Changing Gearing to 4:88s with 35s - any advice?

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mattiew82
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Changing Gearing to 4:88s with 35s - any advice?

Unread post by mattiew82 » March 27th, 2018, 12:19 am

Hi,
I have a turbo'd 105 series cruiser on 35s, part time kit installed, and have been contemplating re-gearing to 4:88s for some time, particularly since I'm starting to do more towing. About to throw a locker in front end so now is the time.
Have read through old threads, but couldn't find anything on this:

Has anyone had any issues post install, eg - whining noises at highway speeds, or any diff noises, or general problems?
I know a lot of people switch out their diff gears, but I was advised against it by a mechanic - I cant see why there'd be a problem.
I'm not really lacking any power, and my EGTs are really good, but hey, why not get the most out of your vehicle and reduce stress on your engine/driveline.

I'm in northern NSW so any advice on the right people to do this and anyone who's running this with no issues would be greatly appreciated.

cheers!

Matt

Peter Aawen
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Re: Changing Gearing to 4:88s with 35s - any advice?

Unread post by Peter Aawen » March 27th, 2018, 8:41 am

Hey Matt, welcome to the Forum & your first post! But I gotta say, if you are doing 'more towing' these days, then you'd REALLY be doing yourself a favour by fitting a Detroit Locker into the rear diff instead of just locking the front when you are changing gears all around - why wouldn't you want to get the traction advantages ALL the time, improve your on & off road towing ability, get a much stronger diff centre into the bargain?? And you can get that all without any more impact on your on-road driving than you'd get from having an LSD back there that works (if your Toyota LSD is much more than about 40,000km old, chances are it's doing very little if anything in the way of 'slip limiting'!!) The guys at Locked Drive Systems in Holroyd, Sydney should be able to help with the Detroit Locker AND the do front & rear gearing change at the same time if you want! Opposite Lock also supply & fit the Detroits & gear sets, but they often aren't as knowledgeable about them or the best way to improve your traction, towing, wet weather driving, etc as the guys at LDS are, who ONLY do diffs, gearing, & Lockers! ;)

Done properly, with the diff gears set up correctly, you shouldn't have ANY problems or noises afterwards - swap the diff gears for another set & do the back-lash & pre-load set-up properly & the ONLY real difference will be the gearing - why would there be any problem with that?? I'd suggest that unless that mechanic who suggested against it had some other valid reason for doing so, it might be smart never to let him near your vehicle again (or at all!!) cos he's obviously got NFI about this sort of thing - many have done it without ANY issues, but the trick is to get the carrier/diff internals set up properly & if you've only done it or are just doing it the once, it might pay to go to someone like the mob at Locked Drive Systems or any other diff specialist & let them do that bit even if you do all the rest - they've probably done millions & besides, they warrant their work! ;)

Enjoy!
An Ex-Service person is someone who thought enough about their country & how great it is, how lucky we are to live here, to write a blank cheque made out to 'The People and Commonwealth of Australia' for the value of 'Up to & including my Life!'

mattiew82
I'm new, be nice!
Posts: 2
Joined: March 25th, 2018, 5:23 pm

Re: Changing Gearing to 4:88s with 35s - any advice?

Unread post by mattiew82 » March 28th, 2018, 8:43 am

Thanks for your input, Peter.
I might just go ARB locker in the rear too. I was pleased with them on my last vehicle.

As for gearing, i never me that mechanic. That info was just passed on through the people that priced it. I thought it was really strange that he'd had a bad experience with the install. Possibly he doesn't specialise in diffs/gearing etc, but no point in arguing.

ARB on the gold coast will do gearing install while they're installing lockers, so thats the closest to me.

Cheers!

Peter Aawen
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Posts: 20815
Joined: June 17th, 2005, 8:01 pm

Re: Changing Gearing to 4:88s with 35s - any advice?

Unread post by Peter Aawen » March 28th, 2018, 8:52 am

Just be aware that you'll miss out on most of the advantages of a locker by going with an Air Locker or any other manual locker - they are only going to be helpful off road, & even then they will adversely impact your steering ability to some degree... while a good auto locker just works for you ALL the time, on & off road; and these days, the latest Detroits have no more impact on your steering or driving anywhere than a good quality LSD would have, but you get significantly better traction & 'drive delivery' ALL the time! Plus you get a massively stronger diff centre than the stock unit into the bargain, all for about the same price too! ;)
An Ex-Service person is someone who thought enough about their country & how great it is, how lucky we are to live here, to write a blank cheque made out to 'The People and Commonwealth of Australia' for the value of 'Up to & including my Life!'

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