difference in Dana 60s

[mollyman]

I sometimes see dana 60s called srw and sometime drw. What does this mean and wich kind would I need to fit in an 81 sub? Thanks for any help

 

[mollyman]

Also, will any ford dana 60s fit into a chevy? Thanks again

 

[mudman83]

Fords have a driver side pumpkin, so if you have a newer IFS chevy transfer case with driver's side drop, you can use a ford dana 60. SRW means single rear wheel. DRW is dual rear wheelsa and is wider for duallys, but can be converted to srw by changing the hubs.