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If you peek through the outside of the uniframe, you'll see that the bolts have a locking tab on them. Once you turn the bolt a bit, the tab will rest against the framerail, and then the nut should break loose. The fun part, is getting the passenger side one loose, since the starter and bell housing bump-out are right there. Double wrench that one since a socket wrench won't work(put one wrench on it, and then 'lock' a second wrench of equal size to the first for leverage). First give them a good spraying with PB or what I like to use... Zep Super Penetrant, let them soak and respray.
When I went to swap my lift from my old '90 to my current '00, the passenger side RE Adj. CA had to go with it, since the frame mount bolt wouldn't come out. I got the nut off, but the bolt wouldn't slide out, even with prybars and such persuading it. Now, if there was a tad more room to work there, it may have turned out different, but I wasn't going to pull the tranny to do it.
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