2UZ transmission thoughts.

[Tigerstripe40]

I am considering putting a 2UZ drivetrain into my FJ40.
The FJ40 would be stretched 10".

I've been planning to get a 2UZ and A750 and associated wiring out of a Sequoia. This can be connected to the J80/J100 transfer case with a 3:1 low range gear set.
But the A750 is VERY long.

If I could, I'd run a TR4050, but I have not been able to find a bellhousing adapter to a 2UZ for that transmission.
H55F bellhousing needs to come from Australia and I need to ship the ring gear overseas. This seems Sub-Optimal.

An R15x/AR5 is a consideration, but these are also very long, and the first gear isn't very deep for rock crawling (If I go manual, I'd like to match the 70:1 I currently have). I'd need to go to an Atlas2 in order to get the deep gearing I already have, or I'd need to get a NWFab BlackBox to adapt to a Land Cruiser split case.

The ZF 8HP70 seems to be a poprular transmission right now (its being used in the Ineos Grenadier, a bunch of MOPARs, and other applications). It will adapt to the J80/J100 transfer or the Split Case, and 51:1 w/ an automatic would get me into the crawl ratio range I'd like to be.

Cheapest/Easiest option would be the A750.
That said, for the cost of the ZF 8HP, TCU, adapters, etc, I might be getting into 1HD-FTE/H155f territory in terms of costs...

 

[Vossie]

Have daily'd a 1uz and a650 combo in my rig for 2 years. Loved it. But I'm in the middle of ditching my a650 for a h150, the 5 speed manual from the 80 series.

It is possible to use all toyota part numbers for this conversion, as there were middle east model 100 series that came with a h151 behind a 2uz. Also a fair bit shorter than the a650 or 750 option and even the r151 option.

An ZF 8hp is an awesome box, but expensive to modify. But if money is no problem, it's a great option

 

[archie73]

@Tigerstripe40 did you ever get around to this ? I’m contemplating doing it in a ~115” chasis and I’m debating what transfer case to put behind it. I have a splitcase on hand, but that would require the NWFab box ($$$). There’s someone working on a home fab/AA solution as well, but I haven’t seen the resolution on it yet. My other thought is the 80/100 box (HF2A), my only concern is that it’s only 3:1. Currently, I have 107:1 and 35’s. So I guess that is my benchmark, but somewhere around and 37’s.

Wondering where your thoughts are on the Tcase options? One other thing, I’m trying to stay Toyota on this one. So the NWFab is an expensive diversion, but not completely out of the question.

 

[Tigerstripe40]

Project is currently on hold as I had to do some home remodel stuff and that took time/money/effort away from the FJ40 project.

I guess to question is, what transmission are you looking at using? A750? H15x? H55F? R15x?

A750 → Split case would as you say, require the NWFab black box which would be pretty cool. Or, if you could find one, a ToyBox (I wouldn't hold my breath on that, and if you break anything MC specific on those, you're not getting new parts from MC BTDT).

3:1 is also about the limit with a split case as to go any lower (3.3:1 or 4:1) you need to underdrive the high range gear set which negates the overdrive transmission.

That said, A750 1st gear at 3.5:1 with 3:1 t-case and 4.11's nets about 87:1 crawl ratio if you factor the Torque Converter is effectively 2:1 and thats plenty low for most applications. (my FJ40 is currently about 67:1 and thats really plenty low enough).

All of the Toyota manual options don't offer much more than 4.5:1 1st gear (and the 'cheap' transmissions are still 3.5:1 1st gear).

Lack of an adapter to the TR4050, and the 1st gear options for the toyota manuals that can be adapted to the 2UZ is the biggest drawback to the 2UZ for me.

I am looking at other engine options, specifically, OM606 or M57 diesels.

 

[archie73]

Project is currently on hold as I had to do some home remodel stuff and that took time/money/effort away from the FJ40 project.

Time and projects ebb and flow…

I guess to question is, what transmission are you looking at using? A750? H15x? H55F? R15x?

A750 → Split case would as you say, require the NWFab black box which would be pretty cool. Or, if you could find one, a ToyBox (I wouldn't hold my breath on that, and if you break anything MC specific on those, you're not getting new parts from MC BTDT).

I want an auto in this project. I stubbornly kept the manual in my 40 because “I like to row.” And I do, but I want to try an auto in the one. Plus if I go 2UZ, then it’s kinda the easy option.

Like I said: the cost of the NWFab box is daunting, but not insurmountable. I think you need a AA adapter (~$500) on top of the box. Range choices would be nice and then you could keep the stock transfer gearing.

3:1 is also about the limit with a split case as to go any lower (3.3:1 or 4:1) you need to underdrive the high range gear set which negates the overdrive transmission.

That said, A750 1st gear at 3.5:1 with 3:1 t-case and 4.11's nets about 87:1 crawl ratio if you factor the Torque Converter is effectively 2:1 and thats plenty low for most applications. (my FJ40 is currently about 67:1 and thats really plenty low enough).

All of the Toyota manual options don't offer much more than 4.5:1 1st gear (and the 'cheap' transmissions are still 3.5:1 1st gear).

Lack of an adapter to the TR4050, and the 1st gear options for the toyota manuals that can be adapted to the 2UZ is the biggest drawback to the 2UZ for me.

If I was looking at manuals, I’d agree. My 40 is a total mutt and I’m trying to stay Toyota on the next one…

 

[Tigerstripe40]

Time and projects ebb and flow…

I want an auto in this project. I stubbornly kept the manual in my 40 because “I like to row.” And I do, but I want to try an auto in the one. Plus if I go 2UZ, then it’s kinda the easy option.

Like I said: the cost of the NWFab box is daunting, but not insurmountable. I think you need a AA adapter (~$500) on top of the box. Range choices would be nice and then you could keep the stock transfer gearing.

If I was looking at manuals, I’d agree. My 40 is a total mutt and I’m trying to stay Toyota on the next one…

Autos make rock crawling easier. I have found that wheeling an auto, I am looking for harder lines than I would be with a manual, as I can focus on wheel placement and where I am going rather than feathering the clutch, if I have enough momentum, etc.

If I do go 2UZ, then I am sure I will go with a ZF 8HP, as thats pretty adaptable to any trasnfer case you could want, and with the 5.5:1 first gear, gives overall crawl ratio of 66:1 with stock HF2A gearing, which for an auto is going to be like having 120:1. AKA Ridiculous.

FWIW< they are using the ZF 8HP in the MKV Supra for the automatic, so I suppose you could consider it to still be Toyota

 

[DangerNoodle]

I have an 8l90 -> 3.8 atlas in mine and absolutley love it. I have put in several 8hp70s, they are vastly superior to a 8l90 imo. I highly recommend that trans.