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Old 05-14-2007, 06:34 PM   #1 (permalink)
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Cummins 4BT/700R4 swap

Last month I started a new job after moving out to Colorado. Well, shortly after starting we took delivery of a 92' FJ80 Landcruiser that was in the process of getting a new heart. Well, because of our diesel background, we decided that a Cummins 4BT/700R4 would be the best combo. Enjoy:









There is a pretty good amount of fabwork that goes into installing one these and by Friday we should have everything ready to go. These motors are found in bread trucks, UPS/Fed Ex Trucks, etc. The 700R4 is a new "K" case tranny specifically built for this application. Just to give you an idea, these motors are capable of around 400HP and 500Ft/lbs and get 25-30mpg. This will be a mildly tuned up motor in the 250hp and 350ft/lbs area. And, once we get it going we will be converting it over to run on Veggie oil.

I have done 100% of the fabwork on this rig, and just finished the exhaust today on it. Driveshafts should be in tomorrow, and then we will be plumbing the radiator, brake lines, intercooler lines, and turbo intake.

Here is a pic of a similar install. We didn't do this one, but I wish we had. I just got done installing a new, bigger turbo.


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Old 05-15-2007, 09:38 AM   #2 (permalink)
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sweet! did you post this on www.4btswaps.com?? You should, if you havent'.
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Old 05-15-2007, 09:49 AM   #3 (permalink)
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very cool, been dreaming about that setup.

Not sure on your hp #'s. The 4bt, like 6 were never a high reving motor. They build amazing torque at low rpm which yields misleading low horsepower numbers. Torque is often a more accurate way of comparing motors. After all, you measure torque at a rpm to get horsepower.
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Old 05-15-2007, 10:49 AM   #4 (permalink)
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Not sure on your hp #'s. The 4bt, like 6 were never a high reving motor. They build amazing torque at low rpm which yields misleading low horsepower numbers.
x2. My 6bt only makes 330hp at the tires, but 750 lb-ft of torque..
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Old 05-15-2007, 11:10 AM   #5 (permalink)
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No, he's right about the numbers, just leaving out the MASSIVE AMOUNTS OF MONEY AND TIME it takes to get 400hp out of a 4bt.

Torque is king, as far as I'm concerned. Have you ever seen 200 horses together in a field?? They can do a bunch of work.
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Old 05-15-2007, 11:54 AM   #6 (permalink)
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For retrospect, saw a 7.3 powerstroke 480 hp at rear wheels, 1100 lbs of torque uncorrected at 3500 feet. So I'm very curious how to get 400 hp out of a 4bt. You would have to spin it to 4200 rpm to get that and make 500 lbs of torque there also.
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Old 05-15-2007, 12:46 PM   #7 (permalink)
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Any pics of the interior? I am wondering how you did the shift linkage for the 700R4.
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Old 05-15-2007, 01:51 PM   #8 (permalink)
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Any pics of the interior? I am wondering how you did the shift linkage for the 700R4.
The interior is clean, but pretty plain cloth. We are setting up gauges this week too, so as soon as they are done, I will try to get some pics of it.

The linkage is pretty easy to tell you the truth for the 700R4. The linkage for the FJ62 Splitcase is a different story though. Still not bad, but fabbing is required to make it work correctly.

The 700R4 setup involves just moving the long shift arm from the stock shifter from the Passenger side to the driver's side. And a 2.5" eye to eye lever is installed on the transmission. You also need to extend the shift rod with a sleeve.

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Old 05-15-2007, 02:01 PM   #9 (permalink)
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No, he's right about the numbers, just leaving out the MASSIVE AMOUNTS OF MONEY AND TIME it takes to get 400hp out of a 4bt.

Torque is king, as far as I'm concerned. Have you ever seen 200 horses together in a field?? They can do a bunch of work.
Yeah. The cost involved isn't worth it IMO, but some people just have to have it.

I may be over estimating the 250hp in this particular 80, but I know of a couple that are in that range with a fairly similar setup. This one will get a bigger turbo shortly, and a few more mods. I would say 200hp is more likely. Considering that a stock tuned down motor yields around 105-125hp, adding some minor stuff such as a bigger turbo, bigger exhaust, better intake, etc makes a pretty good amount of difference.
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Old 05-15-2007, 03:46 PM   #10 (permalink)
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The interior is clean, but pretty plain cloth. We are setting up gauges this week too, so as soon as they are done, I will try to get some pics of it.

The linkage is pretty easy to tell you the truth for the 700R4. The linkage for the FJ62 Splitcase is a different story though. Still not bad, but fabbing is required to make it work correctly.

The 700R4 setup involves just moving the long shift arm from the stock shifter from the Passenger side to the driver's side. And a 2.5" eye to eye lever is installed on the transmission. You also need to extend the shift rod with a sleeve.
Do you use the factory 80 shift linkage for the 700R4?
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Old 05-15-2007, 04:18 PM   #11 (permalink)
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I'm curious, anything going to be done to the tranny as far as upgrades?

may have to start looking for a bread truck myself.
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Old 05-15-2007, 06:51 PM   #12 (permalink)
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I like how you did the IC. Where did you get it?

Thanks,
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Old 05-15-2007, 07:56 PM   #13 (permalink)
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Quote:
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Do you use the factory 80 shift linkage for the 700R4?
Factory shifter yes. Linkage itself needs to be modified and moved. This is a 92' FJ80. The 93+ use a slightly different shifter.
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Old 05-15-2007, 08:01 PM   #14 (permalink)
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Quote:
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I'm curious, anything going to be done to the tranny as far as upgrades?

may have to start looking for a bread truck myself.
We had the tranny built specifically for this motor to hold up behind it. Some standard 700R4s just don't work that well behind it. This one has an automatic lockup, heavy duty bands and torque convertor.

The green one pictured last is having issues after only 2000mi. The tranny is slipping and will not lock up consistantly. Likely going to need a rebuild. We didn't do the swap, but have been trying to work with the customer to help resolve the issues he has had with the swap.
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Old 05-16-2007, 11:07 AM   #15 (permalink)
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Thanks, Scotty. I want to do a 350/700R4 in my 80, but I didn't want to get rid of my center console. That's good news on the shifter!
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Old 05-17-2007, 04:16 AM   #16 (permalink)
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How did y'all resolve the torque converter bolt pattern difference between the tranny and flywheel? I was thinking when I did mine to have the shop reweld the tabs to a TH400 pattern.

Thank you,
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Old 05-17-2007, 07:11 AM   #17 (permalink)
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How did y'all resolve the torque converter bolt pattern difference between the tranny and flywheel? I was thinking when I did mine to have the shop reweld the tabs to a TH400 pattern.

Thank you,
That is what we do. Although, Turbo 400s are found behind them in some applications.
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Old 05-17-2007, 07:40 PM   #18 (permalink)
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Guages?

did you get the stock tach to work?
do you have picts of oilpan clearance?
does the earlier 80 series shifter have four drive selections? Or three? My buddy has a 4BT in a '94, but the shifter only has enough selections to drop the tranny into 1-2... not 1-only.

I'm doing a similar swap (well, friend of mine is doing most of it), 1994 80, 4BT, NV4500, Orion. It's tough to clear the front axle... 4BT's are tall. Other issue I'm having is the exhaust. Am using a 6BT manifold, cut down... which moves the turbo forward... but it's still tight. I'm using an HY35W/9CM from a 2004.5 Dodge.
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Old 05-17-2007, 09:00 PM   #19 (permalink)
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Yes, tach will work fine. You have to drill and install a sender at the flywheel/flexplate.

The 91-92s had four position shifters. 1-2-3-D. That is the one we are dealing with now.

Make sure the motor is clocked 10 degrees per spec and you shouldn't have issues at the oil pan. Ours clears fine and so does the D-shaft(barely). It does require a 4" lift though.

I re-used a portion of the stock exhaust from the bread truck. I cut it down, and it went outside the frame rail without an issue. From there we had it mandrel bent to match and installed all the way back with just a straight pipe.

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did you get the stock tach to work?
do you have picts of oilpan clearance?
does the earlier 80 series shifter have four drive selections? Or three? My buddy has a 4BT in a '94, but the shifter only has enough selections to drop the tranny into 1-2... not 1-only.

I'm doing a similar swap (well, friend of mine is doing most of it), 1994 80, 4BT, NV4500, Orion. It's tough to clear the front axle... 4BT's are tall. Other issue I'm having is the exhaust. Am using a 6BT manifold, cut down... which moves the turbo forward... but it's still tight. I'm using an HY35W/9CM from a 2004.5 Dodge.
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Old 05-25-2007, 04:31 PM   #20 (permalink)
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Well, we fired it up today, and dispite only have a 2ft down pipe on it, it was really smooth and quiet compared to the other one in the shop. Still some little things like gauges and alt wiring to handle, but she is very close to done.







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Old 05-25-2007, 04:39 PM   #21 (permalink)
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i can't make out the logo on that sound/heat shield on the firewall...what did y'all use?

the install looks real clean from these pics, nice.

also, is the 4bt mounted with the factory "tilt" to the passenger side? i've heard andre and others mention this, but this is the first time it has been apparent to me.


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Old 05-25-2007, 05:08 PM   #22 (permalink)
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i can't make out the logo on that sound/heat shield on the firewall...what did y'all use?

the install looks real clean from these pics, nice.

also, is the 4bt mounted with the factory "tilt" to the passenger side? i've heard andre and others mention this, but this is the first time it has been apparent to me.


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Yes, 10* tilt is there. I will see if I can get an exact name for ya on the firewall insulation on Tuesday.
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Old 05-26-2007, 07:28 PM   #23 (permalink)
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Its fat mat.
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Old 05-26-2007, 08:53 PM   #24 (permalink)
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I love the set up , very nice how much would something like that cost to be done in a 1980 p/u ??
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Old 05-26-2007, 09:09 PM   #25 (permalink)
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I love the set up , very nice how much would something like that cost to be done in a 1980 p/u ??
About 10x more than its worth unfortunately. Even in the FJ80s, the cost outweighs what you will ever recoup. Unless you run veggie for five straight years......Typical conversion like this runs in excess of $15K. That includes, lift, motor, new tranny, adapters, fabwork, installation, wiring, etc.

I have seen some similar rigs net excess of $25K on the market though after the conversion is done.

In a couple more weeks, this rig will also be getting a new custom SVO conversion to it. Veggie is the answer for a conversion like this.

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