Has anyone done the tie rod end replacement and know what threads (L or R) I should be ordering for left & right tie rod ends on my 1992 400E?
Parts from Fastlane listed as:

1. Right;;Left Hand Thread;w/ left hand Threads for right Tie Rod
2. Right;;Right Hand Thread
3. Left;;Left Hand Thread;w/ left hand Threads for left Tie Rod
4. Left;;Right Hand Thread;w/ Right Hand Threads for Left Tie Rod

Thanks,
L

You'd probably be ahead of yourself to just replace them as entire assemblies, unless there something about the 400e that is atypical from any other w124...

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1989 300E 144K

Thanks for the tip.
The tie rod ends are cheaper (approx. $35 each) and the rest of the assembly (approx $70 each) is still in good condition, so I was thinking of just doing the ends.

Napa has it listed as:
1992 Mercedes-Benz 400E
Comments: w/ Right Hand Threads
Per Car Qty: 2
So both left and right would have right hand threads, Is this correct?

Yeah, each tie rod has two ends with opposite threads, so they can be adjusted without removing anything.

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'85 500SEL, 245,000 miles (sold)
'92 400E, 295,000 miles (donated)
'84 VW GTI (work in progress)
'10 VW GTI (daily)
'72 Chevy C10

Look at the assembly and you'll see an inner and outer end on each side - the shorter part is the inner one. Given that they are both wearable ball joints, it probably makes sense to replace them both (or the assembly).

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Prost!