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Old 09-06-2019, 02:06 AM   #1 (permalink)
Sparkplug Hunter
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6.2 Detroit to 5.9 Cummins swap

I have a 1984 Chevy suburban with the original 6.2L detroit and the horrible transmission to go with it which is currently blown. The truck has Dana 1 ton axles front and rear. Which may get swapped with all this work im intending on doing. I want to pull the 6.2 and tranny and than remove all the wires, (lights, batteries, spark plugs pull the seats out basically get her down to a skeleton to rewire everything and clean it up..including sand paint the engine bay..having the motor pulled out will also give me a chance to get to the break booster/ master cylinder to have all the drums swapped to disc..lots of big plans wondering if anyone knows a good place to start any good suggestions..? or how bad is it to rewire all the lights and glow plugs..? I am familiar with wire.

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Old 09-06-2019, 04:17 AM   #2 (permalink)
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There shouldnt be spark plugs. Has a hydroboost brake unit that runs off the ps pump. Not familiar with swapping in a Cummins so maybe check a cummins swap site this is the 6.2 detroit section. Good luck with your project lots of wiring diagrams and such in the faq for free download.

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Originally Posted by smackzed View Post
my guess would be shocks
Originally Posted by alpacalips View Post
Even the guys who own them aren't 5.7 guys.
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Old 09-06-2019, 08:54 AM   #3 (permalink)
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I did a Cummins swap a few years ago in a K30, there are a lot of things to think about.
Here are some links to swap sites, start reading.


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Originally Posted by Diaric View Post
What your saying happened, should never be able to happen.
Originally Posted by smackzed View Post
I put a chevrolet tailgate on my last truck and it started acting like a girl...love me, need me, want me pay attention to me. Took it off and put the GMC back on (fixed the latch) and it went back to being the same old dirty bastard it used to be
~ Bob
1987 K20 5.7 TBI 700r4 np208
1999 Chevrolet K2500 5.7L Auto
2006 Jetta TDI 5sp
2002 Golf TDi 4dr 5sp

Do yourself a favor and read the 6.2 Diesel Student Training Manual ... lots of good info...it's in PDF format located here >> PDF Manuals
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Old 09-06-2019, 07:57 PM   #4 (permalink)
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I'll save you grief, grey hair & balding, welding burns, smashed fingers, endless hrs of researching a solution to a problem & finding parts, friends, money, your marriage ... by rehoming that truck for you ...

90 Burb 1500 Silverado 4x4, 6.x in the shop, ATS Turbo on the bench . Open plenum intake. 700 R4 Now Rebuilt + 241, 10,000lb Trany Cooler With 10in pusher Fan and gauge. 8,000 LB Warn Multi Mount. TCC lock up control, 60 + 14b 4" Lift and 285 16's. ΜΟΛΩΝ ΛΑΒΕ
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it would be nice if it could deflect a deer or a prius...
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Mine ate about 6ft of paper towel once. It idled funny for a minute, then let out one big black firey fart and smoothed right out.
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Old 09-06-2019, 11:48 PM   #5 (permalink)
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It's already got front discs. Rear drums are fine. I have not found a rear disc swap that lives up to my standards. The big drums work pretty good back there. But you're sorta in the wrong spot for a 5.9 swap. Might want to check the swap sights, we usually keep the 6.2's on the road here
1986 Chevy K20 6.2TD NV4500!! 4.10's (Name: POS Truck)
6.2 Turbo Diesel (HX40 CKO), 6.5 Serp, 6.5 Lift Pump, intercooler (to come), more broken or missing parts than you can shake a fist at, balls.
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Old Today, 01:06 AM   #6 (permalink)
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i have worked on many swaps. mostly gas v8 into rangers and pintos and crazy crap like that...but many types of diesel swaps and refits in commercial applications as well...going from cat to detroit back to cat ect...

but in this case, i am one more voice.... for this is not the place for cummins swap details. hard enough to keep on top of these 6.x critters.

but if i had a 3/4 ton or larger truck and i was wanting to tow with it. cummins all the way. or duramax.

i like the lug-nut 4x4 brake upgrades though. i have installed several and am ordering a setup for myself soon.

for wiring...the setups from speedway are real nice...the 22 circuit system is my favorite. lots of options and adding a extra block is usually not needed.

i think you can do it pretty quickly and cost effectively these days with so much data available....

i cant imagine having all this info back in the 80's and 90's....
1988 FORD 4x4 Ranger. swapped in mis-match hodge podge of HMMV-CUCV 6.2 stuff / 4l80 into ford np208. All that crap is riding on ford 60's spinning 305 tires on up to 44's depending on the days menu.. so how ya like me now?

Last edited by bobbywalter; Today at 01:08 AM.
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Old Today, 09:22 AM   #7 (permalink)
Sparkys Tacoma
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I am tempted a few times a year to do a cummins swap. But my 6.5 is faster than my friends 5.9 in 95 with a few add ons. But if we are both towing he kills me
93 chevy c3500 crew drw 6.5TD(Ted's take out) nv4500(now a 4L80E)
HX35, Down pipe. 4" straight (now muffled) pipe exhaust, cross over, Aftermarket intake. Over 35,000 forward facing lumens

91 Chevy K2500 6.2L Detroit.
4X4 4.10's stock everything but
Dual exhaust. Reg cab. gone but not forgotten

2015 Ram ProMaster 2500 Diesel 3.0L 4cyl 20mpg city 30 hiway

Last edited by Sparkys Tacoma; Today at 09:23 AM.
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