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Old 11-24-2009, 07:17 PM   #1 (permalink)
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cummins into chevy

I bought a 1984 chevy crew cab 3+3 4x4. It has a 454 turbo 400 and a
np205. I want to swap a 12 valve cummins into it. The truck has 4:10's so I would like to have a 5 speed it in for an extra gear for milage. The th400 would be great but the adapter's are expensive and it is not overdrive.

What Is the best way to get what i want on somewhat of a budget?
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Old 11-24-2009, 07:28 PM   #2 (permalink)
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take your time gathering parts, deadlines are expensive. do lots of research on cummins websites where it has been done, like 4btswaps.com. own a lot of tools already so you can do it all the fab work yourself. cheap cheap would be an 89-93 cummins beater with the getrag 5 speed. having the whole truck to swap from will eliminate a lot of scrounging for little parts. good luck from a guy on a similar journey
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Old 11-24-2009, 07:34 PM   #3 (permalink)
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What Is the best way to get what i want on somewhat of a budget?
Bargon shop
Oh and do it yourself.
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Old 11-24-2009, 08:07 PM   #4 (permalink)
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Look in the JY for a 89-93 rolled w250. Has just about everything you need.
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Old 11-25-2009, 12:20 AM   #5 (permalink)
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89-93 12v 5speed (Getrag and passenger drop NP205) for sure. Tight budget and engine swaps don't exist but the drive train in these years is going to be your best bet for saving money. Buy a donor truck and you'll be set...
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Old 11-25-2009, 11:21 AM   #6 (permalink)
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89-93 12v 5speed (Getrag and passenger drop NP205) for sure. Tight budget and engine swaps don't exist but the drive train in these years is going to be your best bet for saving money. Buy a donor truck and you'll be set...
That is what I wanted to hear!! Thanks


Not really tight budget just don't want to have a mint wraped up in it
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Old 11-25-2009, 12:52 PM   #7 (permalink)
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Check out Tennessee Diesel Conversions, Destroked, and the diesel section of coloradok5.com. Also check out cumminsforum.com.

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Old 11-25-2009, 03:32 PM   #8 (permalink)
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I should have started with a crew dually like you. I soon will be cutting my Cummins powered M1008 up and building a crew dually.

There are several ways to do it but I used a Freightliner engine, Dodge NV4500 with a Chevy tail housing and output shaft to work with my round bolt pattern Chevy transfer. I used a Duramax radiator and modified Duramax intercooler.

The 89-93 Dodge engine mounts can be modified and slots cut in your Chevy frame pads for the Dodge rubber mount studs.



more photos:
http://s244.photobucket.com/albums/g...mmins%20M1008/

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Old 11-25-2009, 04:10 PM   #9 (permalink)
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Look in the JY for a 89-93 rolled w250. Has just about everything you need.
Yeah, good luck!!

Find a good used truck that's running, but has a nasty interior and body. There out there, but most are still working everyday. Take your time and find the right truck, as all the little things will be there. Cummins swap's are the way to go!!
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Old 11-25-2009, 10:26 PM   #10 (permalink)
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I plan on doing this build next winter.. I have to finish my scout/buggy this winter. Going to keep my eye's open at the local farm sale's
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Old 11-25-2009, 11:33 PM   #11 (permalink)
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Found you a couple donors. I might have to keep the second one for my self!!
They're both in St. George, UT. You get the Cummins plus some 1-ton axles you can sell or swap.

http://stgeorge.craigslist.org/cto/1462714806.html

http://lasvegas.craigslist.org/cto/1470991604.html
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Old 11-26-2009, 07:07 AM   #12 (permalink)
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Found you a couple donors. I might have to keep the second one for my self!!
They're both in St. George, UT. You get the Cummins plus some 1-ton axles you can sell or swap.

http://stgeorge.craigslist.org/cto/1462714806.html

http://lasvegas.craigslist.org/cto/1470991604.html
Thank's but I am in IOWA
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Old 11-26-2009, 09:57 AM   #13 (permalink)
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Thank's but I am in IOWA
Guarantee they'd make it there.
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Old 11-26-2009, 09:59 AM   #14 (permalink)
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Guarantee they'd make it there.
Very true
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Old 11-26-2009, 09:25 PM   #15 (permalink)
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I have seen it may need a body lift and maybe lift springs.
I also seen a thread on here (i think) that did it with no lift and the guy was selling the cross member for 500.00. Anybody seen such a thing?
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Old 11-27-2009, 06:46 AM   #16 (permalink)
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Yep right here. Thinking of going this route myself.

http://coloradok5.com/forums/showthread.php?t=249756
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Old 11-27-2009, 08:07 AM   #17 (permalink)
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Lift springs depend on how much tire you want to run. I've seen swaps without a body lift, but some of the motor is pretty tight under the cowl.

Avalanche Engineering sells this crossmember to bolt the Cummins into your Chevy. $399.

http://www.avalancheengineering.com/xmember73-91.html
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Old 11-27-2009, 10:38 AM   #18 (permalink)
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What does this crossmember do? Move the motor up down front back???

Also that truck has 5 spring's in the pack the one I bought has 3. Will the motor be to heavy for 3 leaf's? I have a set of 4 inch lift spring's but if I can help it I don't want a lift at all.
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Old 11-27-2009, 11:16 AM   #19 (permalink)
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What tire size do you plan on using with the 4.10's I have a 94 12v in my crewcab with 4.10's and 35's. used to have 31's and wasn't enough at highway speeds so I swapped to 35's I also have a US Gear splitter behind my nv4500. If you can fab I wouldn't waste your money on the pre-fabbed mounts and crossmembers they aren't that hard to make yourself. But I try to strech every dollar. I am in my truck $5500.00 and that includes the price of a 2wd crewcab, motor, trans, overdrive, d60, 205, southbend clutch, guages, exhaust, gov springs, and rims and tires.
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Old 11-27-2009, 11:31 AM   #20 (permalink)
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What tire size do you plan on using with the 4.10's I have a 94 12v in my crewcab with 4.10's and 35's. used to have 31's and wasn't enough at highway speeds so I swapped to 35's I also have a US Gear splitter behind my nv4500. If you can fab I wouldn't waste your money on the pre-fabbed mounts and crossmembers they aren't that hard to make yourself. But I try to strech every dollar. I am in my truck $5500.00 and that includes the price of a 2wd crewcab, motor, trans, overdrive, d60, 205, southbend clutch, guages, exhaust, gov springs, and rims and tires.
I realy don't want much more than stock high tire. Stock tire wind the motor to tight? I kinda thought a 5 speed would fix that problem but I have alot to learn.

I gave 1700.00 for the truck and have the 454 turbo 400 and np 205 sold for 1000.00
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Old 11-27-2009, 11:35 AM   #21 (permalink)
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That link is for 0 lift. Also the one that Avalanch is selling is a copy of the this one.
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Old 11-27-2009, 11:59 AM   #22 (permalink)
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That link is for 0 lift. Also the one that Avalanch is selling is a copy of the this one.
OK but why does it allow you to use 0 lift?
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Old 11-27-2009, 12:01 PM   #23 (permalink)
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OK but why does it allow you to use 0 lift?
I'm assuming for people that don't want to lift their truck
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Old 11-27-2009, 12:46 PM   #24 (permalink)
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with a stock tire you will be wound up tight at 65 and say goodbye to any mileage if you want a stock tire you need around a 3.55 gear ratio IMO I had 31's with the 5speed and the us gear in overdrive and 65 was 1800 with out the usgear in overdrive it was 2200-2300 and I lost about 7mpg with 35's and driving in my top gear (double overdrive) 67 mph is arond 1600 and I get 28mpg
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Old 11-27-2009, 02:05 PM   #25 (permalink)
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How much lift does it take to fit 35's under a 1 ton?
Where can a guy buy this over drive?
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