AWD to part time 4wd

[coatesy Junior Member Find all posts View Profile Close coatesy]

Hi, sorry for digin up an old thread however I recently had some experiance with this. Recently I had my car in the shop getting some tuning work done on the dyno, when I went to pick it up it was having its last dyno run. On witnesing this run I noticed that they only had the rear wheels on the dyno and the fronts were chocked up, uppon raising the question why only the rear wheels were on the dyno I was todl that with these models they are predominately a rear wheel drive 4x4. On furthur questioning I was informed that yes if I was to put manual locking hubs on the front I would be able to put an auto locker in the front and would loose no power by having the front drive shaft still spinning as it would be all tfansferd to the rear with the way the transfer is set up. This would also enable you to select L4 with the front not binding up on bitumen or concrete for backing trailers ect. Any furthur points to this are muchly invited to see if my tuner is on the right path

[MalcomM Senior Member Find all posts View Profile Close MalcomM]

Checkout www.trademe.co.nz and do a search for prado hub conversion.

There is a lot of conversions done to Prados over there. Not sure what models though as everything is a Jap import so the numbers don't always match up.

[williade Avid PP Poster! Find all posts View Profile Close williade]

.. I noticed that they only had the rear wheels on the dyno and the fronts were chocked up.

That would put terrific strain on the planetary gears of the centre diff, especially while being flogged on a dyno. The 90 series doesn't have any kind of torque biasing so its incorrect to say that it is predominately a rear wheel.

The centre diff is completely open so will always split the torque 50/50 unless its locked in which case will split rotational speed evenly regardless of the load (torque).

[glen_ep Addicted PP Member Find all posts View Profile Close glen_ep]

Hey coatesy,

With the centre unlocked, the power will go to the path with least resistance, full stop.

Whilst the front wheels were chocked on the dyno, all power went to the rear because it had the least resistance. There would have been some terrible whining emitted from the transfer whilst running this way. I don't know exactly what stress this could create, but I'm sure it's bad, and there's no way I'd allow them to do that!! They should have removed the front drive shaft, and locked the centre differential.

If you install manual hubs, and disengaged them, there would be almost no resistance on the front drive line, so all power will be sent to the front, and your car will not drive at all.

[Beast2h Member Find all posts View Profile Close Beast2h]

Very bad for the planetary set in the transfer case, I would be very upset if I seen a workshop doing that with my Prado! The Transfer cases a weak enough as it is with the centre diff unlocked!

[croozza Avid PP Poster! Find all posts View Profile Close croozza]

Basically, look at the size of the hub on the Prado, they dont make free wheeling hubs in that size, so even if you did modify the transfer case, it will not work.

[MalcomM Senior Member Find all posts View Profile Close MalcomM]

Basically, look at the size of the hub on the Prado, they dont make free wheeling hubs in that size, so even if you did modify the transfer case, it will not work.

The Kiwis sell replacement hubs. See above...

[williade Avid PP Poster! Find all posts View Profile Close williade]

The Kiwis sell replacement hubs. See above...

No they don't. Not a single 90 series free wheeling hub was turned up by searching for "prado hub conversion". The only prado listings were for 70 series prados which are a jap import they share the exact same live front axle as the 80/105/76/78/79 series 'cruisers.

[trimardito Junior Member Find all posts View Profile Close trimardito]

Hi,

Seeing as this thread revived I might chime in. Ive seen locking hub conversions for the 90 series, long time ago on venezuelan forums, I can dig it up later. Id rather spend money getting a part time transfer case than get locking hubs and drive around with the CD locked, it puts less strain on the front end and transfer to have the front end spinning due to the wheels spinning than the engine forcing it. If you can get locking hubs + part time transfer that would be optimal

That said, there are 90 series' part time cases, Im moving from a 2002 VZJ95 AWD auto to a 2008 RZJ90 4wd manual. I'd love to get locking hubs for it since its already part time that way my front end can last longer on regular road driving. Im not sure if the w56 manual transmission on the 90 has the same bolt pattern as the A343f auto on the 95 but im pretty sure something can be made for them to fit!!

[MDST Member Find all posts View Profile Close MDST]

Trimardito is rigth. Here in Venezuela are a few Prados ( here the 90 series 3RZ came with part time transfer case ) with manual hub conversion.

I`m going to do the manual hub conversion soon and I promise open a thread with the hole process.

I have spindles, manual locking hubs and manual cv axles from a Tacoma 1998. Just swap everything over and that's all.

Cheers

[MDST Member Find all posts View Profile Close MDST]

In Japan some Prados came with manual hubs from factory:

Prado 95 series 1997 with 1KZ engine and manual locking hubs:



Uploaded with ImageShack.us

Link: http://www.toyoteros.com.ar/foro/sho....php?tid=29626

Here a 90 series 1997 3RZ engine and manual locking hubs ( Warn 8000 from factory too ):



Uploaded with ImageShack.us

Cheers

[croozza Avid PP Poster! Find all posts View Profile Close croozza]

Those two pics are not vehicles in Japan, basically, only countries in South America, and some in South Africa, got the part time versions, these were the bare bones basic povity pack ones, the rest of the world got full time, and only a few countries got twin fuel tanks. The likelyhood of finding a part time kit, let alone the correct hub would be like finding a needle in a haystack. As the original post was from a country that only got the full time version (even if it was years old), this is the info we should be working on

[trimardito Junior Member Find all posts View Profile Close trimardito]

That might be true but I dont think itll be that hard. Again, Ive seen kits..

For the people who asked about having the low range without the CDL activated, there's something people do to the AWD 80 series cases called the "7pin mod" that basically eliminates the cdl locking automatically when selecting low range and making the CDL lock via a button for either H or L. (it already uses a button for activation and lever for H-N-L). Now, im pretty certain the CDL on the 90s is electric, if it is it can be bypassed to a button, thus eliminating the locking when selecting HL or LL on the lever. If its not well there's no way around it. If it is possible im not sure id be willing to be the first one to try it, it probably is more complicated than i imagine...

[williade Avid PP Poster! Find all posts View Profile Close williade]

That might be true but I dont think itll be that hard. Again, Ive seen kits..

For the people who asked about having the low range without the CDL activated, there's something people do to the AWD 80 series cases called the "7pin mod" that basically eliminates the cdl locking automatically when selecting low range and making the CDL lock via a button for either H or L. (it already uses a button for activation and lever for H-N-L). Now, im pretty certain the CDL on the 90s is electric, if it is it can be bypassed to a button, thus eliminating the locking when selecting HL or LL on the lever. If its not well there's no way around it. If it is possible im not sure id be willing to be the first one to try it, it probably is more complicated than i imagine...

I have the centre diff lock mod on my 80 series but its not at all applicable to Prados.

90 series Prados with traction control have an electronically actuated diff lock that's controlled by a button on the dash and it doesn't automatically activate in low range so the 80 series mod isn't needed. The rest of the full-time 4wd 90 series use a mechanical diff lock, so short of redesigning the selector levers, there is no simple mod to allow the use of low range without the centre diff locked.

[MDST Member Find all posts View Profile Close MDST]

Those two pics are not vehicles in Japan, basically, only countries in South America, and some in South Africa, got the part time versions, these were the bare bones basic povity pack ones, the rest of the world got full time, and only a few countries got twin fuel tanks. The likelyhood of finding a part time kit, let alone the correct hub would be like finding a needle in a haystack. As the original post was from a country that only got the full time version (even if it was years old), this is the info we should be working on

Those 2 Prados my friend croozza, are directly imported from Japan to South America ( Argentina and Chile respectively ). Obviously those are not pictures in Japan. I talk once with the 90 series owner and he purchased his Prado to a japanese importer in Chile.

Here in Venezuela, there are 2 versions. Full Time ( 95 series ) and Part Time ( 90 series ). The 90 series here is the most basic one.

These 2 pics are just for information.

Cheers