HZJ77 & HZJ73 Manual Transmissions (1 Viewer)
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crushers
post ho
how many km?
crushers
post ho
wow!!
that is pretty sad...
i have had a couple beat to crap ex=mine trucks and they didn't look like that... interesting.
that is pretty sad...
i have had a couple beat to crap ex=mine trucks and they didn't look like that... interesting.
crushers
post ho
sorry supposed to read :343:
Ah, now that makes sense 
The 78/79 and 105 series often have a harder life than most cruisers.
Multiple drivers,long distances, dirt roads at speed,all take their toll.
Its not just the splines on the split shaft,its the shaft trying to separate and the synchoes that go.
I know a guy who owns a business that rebuilds 10-20 landcruiser boxes a week for other shops, miners, and his own customers and thats what he told me.
He says the R151 is just too small behind a 1HZ that is working hard.
The box is probably ok for a privately owned daily driver that gets an easy life.
Toyota introduced it to lower the fuel consumption and emissions figures
crushers
post ho
I would say less drive train losses rhrough the drive train and lower vehicle weight, better shift feel (apprently) and less $$$ to spend = more profit.
They really dont seem to last to well in the 78/79 and 105's. My mates dad has a 1HZ 105 series as a tourer and the box grenaded itself.
Lost 3rd and 4th gear, gear stick changes in but when the clutch is let out, nothing happens, there was no bang or noise, the box was fine, syncros worked well, so he was left with 1,2 and 5th
Toyota have new boxes on the shelf for a quick repair!
They really dont seem to last to well in the 78/79 and 105's. My mates dad has a 1HZ 105 series as a tourer and the box grenaded itself.
Lost 3rd and 4th gear, gear stick changes in but when the clutch is let out, nothing happens, there was no bang or noise, the box was fine, syncros worked well, so he was left with 1,2 and 5th
Toyota have new boxes on the shelf for a quick repair!
The smaller R151 is lighter and has less friction which equals less fuel and less emissions.
The fuel consumption difference between a HJZ79 and 75 is 1 or 2%
I used to have some govt figures around here but my hard drive died last week and what I saved is in a jumble
They also had the smaller front diff
A 100000 is at the lower end. Most seem to go around 150000
Probably already been replaced
crushers
post ho
0.838 R151 O/D ratio
0.881 H150 O/D ratio
0.845 H55F O/D ratio
(add to this the 79 had 4.30 diff gears and the 75 had 4.11)
that is where any fuel savings will come from. not from the 50 lbs of weight savings.
not sure where you get the idea of less friction, you have shafts rolling on bearings, when assembled you have the same friction coming out the output shaft between all 3 trannies.
after 1990 all the land cruisers had the smaller diffs.
Rosco, i think if we ever sat down and had a beer or a pop together it would be an educational and interesting evening for both of us.
0.881 H150 O/D ratio
0.845 H55F O/D ratio
(add to this the 79 had 4.30 diff gears and the 75 had 4.11)
that is where any fuel savings will come from. not from the 50 lbs of weight savings.
not sure where you get the idea of less friction, you have shafts rolling on bearings, when assembled you have the same friction coming out the output shaft between all 3 trannies.
after 1990 all the land cruisers had the smaller diffs.
Rosco, i think if we ever sat down and had a beer or a pop together it would be an educational and interesting evening for both of us.
The R151F was made for/by other manufacturers as well, under different model codes, as well as having gears that are compatible with other Toyota gearboxes, which offers some interesting alternative gear ratio options for the R151F.
Did the same happen with the H150F, are there other boxes with compatible gearsets, by Toyota or other manufacturers, that might give alternative ratios to standard?
Did the same happen with the H150F, are there other boxes with compatible gearsets, by Toyota or other manufacturers, that might give alternative ratios to standard?
You have tested them for resistance? I got the info off a head mechanic at a dealer. Smaller bearings have less friction,but dont last as long.
I also think the r151 has about 2 litres of oil less than the H55F.Oil is also a big factor in resistance
R151
This is a very common prob now days . After 2002 they went to a single peice shaft that doesnt seem to have the trouble as the two peice one . The ones i have seen that failed were allways at the small spline .
The transfe drive spline is still the same from H41 days and still has the wear issue from years ago but never gets a chance to strip as the small one lets go first.
Dave
This is a very common prob now days . After 2002 they went to a single peice shaft that doesnt seem to have the trouble as the two peice one . The ones i have seen that failed were allways at the small spline .
The transfe drive spline is still the same from H41 days and still has the wear issue from years ago but never gets a chance to strip as the small one lets go first.
Dave
crushers
post ho
Dave, expand on your experience...
i am interested.
i am interested.
crushers
post ho
from the burn marks on the output shaft i suspect there is another issue causing this...
