Question on FWH



Sorry Julian, I have not use the thread title, but life is never so
easy out here to keep all messages.
So FWH, remember mine is a part time 4WD, and after reading all this
stuff about busted Birfields am I glad I go almost everywhere in 2WD !
My Brum motor spares birfields are still hanging in there after 4
years and quite a few slippery winters in 4WD.
I don't get the remark that the 80 rear diff must be weak. Remember
that a 'permanent 4WD' 80 is running on the rear diff nearly all the
time in dry (not slippery) tarmac conditions and rarely in 4WD. Come
to think of it, it has to be a pretty rough gravel road before the
wheels slip, thanks to the weight of the 80. So no one should
underestimate the strength of the rear diff, or any drivetrain
component made by Toyota come to think of it.
My FWH are the standard Aisin and as far as I can remember all
the part-time 4WD 80's and 75's I see in my work have them fitted as
standard. We have always instructed staff to keep them in 2WD unless
they need it, it saves drivetrain wear that way.
As for reducing fuel consumption then I thoroughly endorse that
theory. With a part time 4WD, when the hubs are in gear then there is
a lot of machinery turning over from hub to transfer case output
shaft for no reason. FWH are a good idea for that alone.
As for fitting them, they just replace the standard Toyota cap which
is not a difficult task at all. One becomes very familiar with them
when removing hubs for other maintenance and overhaul work. Just
remember to have a brass drift for the cone washers. But if you
remove the hub on the odd occasion even they don't really get seized
into the taper.
Sorry I can't pass much info on the full time 4WD set-up.
Belgrade, Serbia and Linslade, Beds
'92 HZJ80 ex U N Bosnia surplus - does anyone know anything about the
Skoda Roomster?


toyj80 wrote:
Don't know if you are referring to the story about my friend busting his
rear-diff when in 2wd. if you are ;) what I meant by the story is not
that the rear-diff is weak, but that when you are driving in 2wd all the
energy the engine produces go through the rear-diff and not both the
front- and rear-diff.. Again I'm no Scientist, but I my book that puts
more strain on the rear-diff?? .. I'm not saying that the rear-diff
normally can't take it, but my friends couldn't..
Michael Thorsager, Denmark,
1997 VX80, 2.5" OME (and some other stuff)


Not many diffs around are as stong as a Toyota but don't forget the Land
Cruiser is a heavy vehicle with power, big clutch, low gears, incredible
amount of torque and because of the good traction wheel spin is unlikely so
something has to give. (Rear diff was probably locked or limited slip as
I would be surprised if reving the engine and dropping the clutch while in 4
wheel drive low ratio and with locked diffs didn't caused damage somewhere.
Malcolm Bagley
Stafford UK
FJ45 '75 & FJ45 '76
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