33's vs diff ratio change?

zepplin · Post by **zepplin** » Sun Apr 22, 2012 10:44 pm

To the boffins out there - what will give me a lower ratio, 33's or change diff ratios to x? Currently my Lux with the 5VZ is running 31's with 4.88 diffs and sitting at 3200rpm at 110 but want to bring the revs down a bit, preferably around 2800@110.

Post by **Mud Dog** » Mon Apr 23, 2012 12:47 am

You already have a suspension upgrade so that should give you enough clearance for 33's ..... and you've already done the axle shift too. Rather leave the diffs as they are ..... the bigger wheels will give you more benefit off-road and it's cheaper than replacing both diffs. The 33's will help but I don't think they'll bring the revs down too much though.

Boland4x4 · Post by **Boland4x4** » Mon Apr 23, 2012 12:36 pm

3200*31/33 = 3006 rpm. The diff ratio you would need is 2800/3200*4.88 = 4.27 or closest.
I agree about going to 33's, they just look better.

PS : 33" muds + 4.55 ratios will give you 2802 rpm

Stubs · Post by **Stubs** » Mon Apr 23, 2012 12:42 pm

i get 2800 rpm and 110km, running 33" bridge M/T's. but then again I am running a ford V6 which you hate

....but my diffs are standard....just my 5 cents worth :shifty:

zepplin · Post by **zepplin** » Mon Apr 23, 2012 3:42 pm

Boland4x4 wrote: 33" muds + 4.55 ratios will give you 2802 rpm

Thanks Jano. What revs will 33's & 4.88 get me to?

Stubs wrote:.but my diffs are standard

Stu, I think you might have 4.55 diffs in that older model of yours. How is it running anyhow?

Hoppy · Post by **Hoppy** » Mon Apr 23, 2012 5:09 pm

The 2.8d's was the only SFA's that had 4.55 ratios, all the other SFA's from '79 to '99 were 4.875

If you have import difs, there is complete 4.3 centres available for about R4000 brand new each

Boland4x4 · Post by **Boland4x4** » Mon Apr 23, 2012 5:12 pm

"Thanks Jano. What revs will 33's & 4.88 get me to?" ....... ..."3200*31/33 = 3006 rpm"

zepplin · Post by **zepplin** » Mon Apr 23, 2012 5:27 pm

Stubs · Post by **Stubs** » Tue Apr 24, 2012 7:47 am

zepplin wrote:
Boland4x4 wrote: 33" muds + 4.55 ratios will give you 2802 rpm
Thanks Jano. What revs will 33's & 4.88 get me to?

Stubs wrote:.but my diffs are standard
Stu, I think you might have 4.55 diffs in that older model of yours. How is it running anyhow?

its running excellent, am well pleased.... plenty of extra power over the 4y I had

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33's vs diff ratio change?

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