Hello and help me - Dodge Cummins Diesel Forum
89-93 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #1 of 13 (permalink) Old 04-18-2019, 11:58 PM Thread Starter
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Hello and help me

Ok first off thanks for any and all advice. I am new to this forum and am not an experienced mechanic and I don't know anything about what I am about to do.
My best friend recently passed away and left me his 93 Chevy Suburban K2500 so I have an interesting platform for a Cummins swap. I have picked up an 89 1st gen to put into it from what I know the KDP has been fixed there is a Denny AFC delete done, fuel pin and 3200 spring installed. I don't need to go crazy on this build the truck will mainly be used as a daily driver and for pulling my holiday trailer, however I do wish to build this truck as a tribute to my dear friend. So that being said will the 4l80 tranny hold up to the 12 valve? Should I swap the rear end? What gearing would you guys shoot for? Currently has 4:10s?

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post #2 of 13 (permalink) Old 04-19-2019, 12:24 AM
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Originally Posted by FatJudy View Post
Ok first off thanks for any and all advice. I am new to this forum and am not an experienced mechanic and I don't know anything about what I am about to do.
My best friend recently passed away and left me his 93 Chevy Suburban K2500 so I have an interesting platform for a Cummins swap. I have picked up an 89 1st gen to put into it from what I know the KDP has been fixed there is a Denny AFC delete done, fuel pin and 3200 spring installed. I don't need to go crazy on this build the truck will mainly be used as a daily driver and for pulling my holiday trailer, however I do wish to build this truck as a tribute to my dear friend. So that being said will the 4l80 tranny hold up to the 12 valve? Should I swap the rear end? What gearing would you guys shoot for? Currently has 4:10s?
as far as the tranny, ya'd need adapters and then it would be marginal to make a swap as simple as possible and more reliable ya'll be better off putting an auto behind it that doesn't need any adapters.. the simplest would not be the best that being a 727 I'd go newer and add a stand alone computer to control a later model lockup capable auto... that ya will here plenty from others I'm not a fan of auto trannys so most everything I've done has involved a manual tranny.. As far as getting the 12 valve in go find a first gen truck in a wrecking yard and start taking alot of measurements I'm a welder/fabricator primarily so I tend to build all my own parts, your going to want to duplicate the first gen mounting positions in the 2500 frame and it wouldn't be a bad idea to box the front of the frame while your at it so it will better handle the torque, also if its 4x4 make sure your looking at a passenger side drop for t-case the rest is just a matter of a couple custom drivelines oh.. and mating the Dodge AC to the chevy system.. only takes 2 wires to run a first gen... 1 to power the starter and one to power the FSS to shut it down.. a doner truck makes conversions 300% easier than just starting with an engine BTW the 93 burb has that low sloped hood that causes them to need the squaty side post battery ya wanna be sure the 12 valve will fit under it.. I'm sure it will after all a few people have stuffed em into Dodge magnums just lowwering the engine mounts some and a custom oil pan and pickup
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post #3 of 13 (permalink) Old 04-19-2019, 12:31 AM Thread Starter
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I had found a place that has the trans adapter and mounts for the conversion and I understand I will need a new torque converter from what I have read. I do actually have a big block 727 but that's going in my car once that engine is built. Unfortunately a donor truck is out of the question with two projects on the go I can't be bringing another truck home the wife would kill me lol.
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post #4 of 13 (permalink) Old 04-19-2019, 08:37 AM
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The 4l80 will hold up to the 12v and you'll just need to get the adapter, flexplate, and i'd do a upgraded torque converter. The Company that made the Standalone Controller that I used on my Blazer swap also makes one for the 4l80, Gm Transmission | E-TransControl .

Have you looked through the https://www.cumminsforum.com/forum/c...s-fabrication/ , there have been 12v's put in GM's of that style so it can be done.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

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post #5 of 13 (permalink) Old 04-19-2019, 09:35 AM
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see I knew onea them auto fans would be right along ya can squeeze a 12 valve into some surprising places "ONE OF WON customs" does some really nice conversions here are his Dodge charger and a Caddy

https://www.duramaxcamaro.com/completed-work

the link 9297 provided is a 4BT into a 94 burb, my 96 burb is pretty tight especially under the front part of the hood but its only got an LS3 transplanted into it so I was staying with the small block theme (and yea its got the 4l80 auto (USA built 1500 had 4l80 Canadian built ones got the 4l60) my biggest challenge with the LS3 going into it was the hood angle as it severally restricted the intake I could use a 6BT that 38" tall engine even the 454 which is a really tight squeeze in the 93 body style is 33" tall the hood height will be the biggest challenge as the hood angle is so tight at the front, if its a 4x4 then it becomes a real issue with the oil pan and the front IFS ya could put a lift on it and try to get that IFS assembly down some.. the 6bt is 10" longer than the 4bt which allows the 4bt to sit back pretty much eliminating the hood angle issue...
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post #6 of 13 (permalink) Old 04-19-2019, 09:40 AM
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see I knew onea them auto fans would be right along ya can squeeze a 12 valve into some surprising places "ONE OF WON customs" does some really nice conversions here are his Dodge charger and a Caddy

https://www.duramaxcamaro.com/completed-work

the link 9297 provided is a 4BT into a 94 burb, my 96 burb is pretty tight especially under the front part of the hood but its only got an LS3 transplanted into it so I was staying with the small block theme (and yea its got the 4l80 auto (USA built 1500 had 4l80 Canadian built ones got the 4l60) my biggest challenge with the LS3 going into it was the hood angle as it severally restricted the intake I could use a 6BT that 38" tall engine even the 454 which is a relly tight squeeze in the 93 body style is 33" tall the hood height will be the biggest challenge as the hood angle is so tight at the front, if its a 4x4 then it becomes a real issue with the oil pan and the front IFS ya could put a lift on it and try to get that IFS assembly down some..
That 4bt is in the 4bt Conversion Section there are some in the 6bt section also. Pretty sure the Pickups and Suburban are the same body and I know there are Pickup's with them.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
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post #7 of 13 (permalink) Old 04-19-2019, 09:58 AM
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yea the same front clip the burb is a pu with a permanent camper shell, is how my sister decsribes mine which I just gave her a few weeks ago, gonna have to look at some of those 6bt into that body cause I bout killed myself trying to get a decent intake to sit under that hood with the LS3 almost swapped the hood for an aftermarket one with tall cowl scoop
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post #8 of 13 (permalink) Old 04-21-2019, 03:01 AM
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If you don't go 4l80e And stick with a dodge trans I would go with a 47rh Lock up converter would be Super sweet compared to a 727 .

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RIP Speedy the 67 vw died a very hot Death 5-17-2010 New toy 1985 crewcab longbed 4x4 conversion with a 93 cummin's and built 47rh with compushift mini controlled auto sxe62/70 turbo 6x13 injector's full 4 in Diamond Eye Exhaust ,366 spring and THD fuel pin .along with Boost and Pyro gauges and Tach .
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post #9 of 13 (permalink) Old 04-21-2019, 06:08 PM
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I think it would be a mistake to believe an adapter and standalone computer on a 25yo trans (that was never built for cummins torque) is a realistic scope for the project. You may want to add 'GMT400' into the google bar when you're searching cummins swaps.

IMO, better to buy a whole running/driving Dodge with the powertrain you want, and do as complete a transplant as you wish. Sell off the rest. My vote is for a manual trans to avoid the computer issues entirely. Use a clutch pedal from a similar year pickup as the Suburban. Might have to go to a taller axle ratio (3.42?) to have some highway legs (or bigger tires).

I do miss my Suburban... an '84 w/6.2L. I managed to convert it to manual (4spd), 14bFF w/3.21 ratio, and JB8 brakes (both ends) before losing it in my divorce. Sometimes I toss the idea around of making my Ramcharger a 4dr.

93 W250 Club 6BTA |5spd |60/80/3.54/Lockright |4" lift |315/75R16 |HX35 |5x.012s |BD pin & gov spring
84 Ramcharger (project) 6BT |5spd |WH1C| D70/3.07 ...plus a few other 75-93 D/W trucks
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post #10 of 13 (permalink) Old 04-21-2019, 06:32 PM
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need a HD 5 speed tranny minimum to hold up to the Cummins torque. 5 forward to cover the limited rpm torque range of the 6bt
NV4500 with HD single disc clutch.

easy to add transfer case to for 4wd.

easy to service and rebuild.
parts all over easy to obtain and work on in the bush/remote places
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post #11 of 13 (permalink) Old 04-21-2019, 10:58 PM Thread Starter
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I think it would be a mistake to believe an adapter and standalone computer on a 25yo trans (that was never built for cummins torque) is a realistic scope for the project. You may want to add 'GMT400' into the google bar when you're searching cummins swaps.

IMO, better to buy a whole running/driving Dodge with the powertrain you want, and do as complete a transplant as you wish. Sell off the rest. My vote is for a manual trans to avoid the computer issues entirely. Use a clutch pedal from a similar year pickup as the Suburban. Might have to go to a taller axle ratio (3.42?) to have some highway legs (or bigger tires).

I do miss my Suburban... an '84 w/6.2L. I managed to convert it to manual (4spd), 14bFF w/3.21 ratio, and JB8 brakes (both ends) before losing it in my divorce. Sometimes I toss the idea around of making my Ramcharger a 4dr. <img src="https://www.cumminsforum.com/forum/images/CumminsForum_2016/smilies/tango_face_grin.png" border="0" alt="" title="Big Grin" class="inlineimg" />

Thanks for the info
unfortunately I can not afford to buy another running driving truck to just strip parts from.
I would also like to keep it auto.
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post #12 of 13 (permalink) Old 04-22-2019, 02:45 PM
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Thanks for the info
unfortunately I can not afford to buy another running driving truck to just strip parts from.
I would also like to keep it auto.
Found this Suburban swap:
https://www.gmt400.com/threads/1996-...ns-swap.15670/

I my experience, whole donor trucks are more affordable than buying parts piecemeal. It may not be as bad in the USA though. YMMV.

93 W250 Club 6BTA |5spd |60/80/3.54/Lockright |4" lift |315/75R16 |HX35 |5x.012s |BD pin & gov spring
84 Ramcharger (project) 6BT |5spd |WH1C| D70/3.07 ...plus a few other 75-93 D/W trucks
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