2PHAST, V8 in W124?
All 400e/E420s start in 1st gear, all 500e/E500s' start in 2nd gear. (92-95)
Of course the 4matic won't let you break the tires loose.
The Best of Mercedes & AMG
With that in mind, you should only have to replace the offending rod [or all the rods with lighter weight ones] to eliminate that issue. Your R&R time is going to be the same [about 50 hours - book] but if you rebuild you current block, you will kNOW what you have [head job, new rods, new gaskets, sending units, chain, guides, etc] whereas if you get another engine you may, or may not have to address some of the same issues.
Unless I had a catastrophic issue with the motor [crack, warp], I would rebuild what I had so I would KNOW what was in there. You will end up with a completely refreshed block/heads which should give you another 200K miles.
Sounds like you need some new tires.
Back on topic, my E420 also has a CEL that is pointing to the transmission. I have been unsuccessful in finding a junk transmission, so may just swap the entire thing out for grins. Wife would probably kill me since she says no more projects (just 'finished' a Stalker)...
Any serious firewall mods to fit, say an LS1, in a W124 that already had a V8?







