Author Topic: Auto Duals? (Read 4271 times)

THK Matt · « **on:** Apr 16, 2009, 12:01:48 AM »

yeah yeah it's been covered.... but the search option doesn't work.

what does it take to stick a second case behind my A340H auto case?
what options are there?

$Beer Chug\'n$

jimbo74 · « **Reply #1 on:** Apr 16, 2009, 12:15:08 AM »

i guess, you cant do it with marlin stuff.... they do have a dual case adapter for a a340f though

http://www.4x4wire.com/toyota/tech/autocrawler/

i remember way back, there was a place that said they could do it.... but i don't know if they really had any production ones... might try to contact them

http://www.gearslug.com/

i think inchworm has one too

http://www.inchwormgear.com/store/product_info.php?cPath=21_89_92&products_id=86

THK Matt · « **Reply #2 on:** Apr 16, 2009, 12:23:27 AM »

gotta go to a A340F, damn....
I'll go to a R150F instead lol being as I have one.

that looks too involved for my dumb ass. lol

Joey88RUNR · « **Reply #3 on:** Apr 16, 2009, 08:34:11 AM »

i think you can also run single 4.70s with auto

THK Matt · « **Reply #4 on:** Apr 16, 2009, 10:27:41 PM »

you still need an A340F, the H you can not swap gears

dniel · « **Reply #5 on:** Apr 16, 2009, 11:19:45 PM »

The 340f go for about 200$ in the junk yards here in Portland. Check car-parts.com. Look for one out of a 95+ 4runner as these are the most common. The Inchworm adapter bolts strait up to the factory tailhousing and is around 400$. The only down side is you need a 23 spline front case but if you only run one case with 4.7 it won't matter cost wise. A single 4.7 case should be plenty low enough with the auto but it might suck losing the stock low range for higher speed stuff.

340f with inchworm adapter to gear driven case. The tranny is from a tundra but they are all pretty much the same.

THK Matt · « **Reply #6 on:** Apr 17, 2009, 06:49:43 AM »

are those 10* clockable?
thanks for the info!

dniel · « **Reply #7 on:** Apr 17, 2009, 08:58:47 AM »

Quote from: ThatIDAHOKid on Apr 17, 2009, 06:49:43 AM

are those 10* clockable?
thanks for the info!

There are several degrees you can clock it at. I don't remember the numbers but I think it will go up to 15* one way and 10* the other in 5* increments. The info should be on the inch worm site. They call it a tacoma adapter but it will work with any 340f or late model r150 as far as I know.

THK Matt · « **Reply #8 on:** Apr 17, 2009, 11:20:34 AM »

Quote from: dniel on Apr 17, 2009, 08:58:47 AM

There are several degrees you can clock it at. I don't remember the numbers but I think it will go up to 15* one way and 10* the other in 5* increments. The info should be on the inch worm site. They call it a tacoma adapter but it will work with any 340f or late model r150 as far as I know.

Awesome!!!! would this adaptor work on a 91 R150F? or you mean late model as in 95+?

jimbo74 · « **Reply #9 on:** Apr 17, 2009, 11:26:40 AM »

http://www.inchwormgear.com/store/product_info.php?cPath=21_89_92&products_id=73

http://www.inchwormgear.com/store/product_info.php?products_id=72

THK Matt · « **Reply #10 on:** Apr 17, 2009, 11:29:11 AM »

Thanks!

dniel · « **Reply #11 on:** Apr 17, 2009, 12:10:19 PM »

Quote from: ThatIDAHOKid on Apr 17, 2009, 11:20:34 AM

Awesome!!!! would this adaptor work on a 91 R150F? or you mean late model as in 95+?

Their web site makes it sound like it would work but I'm not 100% sure. Give them a call before you order they are good guys and have excellent customer service.

THK Matt · « **Reply #12 on:** Apr 17, 2009, 04:30:35 PM »

Quote from: dniel on Apr 17, 2009, 12:10:19 PM

Their web site makes it sound like it would work but I'm not 100% sure. Give them a call before you order they are good guys and have excellent customer service.

yeah confused me lol
I will do that.

CrawfishStu · « **Reply #13 on:** Apr 30, 2009, 07:37:06 AM »

How long is the 340F? Are they electronic shift?

THK Matt · « **Reply #14 on:** Apr 30, 2009, 11:46:10 AM »

I thought this was very useful information

http://www.pirate4x4.com/forum/showthread.php?t=587521

"Features that are unique to the Toyota Chain driven Auto T-case:
A340H model has a 2.66 to 1 low range.
Parking pawl located in transfer case, not in the tranny like most vehicles.
Has it's own pan, valve body, servo, and clutch pack that are fed fluid from the trans pump.
Transfer case is hydraulically actuated, high or low range will not engage without pressurized ATF.
Valvebody is electronically controlled by #4 soleniod, located in small pan below reduction case.
Has two separate fluid cavities, the reduction cavity and the chain drive cavity.
Shares ATF with the tranny *in the reduction unit only* the chain drive has it's own fluid cavity that uses ATF and has traditional drain and fill plugs.
Utilizes planetary gears for reduction.
Front and rear outputs are a large 23 spline, flanges do not interchange with geardrive cases.
Does not have a neutral range.
Can safely shift from 2-hi to 4-hi at speeds up to 60mph.

Why are vehicles with the Toyota A340H trans/t-case so gutless?
(Compared to their 5 speed counterparts with the same motor). Normally, an auto tranny both consumes power and mutiplies torque. In the case of the A340H, the power consumption is doubled by the addition of the hydraulic transfer case, which is essentially like having another automatic transmission inline. But the torque multiplication of the single torque converter isn't enough to compensate for the additional drag. A simple though exspensive solution is to replace the hydraulic chain driven transfer case with a gear driven one. Inchworm and Gearslug are some of the only vendors that make an adapter for this application. People who have performed this mod report increased mileage and performance, most likely due to the elimination of the additional drag of the hydraulic t-case. Note that the chain drive case has a 2.66 to 1 low range so going to a single stock gear drive case will lose some gear reduction."

THK Matt · « **Reply #15 on:** Apr 30, 2009, 11:52:43 AM »

So swapping to a gear driven case... will make it to where it's not so damn sluggish

I have decided to keep my auto.

My 91 is up for part out.

CrawfishStu · « **Reply #16 on:** Apr 30, 2009, 02:30:31 PM »

So basically.....
I have a 22re/4speed/dual toy tcase setup.
I can get a 340F and an adaptor from marlin or inchworm.(will either of these work with 21 spline inputs) and keep my dual toy cases.
I can get a bellhousing from a 340F from behind a 22re and use that bellhousing and an 21 spline aw4 transmission from a pre 91 cherokee and an adaptor from AA and then get a dana 300 or atlasII.

I like the sound of getting the 340F. What years/vehicles should I be searching for? Are these transmissions stand alone or will I need anything from under the hood or to wire anything? How much longer than the manual is it?

dniel · « **Reply #17 on:** Apr 30, 2009, 05:19:07 PM »

Quote from: CrawfishStu on Apr 30, 2009, 02:30:31 PM

So basically.....
I have a 22re/4speed/dual toy tcase setup.
I can get a 340F and an adaptor from marlin or inchworm.(will either of these work with 21 spline inputs) and keep my dual toy cases.
I can get a bellhousing from a 340F from behind a 22re and use that bellhousing and an 21 spline aw4 transmission from a pre 91 cherokee and an adaptor from AA and then get a dana 300 or atlasII.

I like the sound of getting the 340F. What years/vehicles should I be searching for? Are these transmissions stand alone or will I need anything from under the hood or to wire anything? How much longer than the manual is it?

You will need to put a 23 spline input in your forward case. I'm assuming you have one in the rear case. The adapter bolts the tranny to the case and there is a coupler that goes from the tranny out put to the t-case input. The coupler is 23 spline thus the need for a 23 spline in put. The 340f never came behind a 22re as far as I know so you will need the bellhousing from a 340h that did. You might also need the torque converter and in put from the h tranny if the two are different.

If you have an auto you can splice the wires to the f tranny and it will shift normally. If you have a manual the best way is probably to control the tranny tiptronicly. Radesignsproducts.com
sells controllers but I don't know anyone who has used one. I will be ordering from them when I am ready to do mine.

CrawfishStu · « **Reply #18 on:** May 01, 2009, 09:01:34 AM »

Can i just get a 340H?

lucky7 · « **Reply #19 on:** May 01, 2009, 09:22:54 AM »

There is one tranny that solves all these issues.I'm running a passenger drop a340f with a marlin adapter and a 4-7 single case.This tranny was only made for 94 t-100's everything wires and bolts up.Good luck finding one but if someone is determined to have one i can get them but thier are'mt cheap

THK Matt · « **Reply #20 on:** May 01, 2009, 11:47:39 AM »

Quote from: CrawfishStu on May 01, 2009, 09:01:34 AM

Can i just get a 340H?

you already have a 340H bro
the Fs were is 95+ V6 trucks and T100s

CrawfishStu · « **Reply #21 on:** May 01, 2009, 01:30:35 PM »

I have a 4 speed manual.

THK Matt · « **Reply #22 on:** May 01, 2009, 02:19:08 PM »

well then the 340H is NOT WHAT you're looking for... the H does not have a removable tcase.

CrawfishStu · « **Reply #23 on:** May 01, 2009, 03:20:29 PM »

And....i'm lost

THK Matt · « **Reply #24 on:** May 01, 2009, 05:45:03 PM »

to put a gear case behind a A340 Auto... you CAN NOT use a the A340H, the auto tcase DOES NOT come off.

dniel · « **Reply #25 on:** May 01, 2009, 05:54:52 PM »

You could use an F or an H. Inchworm makes an adapter to put a gear driven t-case behind both trannys. The adapter for the H tranny is more expensive and harder to install than the adapter for the F. The upside of the H is that it came behind a 22r stock and would bolt up without changing anything on the front of the tranny.

To use an F you would need a bell housing from an H that came from behind a 22r. You might also need the torque converter and input from the H tranny. If the F has a thicker torque converter and longer input than the H then the H bellhousing will be to short and you will need to swap in the torque converter and input from the H. If they are the same between the two trannys all you have to swap is the bellhousing. I don't know if they are the same or not you will have to find this out for yourself. Whether the tranny is driver or pass drop does not matter since you are converting to gear drive cases.

It looks like this adapter from Inchworm would be your best option.

They are calling it their pre 95 auto adapter. It is 550$ but if you get an H tranny this is all you will need. It says that it is available in 21 spline so you should be able to use your duels. To get an H tranny keep an eye on craigs list. Many people swap these out to go to 5 speed manuals and I have seen people giving them away for free.

As for controlling the auto it is controlled by a small computer called a ECT. This communicates with your engine computer (ECU) and speed sensors and tells the tranny when to shift. If you are good at wiring you could splice this into your harness fairly easily. If you are not one of the controllers I mentioned in my other post is probably your best option.

dniel · « **Reply #26 on:** May 01, 2009, 06:13:48 PM »

Quote from: THK90 on May 01, 2009, 05:45:03 PM

to put a gear case behind a A340 Auto... you CAN NOT use a the A340H, the auto tcase DOES NOT come off.

The t-case does come off it is just more difficult than on an F tranny. The inchworm adapter I posted above will allow you to put a gear driven t-case behind an H tranny. The instillation is supposed to be difficult. I have read that on an H the parking pall is in the stock t-case and this must be changed. If you keep everything in order autos are pretty easy to work on And I'm sure inchworm would answer any questions that came up.

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