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#1 |
Senior Member
Join Date: Aug 2004
Location: Everett, WA
Posts: 2,316
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'91 1Ton and diesel ?....
Looking at a '91 Crewcab diesel 2wd (dually) for a pretty good price locally. Am told it was a navy base truck and as such its never even been licensed. It has 65,000 original miles but is about as basic as can be. No A/C, cruise, carpet, etc. It does have a fith-wheel hitch in the bed.
I noticed that it had an overdrive dash indicator and was curious as I didn't think the 1Tons came with OD until a few years later. When I looked underneath the truck, the tranny pan looked like it was 1-1/2 feet long by about 1 foot wide? Is it possible that this is a newer style tranny like a 480LE or something like that? Also, in another thread I saw that in the governmet (military) diesels they spec'ed them with higher fuel flow or something like that so they performed a lot better? Would something like this qualify? As a 1Ton dually wouldn't this truck be geared pretty high (or low, or whatever?), like in the 3.93-4.11 range? BTW, this is the "old" body style like 81-87. Any comments are appreciated.
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2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold) |
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#2 |
Gentleman Jim Driver
Join Date: Nov 2002
Location: Poulsbo, WA
Posts: 1,550
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In 91, they did put the 4L80E in some one ton duallys. That would be an awesome setup to get a hold of. It has a separate transmission controller because that 6.2 is not controlled by an ECM.
That would be a J code (heavy duty) 6.2 not only because it is military, but because it is in a 1 ton. Note that the J codes 6.2s still aren't power houses. If you'd don't end up buying this truck, I'd love to get in line and I'm local too.
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Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed |
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#3 |
Ultimate Diesel Dude
Join Date: Oct 2002
Location: Southwest Missouri
Posts: 328
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Interesting....I've never heard of an overdrive behind a diesel in the old body style 1 ton trucks....I don't think the 4L80E came out until 92.....
If you take another look at it, try and find out some more info on it...you might look at the glove box and see if it lists tranny options. Casey
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Project truck: '81 C/20 converted to 6.2L TURBO DIESEL bored .040", gear drive, 6.5L injectors/pump, custom pistons, custom 4" exhaust, 700R4, 4.10's Daily Driver: '95 K1500 Tahoe, 6.5L TURBO DIESEL, NP241, 4L80E, 3.42's |
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#4 |
Gentleman Jim Driver
Join Date: Nov 2002
Location: Poulsbo, WA
Posts: 1,550
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I can't remember my source, so I can't point to it. They put the 4L80E trannies in starting in 91 (454 SS is one place you can find them...) and they put the 4L60E's in starting in 93. Just like GM normally does, they made a changes to the last year of the production model before they got rid of them...
kevinr1970 - Is that truck at Detroit Auto Works? They told me they wanted 8995. That seems like a lot for a 2wd even with only 68k miles.
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Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed |
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#5 |
Senior Member
Join Date: Aug 2004
Location: Everett, WA
Posts: 2,316
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In the glove box all the codes are just that, codes. They don't spell out what the code stands for after them.
Yes it is the one at DAW. I was talking to the salesman and he was pretty flimsy on the price. Seems like I talked him down a few grand before I even started it up. If you aren't familiar with the dealer (I use the term loosely...), they came into existance in the muscle car craze late 80's-early 90's - DAW, Muscle Car Heaven (more like hell). I think every one who worked there (including the owner) went to jail at one time or another if not for ripping people off, then for something to do with a white powdery substance. Don't ask how I know this.....
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2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold) |
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#6 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Good find!I own a`91 2500 4wd Suburban 6.2/4L80E.Other goodies:4.11s & No-Spin Rear.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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