Reminder in regard to chassis
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The rules say:
3.1.6 No modifications may be made to any manufactured part except where specified in the individual class specifications.
3.1.15 Reinforcement may be added to the stamped/formed steel chassis in the rear uprights, front tongue, and side pans.
3.1.16 No grinding on chassis or removal of weight is allowed.
3.1.17 Front axle uprights may be bent down to horizontal position.
3.1.18 Tape may be added to the top or bottom of the chassis.
3.1.19 Pin tubes may be added to the chassis to facilitate body mounting.
3.1.30 May modify rear bushing holes to adjust ride height.
-- No other modifications to chassis.
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So, if you have modified a chassis and/or pans in any other way than listed above, it will not be legal.
For example, if you have soldered things on a chassis/pans, or used a blob of solder to control pan movement, you need to take the chassis back to stock.
Note: Regarding adding weight to a chassis or pans; even though it didn't get written into the rules, weight may be added (but not in a position where it limits stock pan movement).