w108,107 Parts Hoarder
Date registered: Jun 2010
Vehicle: slc5.0cab 280sl5sp 280se4.5 500sl92 GONE:280sl79 4xW114/5 3x450sl72-3 280slc4sp81 280s69 73,81SLCs
Location: Philadelphia Area
Mentioned: 27 Post(s)
Quoted: 1570 Post(s)
The front subframe from a 1986-89 560sl is an updated version of the subframe used on w114/115 cars (and all 1971-1985 r/c107). The earlier versions can be reinforced with "gussets" (sheets of metal bent at the bottom) from MB that were NLA last I checked. I was able to get a set of gussets for about $110 from another forum member. I've also collected a few 560sl subframes that I considered myself lucky to get for about $250 as I've seen them go for $500-900. Of course I have yet to use any of this stuff on my two r/c107 cars that both need at least reinforcement on the subframes of not replacement.
I know that's TMI, but it seems relevant to the post above. I'm not sure if he's saying the frame is prone to cracking, or the subframe. I suspect it's the subframe. The subframe has an open service campaign (not technically a recall) on the iron block v8 cars sold and residing in the US. The extra weight of the r/c107 iron v8 is apparently too much for the w114/115 design. Alloy block 380sl cars have been known to fail, and many w114/115 cars have had the failure. In the r/c107 world welding a crack isn't acceptable, but apparently in the less valuable w114/115 world it's been done more than a couple times.
Make sure you don't use a cracked or bent subframe.
Sorry for the long post.
My dream car is a classic sporty five speed (stick+overdrive) convertible that seats five. If, you want 70's-80's Mercedes tuner wheels, let me know.