3.4 dohc swap to a volvo 740!

[GrandPrixGTP2000]

Hey guys!

Well my friend has a 1990 Volvo 740 sedan, he had blown the engine, any way we were thinking about swapping my 3.4 out of my old gp I wrecked and putting it in his Volvo. I had some questions (if this is even possible). First would his tranny in his Volvo work on it? I know that I will need the computer, wiring and all of that. The biggest thing on this is if the trans will work or not? Any help would be appreciated! Thanks guys!

[SappySE107]

adapt the bellhousing if necessary, sure. Worth it? absolutely not.

[Superdave]

Those are RWD right?

If so I have a 700R4 that will bolt right up to your 3.4 DOHC, all you'll need to do is grab a torque converter for it. Has a modified TransGO shift kit from Probuilt Auto and a Corvette Servo already installed.


Could be a fun project if there is enough engine bay room for that big DOHC.

[TurboGTU]

The ZF4hp22 automatic in the volvo is a POS. Save for the 700r4 or 4l60 that will bolt up. You also need a Yoke from the doner trans to mate with the new drive shaft you need to make.

[Nas Escobar]

Hmmm this is a first... usually people run away from the LQ1 unless you have a Fiero.

Anyways, the best way to do this would be to swap everything GM power component into the Volvo. An RWD GM trans (because the 740 was RWD), a bellhousing that will bolt the 3.4 to the new trans, computer, and all wiring. It would get tough with the gauge cluster and you would probably need your own motor/trans mounts, but other than that I don't see why you shouldn't do it. As others have said, the 700R4 or a 4L60 would be a good choice. Don't get the 4L60E since that relies on the PCM/ECU to work. The 700R4 would probably be the easiest to do. You would probably have to gear the rear end of that Volvo to accept the 700R4 though. I don't think that would be plug in a new yoke and drive.

As always post pics or it didn't happen!

[pocket-rocket]

Don't get the 4L60E since that relies on the PCM/ECU to work.

The stock ECM from a DOHC car could run it just fine. The auto that came with most DOHC was a 4T60E.

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[Nas Escobar]

The stock ECM from a DOHC car could run it just fine. The auto that came with most DOHC was a 4T60E.

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If I'm not mistaken that was the only one that was available. Wouldn't the ECM make the trans shift funny though? I would think that the 4T60E and the 4L60E are geared very differently.

[pocket-rocket]

If I'm not mistaken that was the only one that was available. Wouldn't the ECM make the trans shift funny though? I would think that the 4T60E and the 4L60E are geared very differently.

They may be geared differently, but that could be taken care of in the ECM easy enough with a chip burner.

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[robertisaar]

4L60E has a pressure control solenoid, 4T60E doesn't. while the code COULD be adapted to control it, kind of a pain to do.

[nonhog]

Plenty of Volvo guys adapting GM auto's to the Volvo plant. That tells you something right there. GM trans will fit with minor massage work. (small sledge)
I have a 4RW70 (Ford) in a Volvo. That's as big or bigger than a 700R4.

[robertisaar]

i seem to remember volvos of that vintage having overly strong manual transmissions? am i remembering this wrong?