Diff and gearbox ratios

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Macaco
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Fri Aug 07, 2015 9:03 am

More manne..

I hope someone can help me with advice pls, I have a problem with my ratios, at 120kph my revs are between 4100-4300 and it's killing me on petrol, now I heard changing diff ratios is a solution, but then I hear also it's my gearbox ratios that aren't mixing well with the diff and it would be cheaper to change the gearbox instead cause if I change the rear diff ratios the front ones must be changed too, I got a gearmax diff with a cressida gearbox, any advice would be greatly appreciated.
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Haboob
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Fri Aug 07, 2015 10:50 am

Bigger tyres will also help with the revs...
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Macaco
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Fri Aug 07, 2015 10:54 am

I've alredy got 31" tires
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Gunta
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Location: Tofo mozambique.

Sat Aug 08, 2015 9:08 am

Very strange that it's revving so high. Where was your diff from? Cressida gearbox is the same as the 22R so shouldn't make a difference. What motor have you got in there?
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Macaco
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Tue Aug 11, 2015 3:18 pm

It had a full 5m conversion, gearbox and all, all I did was change the motor to the 7m, one person in spoken to says maybe the gearbox ratios and diff ratios aren't mixing well, another guys says just change diff ratios, then another says it's too expensive cause once you change the rear diff ratios the front diff must be changed too so it's more cost effective to just changed the gearbox, but then to what gearbox would best suit.
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Gunta
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Vehicle: 1996 80 series Land Cruiser VX 4500 EFI UK Import. Long range tank, Iron man suspension, ARB Bullbar, Front and rear diff locks, 33" BFG muds, Snorkel and attitude.
Real Name: Mark
Location: Tofo mozambique.

Tue Aug 11, 2015 5:39 pm

You can't change the rear without changing the front ratios otherwise you will damage your diffs, gearbox and transfer case. Easy thing would be to change the gearbox. All Toyota gearboxes will fit your bell housing. Running 33" tyres will help too by about 10%. Something seems wrong with your box if it's revving so high.
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Macaco
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Tue Aug 11, 2015 8:48 pm

That's the first thing that went through my mind, cause if it really is a cressida box then it should naturally have long ratios and especially for cruising in high gear, unless it's not the gearbox I was told it is, but then even my mechanic confirmed it was a toyota box, he actually thought it was the standard hilux box, I then told him it should be a cressida box and he said it could be they almost identical, so I don't know but now it's the second time I hear the gearbox is the problem, but now what box would I be looking at to resolve my problem.
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Gunta
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Real Name: Mark
Location: Tofo mozambique.

Wed Aug 12, 2015 7:04 am

A standard 22R box. It's a R151 I think. You might have a stout gearbox because they were made for low gearing.
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Macaco
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Wed Aug 12, 2015 7:43 am

That makes alot of sense, thanks Gunta, for all the advice, now I need to go gearbox hunting and one strong enough for the motor, any suggestions?
SFA for life baby
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Gunta
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Vehicle: 1996 80 series Land Cruiser VX 4500 EFI UK Import. Long range tank, Iron man suspension, ARB Bullbar, Front and rear diff locks, 33" BFG muds, Snorkel and attitude.
Real Name: Mark
Location: Tofo mozambique.

Wed Aug 12, 2015 8:18 am

R151 gearbox. Try Japan motors 0113976789
Worry about the things you can do something about, If you can't don't worry.
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Gunta
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Vehicle: 1996 80 series Land Cruiser VX 4500 EFI UK Import. Long range tank, Iron man suspension, ARB Bullbar, Front and rear diff locks, 33" BFG muds, Snorkel and attitude.
Real Name: Mark
Location: Tofo mozambique.

Wed Aug 12, 2015 8:23 am

Have you changed your transfer case at all because that could also be the problem?
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Macaco
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Wed Aug 12, 2015 9:21 am

No not that I know of, it's the original transfer case that's on the gearbox.
SFA for life baby
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Gunta
LR4WD, Lockers, Crawler Gears
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Joined: Tue Feb 23, 2010 10:36 am
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Vehicle: 1996 80 series Land Cruiser VX 4500 EFI UK Import. Long range tank, Iron man suspension, ARB Bullbar, Front and rear diff locks, 33" BFG muds, Snorkel and attitude.
Real Name: Mark
Location: Tofo mozambique.

Wed Aug 12, 2015 10:24 am

Try Japan Auto then.
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Vlak vark
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Sun Aug 16, 2015 6:24 am

you are running a 6 cylinder on a 4 cylinder cluster so your rev counter will be out by at least 1500 rpm.
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Gunta
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Posts: 1875
Joined: Tue Feb 23, 2010 10:36 am
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Vehicle: 1996 80 series Land Cruiser VX 4500 EFI UK Import. Long range tank, Iron man suspension, ARB Bullbar, Front and rear diff locks, 33" BFG muds, Snorkel and attitude.
Real Name: Mark
Location: Tofo mozambique.

Sun Aug 16, 2015 7:03 am

If you are running a 6 cylinder then that explains everything. You need to have your rev counter recalibrated for a 6 cylinder.
Worry about the things you can do something about, If you can't don't worry.
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Scott
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Sun Aug 16, 2015 3:52 pm

What is the revs at 120km/h on the SFA box ?
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Gunta
LR4WD, Lockers, Crawler Gears
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Posts: 1875
Joined: Tue Feb 23, 2010 10:36 am
Town: Johannesburg
Vehicle: 1996 80 series Land Cruiser VX 4500 EFI UK Import. Long range tank, Iron man suspension, ARB Bullbar, Front and rear diff locks, 33" BFG muds, Snorkel and attitude.
Real Name: Mark
Location: Tofo mozambique.

Sun Aug 16, 2015 5:39 pm

About 3750
Worry about the things you can do something about, If you can't don't worry.
Live life to the fullest with no regrets.
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