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4.88 diff gears needed for 37s?
Posted: Thu Oct 13, 2011 3:51 pm
by MEANRX
Going to be running 37s on my fj45 with 60 series diffs and 5 speed. Will i need to change from 4.11 to 4.88 gears? its not running yet so cant test on the road with the 4.1s. Im putting lockers and chromo axles in and would like to fit 4.88s at the same time if needed. Only worried about gearing for on road as will be regularly driven and doesnt matter if i keep 4.1s so much offroad as im looking at fitting a marlin crawl box. Cheers.
Re: 4.88 diff gears needed for 37s?
Posted: Thu Oct 13, 2011 7:45 pm
by 91Mav
You'll want either 4.56's or 4.88's. I ran 35's on 4.1's for a while and while it's not too bad, it's not at all good. Are you running reduction gears as well?
Re: 4.88 diff gears needed for 37s?
Posted: Thu Oct 13, 2011 8:03 pm
by MEANRX
No reduction gears mate. Will have to wait for the dollar to come back up a bit then so I can order diff tears from the
states. Im' running an ls1 if that makes any difference. Cheers.
Re: 4.88 diff gears needed for 37s?
Posted: Thu Oct 13, 2011 8:43 pm
by dogbreath_48
As 91mav said it's ok but not great. I'm currently running 37's and 4.11 (my 4.56 diff shat itself) and whilst the car gets along quite well on the road it's far from ideal. (turbo HJ75)
Re: 4.88 diff gears needed for 37s?
Posted: Thu Oct 13, 2011 9:18 pm
by old lux
Yer man I agree with mav91 it's worth swapping over. I am going to run 37s with 5.29 but it's not a daily. With 4.11 and 37s you won't have much crawling cause you'll
Always be revving to keep it crawling so won't really be much low range
Re: 4.88 diff gears needed for 37s?
Posted: Thu Oct 13, 2011 10:30 pm
by dogbreath_48
*should have mentioned, I'd recommend 4.56's, especially with the ls1 and crawler box.
Re: 4.88 diff gears needed for 37s?
Posted: Fri Oct 14, 2011 8:27 am
by hulsty
I'd probably go 4.56, I daily drive on 35''s with 4.1's and its great I wouldnt want any different gearing, though it helps having ~500Nm torque.
Re: 4.88 diff gears needed for 37s?
Posted: Fri Oct 14, 2011 9:45 am
by coilylux
be prepared to change diff's!!!!!
4.88 and 4.56 diff's have the same pinnon, and thats the weak link..
Re: 4.88 diff gears needed for 37s?
Posted: Fri Oct 14, 2011 10:26 am
by MEANRX
coilylux wrote:be prepared to change diff's!!!!!
4.88 and 4.56 diff's have the same pinnon, and thats the weak link..
change to what? do you mean swap diffs for something else or the centre cause i will blow them up?
Re: 4.88 diff gears needed for 37s?
Posted: Fri Oct 14, 2011 10:49 pm
by MENTAL4x4
MEANRX wrote:coilylux wrote:be prepared to change diff's!!!!!
4.88 and 4.56 diff's have the same pinnon, and thats the weak link..
change to what? do you mean swap diffs for something else or the centre cause i will blow them up?
all the centres are the same 40 45 60 75 80 i run 37s daily and 4.88 in a 80 series
Re: 4.88 diff gears needed for 37s?
Posted: Fri Oct 14, 2011 11:37 pm
by sloshy
Transfer gears are a cheaper option than changing the diff gears.
I run 4.11's with duel cases and 40's off road with no probs.
Re: 4.88 diff gears needed for 37s?
Posted: Mon Oct 17, 2011 12:15 pm
by vk7ybi
I did the sums.. 4.11s and 31s is 0.5% different to 4.88s and 37s..