diff changeover

Gudday Phil,
Plan on doing a lot more hwy k's travelling soon, so just to bring the revs down and improve economy

Charlidees, if you are still running the the NA 1HZ you are very unlikely to save any fuel, might even increase consumption as it will then be out of its torque band and will need more "foot" to maintain speed.
Years ago a friend and I tried all sorts of different diff and tyre combo's (very early cruisers had 3. something diffs and tires are an easy way to change the gearing, right up to 900x 16). After a fair bit of "testing" we came to the conclusion that 4.11 with standard 7.50 x 16 in a road pattern was pretty close to ideal especially if loaded. Increasing overall tyre diameter and width used more fuel as did a more aggressive tread pattern.
So good old Toyota wasn't far off the mark with standard 7.50 x 16's.

I agree 100% with Peter, which is why I asked the question.

As a general question Phil did toyota change the internal gearing in the gearbox or transfer case or both, seeing as the 79's now run lower ratio diffs. Aren't they 4.3 or something now?

Gday Peter,
The 4.300 diffs are only found behind the 1Hz motor and the small R151F gearbox.
The 4.100 diffs are found behind the factory TDs with H150F gearbox.
The 4.111 diffs are found in the 60/75/80 series.

FactoryTD 1HD-FTE: HDJ78/79 with H150F gearbox:
1st: 4.529
2nd: 2.464
3rd: 1.490
4th: 1.0
5th: 0.811
Transfer: 2.488
Diffs: 4.100

N/A Diesel 1Hz: HZJ78/79/105 with R151F gearbox:
1st: 4.313
2nd: 2.330
3rd: 1.436
4th: 1.0
5th: 0.838
Transfer: 2.295
Diff 4.300

60/61/75 series with H55F gearbox:
1st: 4.843
2nd: 2.618
3rd: 1.516
4th: 1.000
5th: 0.845
Transfer: 1.963
Diffs: 4.111

80series. 1Hz had H150F box with 2.488 transfer and 4.111 diffs

80series 1HD-T and 1FZ-FE had H151F box, 2.488 transfer and 4.111 diffs:
1st 4.081
2nd 2.294
3rd 1.49
4th 1.0
5th 0.881

Hey Phil you don't work for toyota do you? ;-)))
Nah they wouldn't be able to supply that sort of info to a prospective customer.

Toyota wouldn't pay me enough :-))
Its not hard to read off some spec sheets I've collected over the years!

I don`t remember my manual gearbox name (H55 or not) but:
I had diffs 3,6. As for Old models you could find diffs with: 5,14; 5,28 and 6