Bellhousing and Torque converter comparison

VZ version on the left, UZ on the right.









Notice the designation on the bellhousings...



And the TC's...

 

Here's the finished product:







The bellhousing bolts right on. No sealant was on either of the bellhousings I removed - the fit is perfect, so i guess it isn't needed.

One other thing - only one of the bolts had thread locker on it (one of the larger lower bolts)

The 4 smaller bolts get torqued to 25 ft lbs. The larger 2 get 42 ft lbs.

 

Ran into a potential snag. The input on the transmissions I have (A341E and A340F) are not the same. The portion where the splines engage is a little bit different, but the actual length of the input shafts are different which is probably a bigger deal. (A341E has the longer input) The problem is getting the TC to bolt to the driveplate and still engage the splines. It does not appear that it will work.

Here’s a drawing I whipped up showing the difference:

http://rigs.corequipment.com/Cebby/9...0Dims%2050.pdf

So, I guess the question is:

Do I swap out the output shaft and tailhousing from the A340F to the A341E

OR

Do I swap the input shaft from the A341E to the A340F? Anyone have an idea which is easier?

I’d prefer to use the A340F trans if possible since it is newer and has better gearing for off-roading.

So, the statements about grabbing any A340x trans and swapping bellhousings to do this swap doesn’t appear to hold water – unless I’m missing something…

 

I would think that input shafts would be easier. i could not tell you if they can be swaped though.

 

Does anyone know if the input shaft comes out as an assembly after removing the flange around the input? Or do I need to dismantle 1/2 the trans like you do to change the output?

I have a diagram, but it isn't really clear about how to pull the input (not step by step llike an FSM).

 

Well, I came across an install diagram. You can see it here: http://rigs.corequipment.com/Cebby/9...stallation.pdf

Looks to be a piece of cake. We'll see...

I hope all those guts are the same. I really want to use the A340F....

 

Guess what - swapping inputs IS a piece of cake. Put the a341e input into the A340F and vice versa.

Here's the pic of the A340F input and oil pump.


The A340F with the input and oil pump removed.




Here's the A340F parts and A341E parts (A340F is on the left)


The ring on the input assembly on the right corresponds to a speed sensor on the A341E. The A340F has a hole for the sensor and the mounting screw. I just need to knock out the freeze plug. I need to figure out is if the sensor in the tailhousing will work instead - looks to be the same, but I need to check their resistance and see what type of signal the ECU is expecting.


Here's the A340F area where a speed sensor could go:


Here's the one on the tailhousing of the A340F:


Here's the one on the case of the A341E:


Here's the input assemblies side by side - notice the A341E shaft is a bitt longer:

 

Oil Pumps are the same:




The oil pump drive (splined hollow shaft sticking out) is a little longer on the A341E.


Completed hybrid A340F:


If someone else is attempting this, you won't need a complete donor trans like I have. I'll figure out the fewest parts needed eventually and get this thing down to a shopping list.

 

Awesome Mike!!!

 

yay! go mikey!

 

You are either very lucky or damn good or both.

 

Both!

Actually, I knew that all of the A34_ _ trannies were very similar. (Exception being the A340H) Most of the changes from one version to another was bellhousing/TC to accommodate different engines which must also result in some changes to input shaft length and oil pump shaft length. All it took was one look at assembly instructions and you could see how easy it was to swap them.

Then the other end of the equation is the tailhousings and what works with tcases. I'm making it easy on myself doing the crawler. I could have gotten a tcase from a T100 if I wasn't doing the crawler. To swap outputs, you need to pull the valve body and all sorts of other stuff. I wanted to avoid that if possible.

My Marlin stuff should be here this week.

 

Very nice, now get that engine in there and fire it up. j/k.

Lookin real good.

 

This is pretty cool. Im glad I didnt have to mess around with trannies and all that stuff when I did my 3.4L swap, it still wouldnt be done!

So the A340F is from your 4Runner or a Lexus, or am I dazed and confussed?

Thanks

 

A340F is out of a 2000 4Runner limited. I pulled the tcase off since I'm going dual ultimate.

A340E is out of a 94 LS400. I've harvested the bellhousing, torque converter, input shaft and oil pump off of it.

To explore some more options (research, research, research), I have a bellhousing, input shaft, output shaft and tailhousing coming from a Tundra auto. Just trying to figure out what will be the easiest, cheapest route. I can always sell off my extra parts later...

 

Guess it's time to get to work...



MC07 lucky number 2554.

 

Here's a good read on auto crawler tech and gearing:

http://board.marlincrawler.com/index.php?topic=11786.0

 

That is a helpful link, thanks.

 

Dam dude, if you pull this off dive right in and cut that IFS off.

The Rubicon was UNREAL. That trail is so awsome.

Moab & Rubicon are two you guys HAVE to drive out to.

 

Cebby are you planning a valve body upgrade on your A340F?