It doesn't matter.. that is the rule and it's up to you to adapt.. I guarantee that if you show up to a SOLTRA race for mod.. they will put you into super-mod unless you fix that..
The rule clearly states that you can not cut the chassis.. and the axle has to be under the chassis pan in the stock location..
You should have talked to their tech guy before you started cutting..
Quote from 2009 Soltra Rules:
11. Tractors may be lowered by way of;
(a) A fabricated front axle.
(b) Rear trans-axles, and live axles, if equipped, can have spacers and/or brackets removed, but must be re-mounted, solidly, in original location on chassis, making sure chassis sits on top of mounts.
(c) And/or wheel and tire size. Must have a minimum 15†tire on rear.