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1991 GMC Suburban: Doomsday Diesel Part 6

37-Inch Tires, Brutally Simple Suspension, and a Dozen Other Parts Built To Last Forever

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When building a diesel truck you want to last, less is always more. Less plastic means more steel, fewer electronics means more reliability, reduced options means more capacity, and zero spark plugs means more power and fuel economy.

When we began our 5.9L Cummins-powered Doomsday Diesel project back in the January ’12 issue, we knew we wanted a low-tech truck that would be too simple to fail, yet easy to fix if it ever stopped running. We didn’t anticipate we’d be replacing or rebuilding everything that spins or holds fluid on this ’91 GMC Suburban —but that’s what we’ve done. As you can imagine, it’s taken us longer than we expected.

Why have we gone this far? Well, building a vehicle that will function through the apocalypse required an assembly of parts that we could be certain wouldn’t fail. The best way to gain that certainty was to inspect each critical component. The systems deemed worn out were rebuilt, those pieces seen as weak were upgraded, and the creature comforts discovered to be unnecessary were removed.

When Doomsday Diesel is complete, we expect to have an all-terrain vehicle with a 1,000-mile fuel range, seating for four, and virtual (if not actual) bulletproof durability. The true test of this machine will be an escape from Los Angeles scenario, in which we see what it really takes to escape this booby-trapped metropolis after society crumbles. Or we’ll just try to drive out of town on the Friday afternoon before Labor Day weekend.

SOURCES
Rockland Standard Gear
150 Route 17
Sloatsburg
NY
877-774-4327
http://www.rsgear.com
Dynatrac
7392 Count Circle
Huntington Beach
CA  92647
714-596-4461
http://www.dynatrac.com
Off Road Design
970-945-7777
offroaddesign.com/
Hutchinson
250 Ewing Street
Trenton
NJ  08609
609-394-1010
http://www.rockmonsterwheels.com
Rancho Suspension
1 International Drive
Monroe
MI  48161
734-384-7804
http://www.gorancho.com
Lee Power Steering
818-768-0371
http://www.lee-powersteering.com
LMC Truck
15450 W. 108th Street
Lenexa
KS  66219
800-562-8782
http://www.lmctruck.com
Borgeson Universal
91 Technology Park Drive
Torrington
CT  06790
860-482-8283
https://www.borgeson.com
Energy Suspension
1131 Via Callejon
San Clemente  92673
888-913-6374
http://www.energysuspension.com
Mercenary Off Road
Sun Valley
CA  91352
www.mercenaryoffroad.com
Industrial Injection
1201 South 700 West
Salt Lake City
UT  84104
800-955-0476
www.industrialinjection.com
Prime Plating
www.prime-plating.com
BFGoodrich
877-788-8899
http://www.bfgoodrichtires.com/
Reid Racing
1917 Oak Park Blvd.
Pleasant Hill
CA  94523
925-935-3025
http://www.reidracing.biz/
TCI Auto
888-776-9824
www.TCIAuto.com
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