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GVW difference

Dually have a higher GVWR. The "weakest link" on a SRW truck is the tire ratings. Dually "weakest link" tends to be axle rating, which is higher. Depending on which generation it's about 1,000 lbs-ish. Tow ratings are for the most part the same providing the only difference is DRW vs SRW because towing is more based on engine, tranny, axle ratio.
 
Nice looking rig. I have the 97 & 98 sales brochures for the GMT 400s. If I remember correctly the DRW can carry more weight and I believe the GVWs are different as well. They are rated to tow slightly less. I believe the max tongue weight of the trailer on the dually was higher. As the vehicle itself got heavier GM lowered the trailer weight to keep the GCWRs in line. Pretty sure the GCWRs were tied to the gearing and the drive train. Of course this is from memory so I could be off... been awhile since I looked at them brochures.
 
Les my 96 CCLB SRW GVW sticker on door says 9000/4082. Then there is a front and rear rating on the sticker also, but I fogot what they are.
 
OK, pulled out the info booklet for the 2005 model year Silverado

For simplicity sake I'll only compare 3500, 4x4, crew cab, 8.1 engine, 4.10 axle, 8 foot bed: SRW vs DRW. All those variables end up changing the numbers slightly here and there.

SRW:
- GVWR 9,900
- Payload 3,806
- Ball hitch max trailer weight 12,000; GCWR 22,000
- Fifth wheel max trailer weight 15,000; GCWR 22,000

DRW:
- GVWR 11,400
- Payload 4,854
- Ball hitch max trailer weight 12,000; GCWR 22,000
- Fifth wheel max trailer weight 14,800; GCWR 22,000
 
interesting it increased the GVWR 1500 but the payload only increased 1048. So are they subtracting the weight increase of the dually running gear?
 
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