kctango

Well, he finally proved me wrong when I told him toyotas runs forever, he heard that part and not the rest of the sentence. Run forever given the proper maint. ie oil.
My son called me to say his 4runner was running bad and he left it at a friends house. WHen I pushed for info the story kept changing the story to it was also the trans having problems. So I told him I was coming to get the truck and not to abandone it at his friends. After a all day of work and then driving 1600 miles, 800 there and 800 back all straight through I found out what was the issues with his truck were. NO OIL!!!!! So now his 3.0 has a real nice knock to it. So I started to read and research that the 3.0 isnt worth fixing and or replacing. So now its swap time.

kctango

I done alot of reading throughout this forum and figured I am ready to take the dive into this swap.
First have I every done a engine swap. Yes and no.
Yes I have done american made swaps. I am currently doing one on my 1983 Jeep Scrambler swapping in a 4.0 inplace of the 4.2. Fuel injection over the carb. But thats another forum.

kctango

Here's the plan....
Remove exisiting 3.0 engine......
Keep existing transmission...

I have located and purchased a 1998 3.4 V6 out of a 4Runner with 115,230 miles on it. Vehicle was wrecked in a rear end collision.

So from What i've been reading is this motor will bolt right in to the existing mounts and up to the existing transmission.

I have located and purchased an ECU from a 1996 T100 3.4 6cyl, 4x4, AT. which will operate the existing transmission.

kctango

I will pull a wiring harness this weekend from a upullit yard. Will ensure 3.4, AT, 4x4.
Will get a couple of crossover pipes to work with.

Anything else you can think of while im there?

MaK92-4RnR

Offroad Solutions and Toyota only swaps will be your best friend.

kctango

Just got home to examine the 3.4 motor that was delivered to my house and I was told that it didn't have a good wiring harness that it was cut. Guess what were they wrong its complete and all cuts were on the other side of the plugs. The person who pulled did it right so one less thing to get tomorrow at the junk yard.

kctango

Things now on list for tomorrow to get
Power steering pump w/pulley
Starter or will the one off the 3.0 work?
Altenator w/pulley
A/C condenser w/pulley

SacRunner

The general consensus is to match the starter to the flywheel (with 5 speeds), but I've read of some guys using the 3.0 starter with the 3.4 flywheel, so you may get lucky and find that the 3.0 starter could work with the 3.4 flex plate (for the auto).

You can use the 3.0 alternator (it's only 60A vs the 3.4's 90A output) but you will need to get create with the mount; search for Elvota's swap thread on here, he was one that kept his (modified, high output) 3.0 alternator.

If the truck currently has a good A/C charge, no need to swap the compressor, you'll just need the pulley and shims from the 3.4 a/c compressor. Random side note, the compressor bodies should be the same I gave a buddy the compressor body I got with my 3.4 to install on his 91 land cruiser, he had to swap his pulley and "top plate" (where the A/C lines connect) over, but everything mounted up just fine.

kctango

SacRunner, thanks for the info, this is the kind of help I am looking for. I will look at the compressor before I go to the junk yard but its only 20 for the A/C at the yard. I would have considered a 5spd swap if it was my vehicle but its the sons and when he tried to learn on my jeep it was a nightmare. So its an auto for him.

kctango

Well just got back from the you-pull-it yard.
Items pulled for the swap.
Power Steering pump with pulley and brackets from 1997 t-100 3.4
Starter from 1998 4runner 3.4
alt w/ pulley and brackets from 1998 4runner 3.4
I will wait on the a/c compressor

also picked up rear bumper for his 4runner and right rear tail light
damage to wallet grand total of $128.00
not to bad....

kctango

Quick help from someone


What size bolts are needed to mount the 3.4 engine to an engine stand.

david braun

So you want to use the stock A340H auto with the 3.4? yes it will bolt up but it was not made for the power of the 3.4. Also something else to think of, i had that swap (3.4/A340H combo) and it was a nightmare due to the rear speed sensor on the transmission the ecu will not receive the right signal something about wave lengths old "analog v.s. digital" i believe and will throw a PO1700. 5 months after my swap and a rebuilt trans the solenoids went out and clutches started slipping in which case i did the 5 speed swap.
Big power difference, for your son i would stick to the A340F much better trans and it will handle the power much better it also has a divorced transfer case i believe? but its much better then its predecessor. The 3.0/a340h combo is the worst thing in history imo that Toyota ever created.

For a 5 speed swap just get everything 3.4 for the clutch kit including the flywheel you will need flywheel bolts because the flex plate bolts are not long enough. The 3.0 5 speed stuff is all smaller and weaker the only 3.0 part you need is the throw out bearing! everything else can be 3.4 also don't for get the obd2 plug! code readers will be your friend once its running rich or lean

kctango

Did you use the 95-98 T100 ECU in your swap?

david braun

That i did not, i guess the T100 ecu's still have the analog wave lengths design. I still have the code and always will till i swap over to a manual ecu but for now mines still a 98 out of a Tacoma auto ecu. i just don't like that trans for how much power it takes away from the engine how weak it is pared with the 3.4 and pain in the ass to work on.
Just thinking while your swapping out for a better engine why not a better trans?

scuba

If you're talking about using the A340F from the 3.4, one issue is that the transfercase attached to it will have the front output on the wrong side.
And no, the Tcase is not divorced. You might be thinking of a Landcruiser.

You can use an adapter to put the 3.0 tcase on the A340F, (Marlin, Inchworm, TG) but that is just more money to spend.

david braun

Thanks for the correction, i was not sure but does it share the same atf fluid as the a340h? Should have said that instead but that would be your best option imo to go the route scuba mentioned.

kctango

Here's a few pics of the going ons.
Here's the 1998 3.4 out of the 4runner 115k miles on it, nice and clean.

kctango

kctango

Started on the crossover.

kctango

Making thee cuts to late to stop now.