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Old 02-21-2006, 01:50 AM   #1 (permalink)
teamjnz
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99' K2500 6.5TD Suburban.. wimpy tow rating

I was looking in my owners manual for tow rating, only 6000#. WHAT!! That is the same for my 5.7 gasser. The 7.4L gasser is rated @ 10000 with the same gears. I am really suprised at this. There are a lot of people in this forum towing up to 12k and more with the 6.5TD.

I have plans to upgrade the exhaust and get gauges soon. Then I want to get a Turbo boost controller and new PCM. I have a travel trailer dry weight @ 7000# and with water and gear could be up to 8000-8500#'s. I really hope these upgrades will tow this weight just fine.

What do you think??
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1999 Chevrolet Suburban K2500 6.5TD "F" 3.73 Gears
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Old 02-21-2006, 05:02 AM   #2 (permalink)
Jake
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Changing to the 4.10 gears will get your tow rating up to 7,500. The truck will also feel a bit peppier with only a small effect on your mileage. With a 4x4 this conversion can get a bit pricey unless you can find the pieces in a junk yard.

The added power will help, but make the gauges a priority. Towing without them is a good way to overtemp your engine. I've towed a 7000# trailer without much trouble, even in the hills of West VA.

Jake
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3.73 gears, Heath Remote PMD, Heath Heavy Duty Lift Pump, Banks 3" downpipe, BD 4" exhaust, JK headlight booster kit,
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Gauges: fuel pressure, manifold pressure, and EGT in a 3 gauge pod, plus engine oil and trans. oil temp on top of the dash. Bilstein shocks and Hotchkis sway bars on the greasy side. High idle mod too. Grover 1510 (Firetruck) air horn. Four wheel disc brakes.

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Old 02-21-2006, 08:35 AM   #3 (permalink)
manyholes
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ive got 3:73's in my 3/4 ex cab s/b 4x4, I can town in excess of 10,000lbs and not work the truck too hard and that was thru the mountains and with stock air/exhaust
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Replaced PMD, lift pump, fuel shutoff solenoid, brakes, shocks, fuel filter, idlers and pitman, balljoints, cv shafts, delphi injectors and bosch duraglows, control arm bushings

Last edited by Turbine Doc; 02-21-2006 at 09:17 AM.
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Old 02-21-2006, 08:38 AM   #4 (permalink)
Turbine Doc
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How much $$$ you want to put in it, I'm capable of pulling 18K, but don't pull there very often, mine is stickered for 6K, so would probably have to fight a ticket in court bringing all my evidence with me why I'm okay with it.
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Old 02-21-2006, 08:55 AM   #5 (permalink)
SteveKoz
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Quote:
Originally Posted by teamjnz View Post
I was looking in my owners manual for tow rating, only 6000#. WHAT!!
You sure your looking in the right place? My book says 8,000lbs.. and I still think that's too low for a 6.5TD.
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Old 02-21-2006, 09:16 AM   #6 (permalink)
Turbine Doc
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Depends on what package the vehicle came with, go to RPO code in FAQ and you will see the different rating limits, generally S engines carry the lighter ratings, final gear ratio, suspension (springs/frame/wheels/tires), vehicle base weight, & braking rating are players in how they are rated from GM no method to the madness IMO, gassers witrh lesser equipment sometimes carry higher tow capacity.
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98 (S)K1500,IC,3.73 gear,4L80,Heath 4"exh,Amsoil air & bypass oil flts,Heath fan clutch,Stans Xover,pilar mtd BST/EGT/TRN,remote 12v fan tran cool,PML trans pan, PML diff cover, Hi pops, Heath PCM,Heath remote FSD, HDP Balance Flow, Heath lift pump, SSBC front calipers, EGR rear disc conversion, Goodrich brake lines, No-Slip locker, Roadmaster suspension, Lube specialist oil lines, Putnam lock & load hitch, ******* turbo.

98 C1500 Burb Heath reflash,exhaust, TM
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Old 02-22-2006, 12:41 AM   #7 (permalink)
THEFERMANATOR
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I know that I have towed 8,500 with mine. No problems at all, power to spare. And this was with MASSIVE frontal area(box trailer with almost 9' inside height).
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Old 02-22-2006, 12:54 AM   #8 (permalink)
r85sub
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Yeah. It blows me away my truck is rated at 8000 with a 14 bolt rear and a Titan is rated at 9400. Don't make sense to me.
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1999 GMC K2500 Crew Cab 6.5L,"F" engine code,4L80E trans.,4.10 gears,K&N, 3" downpipe, 4" exhaust, 2.25" mandrel crossover pipe.VDO boost,pyro,trans. temp gauges.Kennedy boost contol.Remote mount PMD.Heath GLE reflash,HDP Balance Flow.Heath HO injectors,Custom intercooler.Bulletproof bedliner.Leer shell.43 gal. TransferFlow tank/toolbox combo.
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-1999 25 foot Wildwood toyhauler-9000lbs. with toys in it.
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-2000 Honda Foreman, Detroit Gearless locker.Hi-Lifter lift kit.26" Gators.Snorkel to 48".Aluminum skid plates.Hi-Lifter front and rear disc brakes.
-1988 Suzuki LT230(daughter's quad)
-2001 Kasea Skyhawk 50(son's quad)
-70cc big bore kit, Trinity exhaust, 20mm carb.,Uni filter, lightened clutch, douglas wheels, RAZR tires.

Last edited by r85sub; 02-22-2006 at 01:34 AM.
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Old 02-22-2006, 01:02 AM   #9 (permalink)
D.Camilleri
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Gross vehicle weight is different than gross combined vehicle weight. Something is amiss. Titan's only have a wimpy dana 44 in the rear end. I have towed 23,000 combined gross vehicle weight from Ca to WY over the worst passes in the rockies with a slightly modded 6.5 and it did very well.
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Old 02-22-2006, 01:30 AM   #10 (permalink)
r85sub
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Yeah. I know something is amiss. I went to buy a towhauler and when the guy looked up my towing capacity it said 8000 lbs. I know my GVW is 8600. So when I got home I went online and sure enough Trailer Life Magazine said 8000lbs.
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1999 GMC K2500 Crew Cab 6.5L,"F" engine code,4L80E trans.,4.10 gears,K&N, 3" downpipe, 4" exhaust, 2.25" mandrel crossover pipe.VDO boost,pyro,trans. temp gauges.Kennedy boost contol.Remote mount PMD.Heath GLE reflash,HDP Balance Flow.Heath HO injectors,Custom intercooler.Bulletproof bedliner.Leer shell.43 gal. TransferFlow tank/toolbox combo.
-ATA hanging intercooler club #8
-1999 25 foot Wildwood toyhauler-9000lbs. with toys in it.
-2004 Honda Rubicon(Wife's Quad)
-2000 Honda Foreman, Detroit Gearless locker.Hi-Lifter lift kit.26" Gators.Snorkel to 48".Aluminum skid plates.Hi-Lifter front and rear disc brakes.
-1988 Suzuki LT230(daughter's quad)
-2001 Kasea Skyhawk 50(son's quad)
-70cc big bore kit, Trinity exhaust, 20mm carb.,Uni filter, lightened clutch, douglas wheels, RAZR tires.
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