^^^Yes, you can go to 4.88. Just remember per the PIC above, the Dana 30 has a much smaller Ring&Pinion so that is your weak Link. So just go easy on the peddle!!!
With 37's, Heavy Duty grease-able Ball joints, C Gussets and a Truss are recommended!
You may want to read through Kjeeper10's build Thread. This will give you a idea how to beef up our components such as steering linkage and Track Bars. But he does have the Dana 44 front..FYI
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