3.3 Cummins FJ40 Install (1 Viewer)

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Oct 12, 2007
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Greenwood, CA.
I'll start a thread installing a 3.3 Cummins in my sons FJ40. I could use all the help I can get. I'm not new the the Cummins swap since I put a 6BT5.9 in my FJ60 almost 15 years ago. It's been an every day driver since then. Enough with that.

The 3.3 will be married to a FJ60 4 speed transmission and transfer case. AA makes a Chevy Toyota bell housing so I'll need to find an adaptor to the Cummins.

I would like to use a hydro boost for the power brakes, I found a Isuzu alternator/power steering pump I'll try using with the hydroboost.

More to come.
 
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Mar 1, 2012
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Boulder, Colorado
I am going the ranger over drive route on my 76 fj40 / cummins 4bt. This buys me 27% over drive that I hope will be adequate. May be converting the 4:11 diffs to 3:70's as well.
 
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Aug 17, 2010
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Always thought the 3.3 would be a cool project. Ranger torque splitter would be a good option if your budget would allow, although people do complain about how rough they shift.

Taller tires and a 3.7 ring and pinion ratio would probably be enough for my use. With 3.7 gears and 33" tires, you'd be turning 2072 rpms at 55, and 2449 at 65. There are no speed limits higher than 55 mph where I live (Oregon coast), so being able to go 55 comfortably and 65 on the upper end would be ok with me.

Good luck!
 
Joined
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Greenwood, CA.
3.3 Cummins FJ40

Here is the FJ40 and 3.3 Cummins.
May run FJ60 axles with the 3.70 gears.
IMG_2009.jpg
IMG_2011.jpg
 
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Feb 27, 2010
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Sacramento, CA
So the 4.11 gears and axles are going to swapped out with FJ60 axles so it will have the 3.70 gears. Oh yeah btw that is my rig I just can't work on it since I am in Afghanistan for the next 6 month + till I finish up my deployment.
 
Last edited:
Joined
Feb 27, 2010
Messages
35
Location
Sacramento, CA
I'll start a thread installing a 3.3 Cummins in my sons FJ40. I could use all the help I can get. I'm not new the the Cummins swap since I put a 6BT5.9 in my FJ60 almost 15 years ago. It's been an every day driver since then. Enough with that.

The 3.3 will be married to a FJ60 4 speed transmission and transfer case. AA makes a Chevy Toyota bell housing so I'll need to find an adaptor to the Cummins.

I would like to use a hydro boost for the power brakes, I found a Isuzu alternator/power steering pump I'll try using with the hydroboost.

More to come.

*correction* Isuzu alternator/vacuum pump combo to use with the brakes till we figure out the hydroboost brake setup
 
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Apr 2, 2008
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Victoria, BC
4 speed w/ 33s yields 25%ish overdrive and nice gear spacing. I'm happy w/ it for west coast highways and a 350.

Where is the 3.3 happiest? (RPM wise)
 
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Feb 27, 2010
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Sacramento, CA
its peak power is at 2200 rpm, i don't remember its max rpm speed but it probably wont be much higher than the 2200 rpm since it isn't an automotive engine but it doesn't have the industrial injector pump.
 
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High and dry in the desert, dancing between hemisp
cumminscruiser said:
Here is the FJ40 and 3.3 Cummins.
May run FJ60 axles with the 3.70 gears.

I've got fj62 axles under my LX and love them. The added width makes her drive like a modern car on the freeway and she feels much more stable off road due to the wider footprint. I also moved the rear axle back 2" and the front axle forward 9/16" (the most I could while still keeping the factory power steering setup).
 
Joined
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Greenwood, CA.
3.3 Cummins FJ40

For some reason I thought it was an alternator/ power steering pump so its a alt/vacuum pump. I'll put the hydroboos away for now and stay with the stock set-up.

Be safe son.
 
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Jul 17, 2013
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So the 4.11 gears and axles are going to swapped out with FJ60 axles so it will have the 3.70 gears. Oh yeah btw that is my rig I just can't work on it since I am in Afghanistan for the next 6 month + till I finish up my deployment.

Nice rig.
Thank you for serving .
 

DPV7070

ForceFed40
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Jun 13, 2010
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Vestavia, AL
I did a lot of research on this route before deciding to go with a MB OM617 (mainly due to budget, availability, and durability). Check out Phoenix Castings & Machining for an adapter to the 3.3.

http://www.phxgrp.com/gmpowertrain.htm

There's also a guy, "Kleatus," doing a 3.3 swap on the board as well.

https://forum.ih8mud.com/40-55-seri...my-76-40-b3-3-swap-some-general-fixin-up.html

As an Afghanistan vet, I appreciate your son's service. Tell him to keep his head down and get back home.

Dave
 
Joined
Oct 12, 2007
Messages
478
Location
Greenwood, CA.
3.3 Cummins FJ40

Pheonix casting is the next step, just have to buy it. I,ll start with the shifter coming out of the existing holes. Since I've done it twice before the holes just need a slight mod.
 

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