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Old 10-06-2010, 07:08 PM   #1 (permalink)
b1jetmech
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93' Suburban Cummins 4BT swap

A couple of years ago, I swapped in a 105 horse Cummins 4BT into a 93' burb 4x4. Here is how it went.

The burb' before conversion.


The 4BT out of GM stepvan.


A built 700R4 that would accommodate the 4bt.


The 4bt's flexplate has TH400 bolt pattern.


The custom converter I had built had the mounting pads located further out.


Converter had a carbon fiber clutch to allow slipping without burning.


Work begins, Rip N' Tear!


Out with the old tired 350...


Motor and tranny mated and ready to go in n' out for numerous fit tests...


In with the Cummins.


AC bracket to mount AC compressor higher up. I used a dodge AC compressor.


The alternator and AC compressor with belt. I ended up using the factory alternator wit a dodge 5.9 pulley(not pictured)


Hmmmmm, AC compressor interferes with 4bt's horizontal oil filter. Had to switch to dodge 5.9 vertical(not pictured)


Because this is 4wd with no lift/body lift the oil pan would have to be modified from this...


...to this
It increased oil capacity from 10 to 12qts!

Continue...
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94' Burb' 6.5 diesel conversion
Engine: 1994 6.5 non Turbo- mechanical pump.
Transmission: 700R4
Single thermostat w/HO water pump
A lot easier then a Cummins swap...I know because: http://www.dieselplace.com/forum/sho...d.php?t=392580

6.5 swap build thread: http://www.dieselplace.com/forum/sho...d.php?t=414585

The Wife just doesn't understand!

Last edited by b1jetmech; 10-06-2010 at 07:25 PM.
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Old 10-06-2010, 07:10 PM   #2 (permalink)
b1jetmech
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...Continued

Motor mounts were a breeze. had to lower the engine an inch and raise tranny an inch at it's mount.


After a few removals and hachet jobs the oil pan cleared the 4WD third member.


And now the video.

http://www.youtube.com/watch?v=uV903Ai7Uhg

It got 26 MPG and ran great! Only problem was it vibrated too bad at idle to the point it chattered your teeth like Shaggy getting scared by a ghost. If I were to do it again it would get a 5.9

It was a complex swap so I'm happy with a 6.2/6.5 because it makes swapping easier.

Enjoy,

Chase
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94' Burb' 6.5 diesel conversion
Engine: 1994 6.5 non Turbo- mechanical pump.
Transmission: 700R4
Single thermostat w/HO water pump
A lot easier then a Cummins swap...I know because: http://www.dieselplace.com/forum/sho...d.php?t=392580

6.5 swap build thread: http://www.dieselplace.com/forum/sho...d.php?t=414585

The Wife just doesn't understand!

Last edited by b1jetmech; 10-06-2010 at 07:11 PM.
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Old 10-07-2010, 09:52 PM   #3 (permalink)
Oregonnovaguy
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Nice work. So is the vibration typical for the 4BT, or are you just lucky, or is something else going on?
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Old 10-07-2010, 10:02 PM   #4 (permalink)
mannytranny
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4BTAA vibrates less!

26 mpg though....that's sweet! How is the power compared to the 350?
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Old 10-07-2010, 10:32 PM   #5 (permalink)
BombDocDiesel
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Awesome build!!
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Old 10-07-2010, 11:34 PM   #6 (permalink)
b1jetmech
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Quote:
Originally Posted by Oregonnovaguy View Post
Nice work. So is the vibration typical for the 4BT, or are you just lucky, or is something else going on?
Thanks!

...and YES! These 4BT's vibrate. One way to remedy it is to use liquid mounts that comes in some stepvans. I couldn't use them because the frame is too narrow. That's why I mentioned just going with a 5.9 because they are naturally smooth because of inline 6.

Quote:
Originally Posted by mannytranny View Post
4BTAA vibrates less!

26 mpg though....that's sweet! How is the power compared to the 350?
Performance was almost same off line but the 350 would have walked away even if a higher rpm governor spring was swapped in. The only mods was a fuel pin and H1C turbo and pump turned up 10%.

Quote:
Originally Posted by BombDocDiesel View Post
Awesome build!!
Thanks!
__________________
94' Burb' 6.5 diesel conversion
Engine: 1994 6.5 non Turbo- mechanical pump.
Transmission: 700R4
Single thermostat w/HO water pump
A lot easier then a Cummins swap...I know because: http://www.dieselplace.com/forum/sho...d.php?t=392580

6.5 swap build thread: http://www.dieselplace.com/forum/sho...d.php?t=414585

The Wife just doesn't understand!
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Old 10-17-2010, 04:00 PM   #7 (permalink)
F.B.I
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HOLY COW ! that kind of mileage is pretty nice for a suburban !
I wish have one of these 4bt for my jeep willys
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Old 10-26-2010, 04:56 PM   #8 (permalink)
76GM4x4
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I just picked up one of those 4bts out of a step van, has GM 72 up style mounts, looks like you had solid mounts? Thinking i might sell mine
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Old 11-30-2010, 12:10 PM   #9 (permalink)
jkidd
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Its so easy to get some extra power out of the 4bt.
Injectors that add 40HP are about $200 and you can get a fuel pin and governor spring to add 40HP and 500RPM for under $150.

the cummins will then easily outrun a 350, and have as much torque as a lot of 454cu in

Also get a fluidampr to reduce the vibration.
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Old 12-18-2010, 02:13 AM   #10 (permalink)
heavyhauldad
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Do you think this would do a 6.5 1 ton any justice? My 6.5 is running on its last few thousand miles. Would a 4L80E mount up to a 4bt?? I barely scrape by with 13 mpg as it is.
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