My old 300 TE 4-M used to break sway bar brackets more regular than usual. I chalked it up to me driving it very aggressively but now that I think about it my new 300 TE 4-M hasn't broken one yet. That shoots a hole in the aggressive driving theory. I know for a fact that the old one had a spring perch that was separating from the body. It's a long shot but not a bad idea to look closely at where the front spring perches mount to the body. If they are at all suspect you should remove the undercoating and inspect closer.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff