27", rims, tyres, lift and scrubbage:)

2coupedup · Post by **2coupedup** » Sun Aug 10, 2008 10:50 am

i would love a good crawl ratio for low range, would make hills and rutts way easier to handle instead of having to grit your teeth and gun it or ride the cluth lol...

Subafury · Post by **Subafury** » Sun Aug 10, 2008 11:48 am

whatcharterboat wrote:Sorry Brumbyrunner. Just everything I read said that you had to lift to fit 27"s. You're the first person I've read that's actually said "Sure you can fit em". I can see the obvious advantages of "lift" in the bush but don't see the need for it on the beach. Thanks.

you obviously havent done much 4x4 on the sand then. without lift ALL of the chassis will belly out in the deeper ruts slowing you down majorly and dragging- this aint good especially with a carby motor. with lift you would only be dragging a smaller surface area ie diff and control arms.

brumbyrunner · Post by **brumbyrunner** » Sun Aug 10, 2008 12:16 pm

whatcharterboat wrote:Thanks Brumbyrunner.

I have been reading as much as I can in the old threads. Is there a thread on the 26:1 low range? I can't quite imagine it. Would 5th low be similar to 1st or 2nd high. Its really only the low range I need to change. The motor just wont pull in the really deep sand when you're going slow. On the road is OK I suppose

Whoa. It's not a 26:1 low range!
Crawl ratio is calculated by multiplying 1st gear, low range and diff ratio. Therefore 3.636 x 1.592 x 4.444 = 25.724147:1

Now I'm not an expert on your car but I would guess it has a 3.545 1st gear, 1.196 low range and 3.7:1 diff ratio. That would make your crawl ratio around 15.7:1. Check your owners manual for the right ratios.

As a direct comparrison, a new diesel Hilux has a crawl ratio of 40:1 and a new Unimog has 360:1.

whatcharterboat · Post by **whatcharterboat** » Sun Aug 10, 2008 10:54 pm

Thanks once again for the clarity. I see what you mean. I thought the 26:1 figure was a bit out there. I want to find something in the old threads about what is required to change the diff ratios to see if it's something I can actually do my self at work or if I have to send it to a specialty shop. Appreciate your replies.

you obviously havent done much 4x4 on the sand then. without lift ALL of the chassis will belly out in the deeper ruts slowing you down majorly and dragging- this aint good especially with a carby motor. with lift you would only be dragging a smaller surface area ie diff and control arms.

Still not convinced. If the ruts are deep, the front control arms and the front bash plate tend to plough well before the belly does and find the belly never drags (not continuously as you describe anyway). Agreed ploughing is not good for my motor. I also find the Speedy rims with the wide offset sit pretty well in the cruiser/patrol ruts too.

BTW first time I drove a subi in sand was '78. I have some really classic old pics of our 76 model going through the original 1st cutting onto the Noosa North Shore. Next time I'm at the olds house I'll dig em up and post em. That was in the days of the old sand blow before the new Leisha track bypass. If you don't know what I mean it was a huge sand bowl with this mega long dune you had to climb. A real struggle for every thing that tried. You know everyone out pushing and lots of speed. Anyway there was this guy with an original 2 door Leone converted to 4wd who would go down the dune halfway and then reverse up like he was on the bitumen just to show off to the cruisers/patrols/landies. After that I was hooked.