Chevy Cummins Conversions, Check In Here
 

Howdy folks! Im getting geared up to do a Cummins conversion into my '91 OLD body GMC and im lookin for tips and parts sources. So I kind of want to turn this into a "Chevy Cummins conversion source's/tips/tricks thread"

I'll list the links I have when I get on my other puter later. Thanks guys!
:pca1:

I'm going to do the same thing in my Suburban. Engine mounts and accessories, Trans adaptors. I'm going to run the 4L80E and use a PCS controller, and have These guys help build me a trans. I'm going to run a spearco intercooler in it as well I hope.

You might want to think twice about using the 4L80E. It wont even remotely hold the power of a stock Cummins for very long.

They are stronger then people give them credit for. You just have to build them like anything else. Suncoast even told me they are just as stout as a 47re when they are both built.

When BUILT, not when run stock.

I've heard both sides of the 4L80 holding up or not...personally I'd rather use a Goerand 47re but be sure to keep track of everything you do with the 4L80, I'm interested to see how well it holds up.

does anyone make a low stall billet converter for the 4L80e's?

Yes, there are several companies that do.

I want to keep everthing inside the truck looking stock and not have to modify my driveline. I dont see why a 4l80e would not hold up to a stock cummins when they dont put that much down. My 24v only put 194hp to the ground and I know guys running 6.5s at 250 or so and they are holding. We will see, I like the way the 4l80e acts alot better then the 47re personally. They guarantee me it will hold 600hp and a 1000+ pounds of torque so we will see.

Get the guarntee in writing and don't lose it. Gone thru to many auto's behind my CTD that all had promises that fell thru:baby:

ditto. and make sure they know peak torque is gonna be real close to 1,000 rpm!!

I am going to be mighty interested in this thread, since I am going to put a Cummins 5.9 ISB in a 99 GMC sometime in the near future. The GMC currently has a 4L80E tranny and a 454 Big block. It is a 3500 HD Mega Cab with an extended frame (wrecker frame) and a 11 foot Wilco bed. The truck has been hauling my 33 foot 5th Wheeler, my 38 foot boat and my 28 foot travel trailer, with the current set-up, but only gets 7mpg when hauling and 9 empty. Hopefully the CTD will solve that, and since the engine is a 300HP that came out of a Topkick, it should be one of the SIMPLER conversions.

Well I may just install my 6.5 and auto in the dump truck and put the NV4500 and Cummins in the Burban. I'm still trying to find an engine right now.

For a project down the road I want take a 79 ford 1 ton and put a built 12v but thats way down the road.

hey i have a 1996 gmc sierra 1500 and i want to put a diesel in it, will it fit and wat all shuld i do to convert it to a diesel and wats the largest engine i culd put in there

You'll pay hell to get that front end to hold a 5.9 Cummins and that 1/2 ton frame won't be very happy. The 4bt might even be a stretch. If you converted it to a solid axle or got aftermarket front end parts that are the equivalent strength of the 3/4 GM front end you might have a shot but I think the frame still wouldn't like it very much.

GM put the 6.5 in 1/2 tons for along time. If you're looking for a diesel and don't need to make a ton of power try looking for a 6.5 to put in there. They're not as bad as their reputation makes them out to be.

so wat culd i do to the frame to be able to stand all that power and wat ur saying is that id have to put new front end parts on it y wuild i have to put new front end parts on it. o and wuld the 6.5 bolt up to the stock tranny i already have or wuld i have to replace that and the drive shaft and the gearing in the dif.

cummings swap
 

hey guys. im seriously thinking of swapping my 454 out of my 74gmc 1ton and putting a cummings 12v in. what year engine would be the best? and how much of a headache am i asking for? thanks!

If your looking for the easiet year CTD to put in it would be a 89-98 12V, if you didnt need any gauges or accessories, all you need is 12 volts to the starter and some fuel..the older Chevy/GMC like your '74 1 ton seem to have alot more room in the engine bay, I think it would a lot easier to do a 12V swap into an older truck than even my '95 Chebby...

I am looking into installing 5.9 in 87 1ton crew cab infront of turbo 400 with gearvender lil worried about 400 help

torque
 

I think if you stay at stock hp around 180 in 5.9 you,ll be just fine with 4l80e with good shift kit, there is a stand aloan allison that adapts in nicely lil spendy, for all around 8k but told you wont be changing trany out if you deside you want lil more hp

my 1988 chevy crew cab 4x4 with built 400th tranny didnt hold up behind stock 5.9 cummins 2 much torque and I didnt use it 4 towing much only daily driving. Went with chevy nv4500 dodge input shaft clutch flywheel chevy 205 transfercase with gearvendor overdrive unit on back. 80 mph 1600 rpm with 4.10 gears. chevy auto might hold up behind 4bt cummins

i have a 2001 chevy silverado ext cab z71 i am putting a cummins into the only thing i had to do is put 3/4 ton torsion bars and the keys to hold the weight of the 5.9 just havent found a conversion kit to hold the motor in place im going to back it with a allison tranny with a ats five star torque converter the rest is going to be the fun part

The allison is a good transmission and I don't mean to knock it, but as far as cost goes, a Goerand build Dodge auto "only" runs about $5000 and that includes billit input, upgraded shell, sprag and tripple clutch billet converter. There is a $1000 core, but you can buy a used/burnt up core for much cheaper then that to ship to them, and end up with one heck of a trans for around $5500 shipped. I seriously considered a built auto and weighed alot of options, TH400 with gear vendor, Allison, built Dodge, 4L80E but in the end, wound up going Manual. If I had gone auto I would have gone with a Georand Dodge trans because I KNOW they are reliable and will survive behind my compound turbos Cummins and as far as strength goes, they were the best bang for the buck. To each his own, so make the decission for yourself, but keep in mind that the Cummins has HUGE torque potential and it is all to easy to turn it up a notch. So whatever you decide, make sure that it is not marginal in strength. Build it stronger then you ever thought you would need it to be, because once the horsepower bug bited you, you could end up like I did... With a heavily fueled, heavilly modified, compound turboed, beast of an engine that just loves to eat transmission. Just my 2 cents.

As near as I can tell, I am the only guy in the country building late model Chevy conversion motor mounts. You won't be able to use the ATS converter because it has a stall speed that is 700 RPM'S too high.

autoworldmt.com makes motor mounts for the chevy cummins as well. i got mine through them it was a great setup with a very easy install

They don't make late model conversion motor mounts.

they do up to the 2000 classic style. do you got nay pics of the mounts you build? im curious to see em. gettin ready for another project so i will keep your mounts in mind if i like em

The late model mounts use O.E. Dodge common rail insulators and castings. These mounts are far stronger than the ist gen Dodge insulators.

how many vehicles do you make conversions for? just late model chevys or more?

Quite a bit more, What are you looking for?

checking in. I fabbed all my shit.

'95 12 valve, chev diesel nv4500 w/cummins input + bellhousing + hydraulics, southbend, pass drop np241C, pass drop D60

not anything in particular yet just like to know my options so i know what to plan when i start a project

im currently swapping a 90 dodge ctd into an 85 k20 build thread here- 85 Chevy K20 6bt swap (work in progress) - Cummins 4BT & Diesel Conversions Forums

Very nice work, looks like a fun project.

Going for my '92 3/4 ton Dodge Cummins to put into my '02 1/2 ton Silverado. I'll probably end up going with a 3/4 ton frame though, because I won't have time with school and work to build up the 1/2 ton frame:dang:.

thank you!:c:

Im wanting to do a CR Conversion on my 02 Denali quadrasteer. I would love to pick your brain about whats all involved. Especially with getting the elctronics to work together(gauge cluster, ect.)

i am lookin to buy some mounts to put a 1st gen ctd in my 87 chevy one ton 4x4 dually how can i get some and how much email me at iceman_us_3406@yahoo.com thanks

quality parts
 

my first post on what looks like a pretty good site. :hellox: I live in the northwest and have done afew conversions. one project we bought parts from back east. it looked like 1/4" scrap metal wirefeed welded. it didnt last long with the power we put out. I have bought the engine mounts from autoworld in montana. they are far stronger, extra HD. the bushings are made using neophrine not stock rubber. they have an exclusive on it. the parts I have bought are high quality stuff. they are water jet cut and tig welded by ken himself. I am helping on a 2002 1ton 4x4 in lewiston id. ken has done the r&d and has made the proper mounts, and other pieces we needed. I was in his shop afew weeks ago, he was finishing up on a 4bt in a chev pickup. I have been at this game awhile now. for what its worth, give ken and dawna a call. they have been at it for 15+ years. just my 2cts, I dont work for them.

You can give me a call anytime.
-Paul
507-330-3567