Topic: 1998 T100 MANUAL to AUTOMATIC swap

[nut]

Hello all, I've been trolling the forum for awhile and just now registering. Lot's of good info, thanks for what y'all do.


Anyways, I've searched for this trans swap and I don't see anyone talking about the computer or drive shafts... or have completed projects

I have a 98 4x4 T with I believe the R151 and picked up an A340 from a 97 4x4 4runner. I'm in the middle of a move to Arizona and the A340 is in storage out of state so I cant put  eyes on it.

It appears the A340 will bolt up, but I may have to swap the T-case, does that sound right?

Do I need to get a computer from an auto truck? Will both Dshafts work (I know this is easily remedied if not)?

Thanks in advance

[Team_Jake]

I did the exact opposite of you, swapped a 5-speed into my '99 4runner.
I will tell you right now going from Auto to Manual is easy, going from Manual to Auto will be tough.

The manual transmission you have in your T100 is an R150F, the R151 only came on the 22RE Turbos. The A340F will bolt up no problem. The transfer cases don't need to be swapped, all 5VZ transfer cases are swappable.

The R150F is ~1.25" shorter than the A340F (depending on the year). If there is enough travel in your slip joint in your driveshaft you won't need to find another driveshaft.

Yes you absolutely need the computer from an Auto. This will be the hard part, finding the correct computer and wiring the Auto transmission properly. There are 4 or 5 electrical connectors that need to be hooked up. The easiest thing to do is to find a wiring harness and swap harnesses with your truck. Then you need to swap your radiator to run the transmission fluid cooler lines (or make a transmission fluid cooler of your own). You'll need to plug the hole where the clutch goes through the firewall, and you'll need to plug the hole in the center console (and I want to say the Autos in the T100s were column shift so you need all those parts, but I could be wrong). It'd be a lot of work.

...

Out of curiosity, why would you want to switch from Manual to Auto? Most guys (including myself) prefer a manual (hens why I did the swap). If you want an Auto T100 have you considered buying one and selling yours?

[nut [OP]]

Hi Jake,

Thanks for the info. I've had the truck for 15 years. I put a TRD supercharger and a URD 7th Injector on it. and I've put 130,000 miles on her. I just can't part with it.

I like to play in sand and it's just not as enjoyable to me with a manual. I want to end up with long travel suspension as well.

Right now the trans is in need of rebuilding. The synchros seem to be gone. Will not shift into gear unless the truck is off and stationary. The clutch is in perfect condition (stage 3 from URD, way overkill).

I think I could make the floor shifter work for the auto. I want a new single piece driveshaft anyways so that's not a big deal. Really its the wiring harness and computer that will be the hangups... Would someone who has done the opposite be able to swap computers without issue? Would that be a win-win?

[gnob]

The manual and auto ecus are pinned differently. There is no plug and play solution.
You will need to source the ecu and engines harness together.
Probably best to see if you can't find a totalled t100

[nut [OP]]

Thanks. I'm going to start looking for one...

[ryantowry_81]

have you talked with RAD designs? he has done a lot with control of the A340 transmissions and might have a stand alone controller solution for you to keep you from needing to change the ECU?

also we need some pics of said truck. I love some T100's!!!!

[nut [OP]]

Have not heard of RAD, are they on this forum?

I'll get some up. When I bought it in 2006 (I was 18) I put a 3in body lift to accommodate 35's because thoughts weren't thunk so smartly, so don't judge me lol.

[redneckcustoms13]

http://www.radesignsproducts.com/home.html

[nut [OP]]

Thanks!!

[nut [OP]]

Sent an email to RAD, he called me 5 minutes later. They have a pretty good solution it seems :

http://www.radesignsproducts.com/vx-floor-shifter.html

Its a Manual Automatic shifter, $425 for my application. He also recommended a Transco Shift Kit for the A340. It'll be a couple months before anything gets done, but I am pretty motivated knowing this shifter is out there.

If anyone has any input on torque converters for that A340, please let me know.

Thanks

[Jaymz11]

i will be doing a swap soon and all my auto gear will be up for sale