1. the type without a center diff. this type is the type used on many Toyota 4WDs including some Land Cruisers (mostly the old ones)
2. the one with the Multi-Mode transfer case. this type has a gear-type lockable center diff. Although this has AWD (H4 mode), it is still considered part-time because it has the option to disengage the front diff (H2 mode)
Last edited by HiluxSurf SSR-G; 02-24-2021 at 09:30 PM.
1. the type without a center diff. this type is the type used on many Toyota 4WDs including some Land Cruisers (mostly the old ones)
2. the one with the Multi-Mode transfer case. this type has a gear-type lockable center diff. Although this has AWD (H4 mode), it is still considered part-time because it has the option to disengage the front diff (H2 mode)
You may want to.define better what you mean by #1.... the terms transfercase and center differential are pretty squishy when it comes to land cruisers.
All Fj60 and prior had a true 4wd transfercase and manual locking hubs in the front, even if they were vacuum chamber controlled for "front drive" (4wd). My 1971 FJ40 originally had a vacuum controlled FD transfercase but it was exactly the same as a stick shift - with the transfercase easily changeable.
The FJ80 and later all had full time 4wd transfercase, but had center locking differentials - which pretty much makes them a center differential.
These transfercases acted the same, essentially, as my 1988 Corolla Alltrac- it is 4wd full time with a center differential (only different in that the center diff is incorporated into the transmission) with a CDL... except it didn't have a high/low range.
I would not agree that an AWD (or full time 4wd, however you want to phrase it) is the same as a traditional transfercase that is in 4 wheel drive high.
The Landcruisers and 2000+ T4Rs get away with a "full time 4wd" because they have some form of traction control and/or VSC. As a wheel starts to slip the traction control can take over to ensure power is delivered to wheels with less traction.
Last edited by toyotaspeed90; 02-25-2021 at 02:26 AM.
the gear-type center diff is found inside the transfer case. But not all transfer cases have a center diff. The ones without a center diff are the ones used in TRADITIONAL part-time 4WD systems either via the ADD or the manual/electric locking hub.
IIRC, the first LC that had Full-Time 4WD (center diff inside the HF2AV TC) was the LC80 but there were also LC80s in other countries that had a part-time 4WD system using manual locking hubs. I've seen LC70s that have the switch to engage the front locking hubs.
about H4:
I was referring to the ones with Multi-Mode 4WD (1999-2002) transfer case. for this case, H4 is AWD and H2 is 2WD. when the center diff is locked, it is H4L/L4L. On the transfer lever diagram (1999-2000), it is: H2-H4 / H4L / N / L4L.
I understand that in those transfer cases without the center diff, H4 is known as High-range 4WD and is equivalent to the Multi-Mode's H4L.
Quote:
Originally Posted by toyotaspeed90
You may want to.define better what you mean by #1.... the terms transfercase and center differential are pretty squishy when it comes to land cruisers.
All Fj60 and prior had a true 4wd transfercase and manual locking hubs in the front, even if they were vacuum chamber controlled for "front drive" (4wd). My 1971 FJ40 originally had a vacuum controlled FD transfercase but it was exactly the same as a stick shift - with the transfercase easily changeable.
The FJ80 and later all had full time 4wd transfercase, but had center locking differentials - which pretty much makes them a center differential.
These transfercases acted the same, essentially, as my 1988 Corolla Alltrac- it is 4wd full time with a center differential (only different in that the center diff is incorporated into the transmission) with a CDL... except it didn't have a high/low range.
I would not agree that an AWD (or full time 4wd, however you want to phrase it) is the same as a traditional transfercase that is in 4 wheel drive high.
The Landcruisers and 2000+ T4Rs get away with a "full time 4wd" because they have some form of traction control and/or VSC. As a wheel starts to slip the traction control can take over to ensure power is delivered to wheels with less traction.
Last edited by HiluxSurf SSR-G; 02-25-2021 at 10:19 PM.
4HI (a button push) on my '01 T4R will work just fine as long as none of your wheels will loose contact with the ground like in the video, otherwise engage the CDL to get true 4WD so that all wheels pull even if one has lost ground contact.
Eddie
Quote:
Originally Posted by T4R2014
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I think the problem here is that people think the center locker is something that part time 4wd systems do not have.
Let's make it clear, part time systems do not have a center locker because they do not have a center diff. Does this mean that all 4wd systems with a center diff have lockers? NO! The part time system is naturally locked in the same way that your femur bone cannot bend in the middle of it. It isn't possible, and trying to make it do the opposite is outside its realm of operation.
Care to elaborate? I have a 2000 Limited so it's a part time 4wd system with a center diff lock.
Quote:
Originally Posted by T4R2014
Lmao this is fantastic.
What's fantastic is your inability to explain further for clarification.
Care to elaborate? I have a 2000 Limited so it's a part time 4wd system with a center diff lock.
What's fantastic is your inability to explain further for clarification.
Which is why it's called multimode. Think of it as a bonus 2WD option to the fulltime. Mitsubishi came up with the idea in 1990 (Super select) and all the Japanese brands rushed to come up with a competitor(Toyota with multimode, Isuzu with TOD, Nissan with All-mode). The video should explain the rest. For anymore clarification my rate is $100 per hour for a zoom call with white board illustrations.
Which is why it's called multimode. Think of it as a bonus 2WD option to the fulltime. Mitsubishi came up with the idea in 1990 (Super select) and all the Japanese brands rushed to come up with a competitor(Toyota with multimode, Isuzu with TOD, Nissan with All-mode). The video should explain the rest. For anymore clarification my rate is $100 per hour for a zoom call with white board illustrations.
That's all great and everything but it's a part time 4wd system with a center diff lock which you said "Let's make it clear, part time systems do not have a center locker because they do not have a center diff." So how are you going to claim that when every 99-00 4wd Limited and every 01-02 4wd are part time 4wd with a center diff lock? I'm trying to have an intelligent conversation for clarification and you're being a ****ing twat with a stick up their ass.
Quote:
Originally Posted by T4R2014
I think the problem here is that people think the center locker is something that part time 4wd systems do not have.
Let's make it clear, part time systems do not have a center locker because they do not have a center diff. Does this mean that all 4wd systems with a center diff have lockers? NO! The part time system is naturally locked in the same way that your femur bone cannot bend in the middle of it. It isn't possible, and trying to make it do the opposite is outside its realm of operation.
That's all great and everything but it's a part time 4wd system with a center diff lock which you said "Let's make it clear, part time systems do not have a center locker because they do not have a center diff." So how are you going to claim that when every 99-00 4wd Limited and every 01-02 4wd are part time 4wd with a center diff lock? I'm trying to have an intelligent conversation for clarification and you're being a ****ing twat with a stick up their ass.
The only clarification is that normal part-time 4WD systems don't have a center diff. Any road-going full-time 4WD will have a center diff (and associated locker or it would be AWD, not 4WD). The multi-mode case doesn't fit into either category.
-Charlie
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He's saying the part time systems (VF2A's) do NOT have a center differential. And he's right, they don't. It's either engaged or it's not. With a Multi-Mode (VF3A's), it's a differential style case.
No Differential = True 4WD
Differential = AWD OR 4WD
When people refer to "Part Time" or "Full Time" 4WD, they're talking about what kind of road conditions you can operate it on. You can't operate a non differential (True 4WD) case "full time", hence "Part Time". You CAN run a differential case "Full Time". Once you engage the CDL it functions exactly like a "Part Time" System.
My argument has never been that the CDL is or isn't a differential or a locking mechanism, it's that it's not some feature that was some kind of magical option on the later 3rd Gens. It's literally the design.
That's all great and everything but it's a part time 4wd system with a center diff lock which you said "Let's make it clear, part time systems do not have a center locker because they do not have a center diff." So how are you going to claim that when every 99-00 4wd Limited and every 01-02 4wd are part time 4wd with a center diff lock? I'm trying to have an intelligent conversation for clarification and you're being a ****ing twat with a stick up their ass.
A part time system doesn't have a center diff broski. 99-00 Limited and 01-02 4wd are multimode.
I would disagree on this. If a vehicle, say a USDM UZJ100, which is a full-time 4WD vehicle goes offroad and locks the center diff, it DOESN'T become a part-time 4WD. it is STILL a full-time 4WD vehicle. If a 2000 4Runner Limited goes offroad and engages 4WD & locks the center diff, it is still a part-time 4WD vehicle but is in H4L mode
To me, a part-time 4WD is a vehicle that has the option to disengage the front axle and run using 2WD mode, while a full-time 4WD is a vehicle that has NO option to run on 2WD mode.
Quote:
Originally Posted by Cree
When people refer to "Part Time" or "Full Time" 4WD, they're talking about what kind of road conditions you can operate it on. You can't operate a non differential (True 4WD) case "full time", hence "Part Time". You CAN run a differential case "Full Time". Once you engage the CDL it becomes a "Part Time" System.
Last edited by HiluxSurf SSR-G; 02-26-2021 at 10:11 PM.
I would disagree on this. If a vehicle, say a USDM UZJ100, which is a full-time 4WD vehicle goes offroad and locks the center diff, it DOESN'T become a part-time 4WD. it is STILL a full-time 4WD vehicle. If a 2000 4Runner Limited goes offroad and engages 4WD & locks the center diff, it is still a part-time 4WD vehicle but is in H4L mode
To me, a part-time 4WD is a vehicle that has the option to disengage the front axle and run using 2WD mode, while a full-time 4WD is a vehicle that has NO option to run on 2WD mode.
Agreed here. I think what Cree is trying to get at is that an engaged part time 4WD system and a locked center full time 4WD system achieve the same basic function in terms of traction. We are working with very precise definitions here.
Agreed here. I think what Cree is trying to get at is that an engaged part time 4WD system and a locked center full time 4WD system achieve the same basic function in terms of traction. We are working with very precise definitions here.
Correct.
Also, I'm speaking SPECIFICALLY about 3rd Gens and how their systems function. Reasons I referenced t cases.
A part time system doesn't have a center diff broski. 99-00 Limited and 01-02 4wd are multimode.
Was that so hard to say instead of implying I need a drawing or laughing? Then what does it have that allows the transfer of power to the front axle when in 4Hi?