i have a 93 runner with a g58 and someone on this board told me they talked to marlin and yes they will bolt up to a g58 tranny, however marlin said they are not as strong as if you were running a w56. so yes your tranny will work with 2 gear driven cases and the chain to gear adapter. Also he said the strength is really not that big of a deal. Im interested to know more too so any info from other people would be cool.