<smirk>, I've been married long enough to know better than to cannibalize her car <img src="/forums/images/graemlins/shiner.gif" alt="" /> Besides, her's has a wood-grain overlay that just doesn't go with my interior <img src="/forums/images/graemlins/lol.gif" alt="" />



The 1st gen Amigo did use this tranny in 2wd form. Never had an auto with 4wd though. It came only in the Trooper. It's also an A340H, with an integral, hydraulic driven t-case. I think the case even shares oil with the tranny, so ya can't just bolt on a different one, or take it off and bolt to something else.

As for my Isuzu Purism, I AM planning on using Isuzu output flanges on the D300 at least <img src="/forums/images/graemlins/bird.gif" alt="" /> <img src="/forums/images/graemlins/smile.gif" alt="" />


Klune? What Klune?




You're just loving this aren't you. At least I lasted longer than you did. <img src="/forums/images/graemlins/nana.gif" alt="" />

--Dan

Dunno if Kammy trusts me to do the same... I'm beginning to think she buys cars specifically to avoid that possibility. <img src="/forums/images/graemlins/pfft.gif" alt="" />


It does share the oil -- there's a line out of the back of the transfer case FWD rear bearing pocket (could be a pump in there?) that goes up to the transmission. I was looking at Don's Trooper last weekend and thinking it had to be chain drive... how does the hydraulic drive setup work?


If it helps you sleep nights, bro, I'll get behind it. <img src="/forums/images/graemlins/butwiggle.gif" alt="" />


<img src="/forums/images/graemlins/smile.gif" alt="" /> TOTALLY. <img src="/forums/images/graemlins/smile.gif" alt="" />

Randii

Sorry guys, pardon my ignorance... but what are the differences in the A340E, A340F, and AW4? Is it just the vehicle they are used in? <img src="/forums/images/graemlins/confused.gif" alt="" />

Yep you're right, thats Mr. Wayne "Rotozuk" F. himself. I'm working on wedging a late model toyota motor into a not so late model 4x4 made in the same country as our isuzus, that also shares an "unacceptable" rating from our friends over at consumer reports.

More details about the project are on my site, but I dont wanna post em here and clutter up your uber cool isuzu tech post.

Dallas

The Tundra V8 has the same designation "A340F" tranny as my V6 4Runner but the one behind the Tundra V8 seems to survive more torque since the V8 can be supercharged as well with TRD parts installed at the dealership. A couple supercharged 4Runners have destroyed their trannys at sea level in conjuction with a few fuel mods. I bring this up here because I've checked at the Toy dealership about what parts are different between the Tundra and 4Runner A340F's. EVERY part number for the internals of those trannies is different. Not sure of the significance of that fact yet. Yes, Level10 mods are available to soop up the valve body as well as the transmission itself, if needed. Then it's said to be good up to 600 HP. So it's certainly a good transmission, or at least the foundation of a good transmission.

I don't know anything about how the internals compare to the Jeep AW4. Congrats to Dan for figuring out that the same transmission is cheaper and more readily available as a Jeep part. Plus the Klune is an easy addition and way cool.

correct me if i'm wrong, but are you saying that if you have a 2.6 auto trooper, any of those motors will bolt to the stock tranny and bellhousing?

Yes. [Edit] oops, no, not to your existing bell housing. You can use the 2.6 tranny, but you will need to get the bellhousing that'll match the motor you're swapping to. A 2.6 bell fits only the 4Z series. You'd need the new Isuzu bell for a 3.2/3.5 or any of the GM engines with the 60 deg bell housing.

A quick run-down.

The A340 is a very popular tranny in different variants. The key thing is that the main body is the same regardless of what manufacture is using it. Things like bell housings, torque converters, output shafts, tail housings and internal clutches, etc, are different depending on what it's in. *ALL* variances are handled in the bell and tail housing. i.e, something with a big, thick TC will account for that with a big, deep bell housing.

You can swap the bell housing that fits your motor, to an A340 from a different vehicle. This will let you physically bolt it up, but you'll need to account for electronics / TCM yourself. Hardware like the TCM and wiring harness may be very similar, or even the same between makes / models, but I'm unsure of that. The programming will certainly be vehicle specific though.

So...

A340H
This has a hydraulic t-case. Not sure what that means, but it is integral to the tranny. You need to pull the t-case apart to get to the bolts to remove it from the tranny.
This is what Isuzu used in the 2.6 Trooper. They called it the 30-80LE
Used by Toyota early on too.

A340E
2wd version of the A340. No t-case, just a 2wd tail housing. Probably different output shaft variants for different manufactures too.

A340F
Used specifically by Toyota I think starting around '94 or '95. This uses a mechanical, chain-drive t-case. If you want Marlin Crawlers, you can use this tranny, his parts/adapters, toy t-cases and whatever bell, TC, flexplate that will fit your motor.

Some are 21 spline outputs (early 4cyl maybe?). Most I think are 23 spline. If you've got parts already, this could be a good drivetrain. To buy all new though, for tranny (used) and a complete Marlin dual-tcase crawler setup with all the adapters need, the dual t-cases, 4.7's in one case, etc., you're looking at *at least* $2500. That's the main reason I didn't go this route, as I have *no* Toy parts starting out.

AW4
Jeep variant. Used a mechanical t-case, usually a NP-231. The tail housing is the common 6-bolt pattern though, so there's a ton of NP/NV t-cases that'll bolt up. Mine has a big sticker that says 30-40LE

It's also 21/23 spline. It seems the cutoff date is around '91. Before that, it was 21 or 23 depending on the engine. After that, they were all 23 spline.

These were used in a couple different models in different years I think. It's been the auto in nearly every Cherokee though. There's a ton of these out there and it's very cheap compared to a Toy A340F.

Note: According to Marlin, the Jeep 23 spline is *not* the same as the Toyota 23 spline. The shaft on the AW4 is about 1" - 1.5" longer than the Toy A340F, but I thought originally you could still use Marlin's adapters with an extra spacer. He says the shaft diameters are different though. Off by 30 thou or something. Spline pitch is probably different too.

AW4's also used 2 different OD ratios. Early ones were the typical .7:1 ratio. Again, don't know the cutoff, but by around '95 or so, all were using a shallower .75:1 OD. If you search the www.naxja.org forums for AW4, you'll find a ton of info on these.


Theres a bunch more too. The A343 was an upgraded A340. Can't remember specifics though on 2wd/4wd or vehicles. There is also a version behind some big, V8 luxo SUV that uses a much larger and deeper torque converter and a larger input shaft to account for it. That's the only variant that has a different input shaft that I can think of though.


So, in general, if your particular motor used one of these, you could obtain the bell housing, torque converter and flexplate for that motor/tranny combo, and bolt it to any other A340 variant. Use a Toy A340F to run Toy t-cases and Marlin crawlers. Use a Jeep AW4 for NV/NP t-cases, Klune-V's, Atlas II's, Dana 300, etc.

--Dan

Hi Sean, I think I just covered these in my previous response. But yes, the A340H auto does have a removable bell. I'm not sure what the auto was in the 1st gen Amigo. I suspect it was an A340 though, but it was 2wd only. The Trooper, to my knowledge, was the only 2.6 Isuzu with a 4wd auto behind it, and that was the A340H. If the 2wd Amigo did use the A340 though, that would be another source for just the bellhousing to look for.

As for finding one, dunno. I've had a hard time finding a flexplate & torque converter for one used. St Charles has the flexplate for $85 new and I think I'm gonna end up doing that. And Jerry has loaned me his 2.6 bell housing. Car-parts.com is the best bet. Search for the tranny, then call around seeing if they'll sell just the bell and TC. They usually won't split them up though unless they've been sitting on a bunch of them for a while.

--Dan

Heh, no worries. <img src="/forums/images/graemlins/cheers.gif" alt="" /> I figured it was for your Sammy project if Wayne was involved. Hadn't heard anything on the new motor for it yet though.

--Dan

so this DOESN'T open up any motor swap possibilities to the 4 cyl. mua5 because it's a different/integrated bellhousing, correct?