From: Noddy on 21 Oct 2007 02:28
"DAvid" <davideo(a)bigpond.net.au> wrote in message
> I stand by what I said earlier....if it has a 3 sp gearbox with an extra
> low or hi low range...totally different story and no problem.
DAvid, the number of gears in the gearbox is largely irrelevant compared to
the overall drive ratio for the task at hand.
What I mean by that is if you were trying to climb up the side of a mountain
in top gear you'd find things pretty difficult. However, if you were trying
the same thing in a very low gear that gave an excellent torque
multiplication value you'd find things pretty easy. I'm far from an
experienced 4wd'er, but generally when undertaking such tasks you don't
change gear unless the going suddenly becomes very easy and the engine can
handle stepping up to the next ratio. If it doesn't, you stay in the gear
that puts the least amount of strain on the engine, and that's generally the
A lot of early 4wd's had three speed manual boxes. The Jeep certainly did,
early land cruisers, Mitsubishi made some 4wd's in the very early days that
were a direct lift of early Jeeps, etc, and most of them weren't the
slightest bit troubled by the fact that they only had three forward gears.
Where changing from a three speed to a 4 speed (or more) made a big
improvement was not so much over the rough stuff, but for driving around
town at speed in suburbia.
For example, the old army Jeep's three speed gearbox only had synchro on
second and top meaning first gear was a "crash" gear (like a very early
Holden), and that meant it pretty much could only be used to get the thing
moving when you were stationary (unless you wanted to be *really* gross
about things :).
For the rest of the time when you were moving, you only had second and top
gear to play with, and there'd be plenty of occasions where top was too tall
and second wasn't quite tall enough to keep things happy. Especially in a
vehicle with an engine that made a whopping 58 horsepower and generally
didn't like to rev much over 4000rpm.
By moving to more ratios in the box (such as with 4, 5 and 6 speed manuals),
you have more selection available to pick a gear that keeps the engine happy
for the given circumstance.
Of course, a lot of this becomes irrelevant if you have an engine that makes
bags of torque, like a big V8 for example. Generally speaking, the more
torque your engine makes the *less* gears you need in the transmission to
keep it happy.
Which is largely why having a six speed manual (or 7 speed auto) behind
engines that make 500+nm of torque is nothing but a wank.
From: Noddy on 21 Oct 2007 02:33
"Andy" <nospam(a)no.no> wrote in message
> Righteo. Hilarious.
It was lost on me as well :)
From: John McKenzie on 21 Oct 2007 02:58
> "DAvid" <davideo(a)bigpond.net.au> wrote in message
> > They couldn't have been too serious a 4WD vehicle with a 3sp gearbox
> > fitted. Unbelievable! I can imagine there were a few burnt out clutches.
> The original jeep had a three speed gearbox, and as far as four wheel drives
> go they were pretty good :)
Axle seals, and by extension wheel bearings.
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From: Dan--- on 21 Oct 2007 03:08
On Sun, 21 Oct 2007 06:58:22 +0000, John McKenzie PCM code reading says:
> David Z, who knows everything he knows about cars from redbook,
> constantly craps on about some car having 2Nm less torque than another,
> or just a 5 speed auto. what a tool. Considering he can't even drive a
> manual anyway, he'd likely be able to accomplish everything he currently
> does in a car with only a 2 speed auto, without the slightest bit of
> perceivable difference. In fact it'd be a bit of a laugh to steal his
> car (joke of course) and put a glide in it, and tweak the shifter so he
> wouldn't know that it never shifts lower than the second highest gear
> currently available, despite what the tree says (or does he need a light
> on the dashboard to tell him when it's in D, because auto shifters are
> _so_ complicated)
Powerglide wouldn't work in his car it wouldn't have enough torque to spin
the input shaft in the transmission.
The Torque converter itself would make the engine conk out. ;-)
From: Kev on 21 Oct 2007 03:32
I always used 2wd/Lo in my Luxen
even the trubo Runner
when taking off on steep hills with the family and a load of whatever
else it was ride the clutch time
lo range 2nd was the right gear, lift off the clutch and your away
2nd to 4th then a double de-clutch into hi and a flip back to 3rd gear
works a treat
just takes a bit of trial and error to find the right combination