Poor mansw124 sportline conversion

atypicalguy

07-26-2018, 02:36 PM #27

(06-17-2013, 01:40 PM)SurfRodder A couple of things...

The V8 rear subframe (should be same between 400/420 & 500) is a bit heavier duty & requires the updated 12mm bolt links, which have superceded the 10mm (IIRC) ones.... but prolly not worth the swap, especially since you have to upgrade the diff to 210mm, which to maintain factory 300D (OM603) ratio means you have to find a 93-95 E320/E280 (may be others) to get a 2.65:1 210mm one, the cover is significantly different between the smaller 185mm one that comes stock behind the 603. Ive got pics somewhere that Ill put in my yet to be constructed build thread for my w124 that show the physical differences between the two subframes and diffs...the larger diff is physically about 1.5" or so wider, but the axles enter the case within a 1/2" of the smaller one, so the axles swap without issue...
the rear brakes are slightly larger diameter, but much thicker & vented, which is the important facet of the upgrade...calipers are more difficult to come by tho...

Regarding interior swaps, the V8 models have different seat bottom brackets (trans tunnel is larger apparently) which make the rear carpet(under the front seats and back) different as well. You can cut new holes to make it work with the non-V8 seats, but the old holes will still be there...also the wiring between the old and new seats requires the old seat brakets&motors(at least witout mods)... the rear "C" pillar panels are different as well and would necessitate welding in different seat belt brackets to utilize, best bet would be to find the older style in the proper color.

Rear sway bar requires removal of subframe (al least partially) to be swapped. I installed an S600 one, even though it was similar dimensions to the stock one...not sure if its better or not yet as my suspension isn't finished enough for me to really flog yet.

I had been planning to transplant a v8 driveline into my 87 td for awhile, anticipating more power from the myna on the 606. But even with 6mm elements it ate a halfshaft and twisted the stock diff out of the subframe, which moved up my timeline a bit.

Will the eight bolt guibos fit on the earlier, 6 bolt cars? The other 210mm 2.65 diff is from 91-93 500SL, but it has the four bolt flange for the V8 driveline. My plan is to put a four bolt flange on the 722.3 and transplant the entire subframe, driveshaft and center support from an e420, but I don't know if the larger guibo will clear the transmission mount on the front of the driveshaft.

The V8 half shafts have larger inner CV joints, more splines, etc. Outer joints are identical to the m104 stuff.

500e rear swaybars are NLA. The w210 e55 bar will fit, but needs the spacer plate for the SLS sensor or it will hit the bar. w211 stuff will also fit, basically, on the rear sway. And it is 21mm, up from 18 on the 500e and e55.

I will have to look into the rear link bolt sizes. Didn't know that. I bought all the urethane bushings from Poland/strongflex or strongthane or whatever so will stick those in wherever possible when I switch to the V8 subframe.

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