Gerry C.

I have a '19 25000 Duramax and after extensive research on this subject during the past two weeks, I found that there are only 3 differences between a 2500 and 3500SRW. 1) 3500 has 18" tires rated at 3590 lbs. The 2500 has 17" tires rated at 3195 lbs. 2) 3500 has 18" wheels and 3) the 3500 has helper springs. In a "diesel" configuration, the 2500 & 3500 srw share the same exact motor, transmission, differential, chassis frame and main spring pack. In a gas configuration the 2500 has a differential without the additional gussets welded to the pumpkin. The gas 3500 has the same diff as the diesel 2500 & 3500 trucks with the welded gussets. Anyone know if a 2500 with all those upgrades can be recertified by the NHTSA? Thanks.