 4.3's in my GU with a 4.2TD the speedo is 100% spot on.
revs are good at 100ks
i think they are the perfect ratio for the 4.2
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Post by morkz »

krimnl wrote:I have 4.3's in my GU with a 4.2TD the speedo is 100% spot on.
revs are good at 100ks
i think they are the perfect ratio for the 4.2
thanks mate thats what am after.

i've seen your around town does it drive ok i.e. gear changes arent to bad?

with the speedo corretion does this mean that 4.6 over correct?
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Post by kc_ksom »

I went from 4.6 to 4.3 and also added 35s (from 31). really in the jist of it all, the difference is minimal, but I have the grunt to turn it. The speedo is out to buggery, probably 15km, but the difference I was looking for at 110km per hour wasnt enough, the engine is still doing around 2800, wich in my opinion is still to high.... this is in an MQ...

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Post by Hoonz »

i run stocko 4.1 ratios in my ute with 35z and its sweet
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Post by Josh_GQ »

Yah i reckon if you do a bit of driving on the road having slightly taller gears is good. keeps the revs down a bit and the 4.2's have enough torque to do it happily
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Post by morkz »

yeah i'll probably look at going 4.3

a few people have pm'd me wanting to swap
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Post by JemmyBubbles »

Am I the only one that thinks going 37's is the obivous answer ??
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Post by bazzle »

I ran 4.375's in both my Mavs with 35's. Red mav was IC turbo diesel. Very well suited.
On gq speedo gears available to correct error if required.

2250 rpm's at 100kph.

bazzle
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