Greetings!
I'm planning to do a DRW->SRW on a 2018 3500 cab chassis (84CA only available as DRW) for a flatbed camper conversion.
Any wisdom you can share from your experience? I want to match existing tread width distance, but can't find info on wheel mounting surface spacing fr/rr to spec wheel offset.
Thanks,
Matt B
The DRW axle is a bit wider than the SRW axle for sure. When you say "match the existing tread width distance" I believe you mean that you want the new single rear wheel track to match the front, right? However, if you measure the track width of the front and rear wheels on any 2500 or 3500 SRW truck I believe you will find that they do NOT exactly match. For the actual specs, I would suggest you inquire at an alignment shop. They will probably be able to look up the exact front to rear offset of a SRW truck for you. If you want the front and rear tracks to match there are a few ways you could come close.
1) One would be to swap the DRW axle with the rear axle from a SRW truck. You would then exactly match the factory setup of a SRW truck, and you get to use the same wheels front, back and spare.
2) You could have custom wheels made such that the backspacing for the front wheels have a different offset than the rear wheels. This also has the potential of exactly matching the factory SRW layout. Of course, then what would you do for the spare? Maybe two spares, one of each?
3) You could use look for wheel spacers to step out the front track match to the rear track. That would not be an exact match to the factory layout, but you could come close to having the same track (provided you can find suitable spacers). That would also allow you to use identical wheels on each axle; but personally, I am not a fan of wheel spacers, plus moving the front wheels out would undoubtedly adversely affect the truck's handling.
Of these, I think the first option would be the best, that's what I plan on doing if I ever win the lottery. And I would install an air locker into the rear axle at the same time. However, I have not noticed any problems on my truck with the mismatched wheel tracks, so I haven't started playing the lottery yet.