If you took two diesel towrigs head to head on stump pulling power, just pulling power not load capacity. would the Dooly & the SRW pull the same? The only difference being the rear-end... I have a 2500HD Crewcab longbed SRW diesel. Does a 3500HD Crewcab longbed DRW diesel have any more pulling power? I would think they would pull the same as in my mind the only difference is the rear wheel suspension for heavier loads....yes no? Just something I have been thinking about :doah:
I have had both in the Ford models. The dually wins with my two because the rear ratio on the single was 3.73 and the duals are 4.10. More low end torque. Therefore, the dually is a better 5th wheel puller (long term heavier duty) but the 3.73 singles are a better road truck. Lower rpm all the way through the gear range. At road speed I continue to look for an extra gear with the 4.10's. Good thing is I go slower...I had 126,500 miles on my 03 (3.73) single before trading in to my 07 (4.10) dual. The readend was the weakest link and was soon to give as all my miles were pulling my 5er...
Burt, No.... two identical trucks that have the SAME poke: ) rear end ratio and identical drivetrains will pull the same. The two extra tires help laterally more than anything really, that and catch curbs in the drivethrough....
I have had both. I pull a 12K lb. fifth wheel. The added stability of the DRW makes pulling the camper much more enjoyable. The 2500 SRW pulled great and so does the 3500DRW, the difference in the stability will keep me in a 3500DRW. A have a friend here who converted his Dodge 2500 to a DRW and he loves it. He says the next truck he buys will also be a DRW 3500.
I Tow Travel Trailers from time to time for $ but I also own a 28R Hornet 8k lbs empty and the SRW does me just fine. Now if I had a 5'th Wheel then I would Get a DRW. F/P
On thing I was thinking about is the % of torque loss from the engine to the rear wheels. Ya know how if you Dyno just the engine you get real high numbers, then if you dyno the the whole truck the actual rear wheel numbers are much lower that thoes at the crank. SO ~ a DRW axel has alot more weight and added tires I'm curious if this would actually add more rear wheel "loss" in rear wheel torque than a SRW does?? :doah: Eatiher way I'm sure it's not off by much...I understand the stability factor just thinking about rear wheel torque. Would be kinda neat to see both on the dyno back to back and then compare the results...wonder who would have more rear wheel torqueopcorn:
Thats why the dually has a lower gear ratio to compensate for the added weight.. The power it still there, but the reaction time and power is affected by a parisitic drag (Drive train), the motor alone has no "drain" of the power compared to being conected to a full drive train, you go from a Potential energy to a Kenetic Energy..
basically thats why a dually will have a lower gearing,numricaly higher,and a sing rear wheel will have a higher,numricaly lower,rear gear now with the same ratio the sing rear wheel would come out on top on the dnyo due to less parasitic loss.
1 ton duallys don't generally have a different ratio than 3/4t or 1 ton srw versions. When they do, it's because generally DRW trucks are going to see more loaded miles, needing an extra low gear set. Not because of the added parasetic drag of two extra tires. Stepping down a ratio counter acts 10 fold of what small amount duals eat up in actual driving. The slightly higher rotational mass from duals is seen with the drag racers, duallys usually don't quite run the times an SRW truck can with the exact same mods, but we are talking tenths of a second at best. In the real world, there is NO difference in pulling power between the two. Loaded down, on dry pavement two tires provide plenty of traction. Like I said earlier, duals are more so for lateral stability. In windy, icy conditions they really help keep things stable, and they don't do a whole lot as far as adding traction. Duals do add some forward traction in slippery conditions, but don't perform miracles like some think in the mud, ice, and snow.
Ya I realize that I had worded that section a little odd, Im well aware that DRW have a lower gear range because they will see more of a load than a SRW, not because of the extra wheels.. I was doing 5 different things when I was typing that little paragraph, and trying to figure out how to word everything
No worries waytogo For me the SRW fills all my needs and works great. Just nice to know the DRW is basically the same truck with added payload and stability. I haul a truck camper so I will never need to tow a 5ver or the like so only hitch towing for me waytogo Thanks for the replys fellas! Burt
Yeah, most people that have DRW trucks, don't need them. You really only need them if you tow ALL the time, tow really heavy, or get in bad weather on occasion. I'm glad we had a dually last Janruary in Nevada, the road was iced up and a gust of wind blew our truck and trailer laterally around 1-2 feet. Thats when those duals count.
