Four Wheel Drive Speed

suntampafj · 07-25-2006, 05:21 PM

is there a max speed that one should drive in

4hi
4lo
4lo- rear locker engaged
4lo- a-trac engaged

**VDM** · 07-25-2006, 06:09 PM

in the manual, to lazy to go get mine

1983FJ60 · 07-25-2006, 06:10 PM

Hi range, everything unlocked, about 40mph--even if the figure is a bit higher.

Low range...

Well, you're not supposed to go fast.

Hotrodguru · 07-26-2006, 12:30 PM

Quote:

1983FJ60 previously said:

Hi range, everything unlocked, about 40mph--even if the figure is a bit higher.

Low range...

Well, you're not supposed to go fast.

Well manual says you have to be going less than 50mph to engage 4-HI from 2-HI. I don't think that has anything to do with the top speed in gear. I know in 4-LO the max I could go was around 35-40mph. I've cruised normal highway speeds in 4-HI in slippery conditions.

The manual does have specs though.

EDIT per manual:
Four-wheel drive models

Four-wheel drive control lever at "H2" or "H4"
"3" - 148 km/h (92 mph)
"2" - 101 km/h (63 mph)
"L" - 58 km/h (36 mph)

Four-wheel drive control lever at "L4"
"3" - 56 km/h (35 mph)
"2" - 38 km/h (24 mph)
"L" - 22 km/h (14 mph)

Maximum allowable speeds
1 - "H" 48 (30 mph) - "LL" 18 (11 mph)
2 - "H" 93 (58 mph) - "LL" 35 (22 mph)
1 - "H" 138 (86 mph) - "LL" 53 (33 mph)
1 - "H" 172 (107 mph) - "LL" 66 (41 mph)
1 - "H" 175 (109 mph) - "LL" 80 (50 mph)

1983FJ60 · 07-26-2006, 01:30 PM

Quote:

Hotrodguru previously said:

Well manual says you have to be going less than 50mph to engage 4-HI from 2-HI. I don't think that has anything to do with the top speed in gear. I know in 4-LO the max I could go was around 35-40mph. I've cruised normal highway speeds in 4-HI in slippery conditions.

...

In a part time system I'd never go above 40mph. You'll either cook the transfer case or damage the transmission.

If you feel the need to cruise at highway speed in 4WD, get the 6MT.

And I hope you didn't mean you were going 35mph in 4L.

Since that is insane and most likely impossible.

Hotrodguru · 07-26-2006, 01:39 PM

Quote:

1983FJ60 previously said:

...

In a part time system I'd never go above 40mph. You'll either cook the transfer case or damage the transmission.

If you feel the need to cruise at highway speed in 4WD, get the 6MT.

And I hope you didn't mean you were going 35mph in 4L.

Since that is insane and most likely impossible.

I don't see how, if this were the case Toyota would surely mention it. Now I'm new to off roading but there are plenty of new systems out there that allow this if designed properly. My Subaru is full time AWD and goes well over 150mph.

On the beach I was in 4L DRIVE and wanted to see what the gearing was like. At around 25-30mph it was only turning 3k rpm. Is your statement based on concrete experience or something factual? Just curious....

1983FJ60 · 07-26-2006, 01:44 PM

Quote:

Hotrodguru previously said:

I don't see how, if this were the case Toyota would surely mention it. Now I'm new to off roading but there are plenty of new systems out there that allow this if designed properly. My Subaru is full time AWD and goes well over 150mph.

On the beach I was in 4L DRIVE and wanted to see what the gearing was like. At around 25-30mph it was only turning 3k rpm. Is your statement based on concrete experience or something factual? Just curious....

Yes.

Your Subaru's all wheel drive system doesn't have a transfer case--so it's completely different from your FJ Cruiser's, which is meant to be used off road, or in the snow in very adverse conditons and low speeds.

Your Subaru also doesn't have a low range, locking center differential, or any of those systems. You're essentially tearing up your transfer case gears by exposing them to speeds they were never meant to see in 4L--and the center locker for that matter. I'm really surprised that you hit 35mph in 4LOW--I've never gone above 5mph in Low range. And I'm surprised that your center locker didn't break--or anything else for that matter.

I think that you have a difficult time sorting out the different kinds of four wheel drive involved here, but be assured that the only FJ that can go in four wheel drive at highway speeds without damaging anything is the 6MT.