Cougar – wow! that brings back some childhood memories. That was my dream lego set as a 10 year old and I finally got it one Christmas. I also had the woefully underpowered electric motor kit to make it drive. It used to shit the gearbox regularly if I recall.
From memory, it always used to bug me that the gearbox ratios were the wrong way round. Ie, you shifted down from first to second and the engine sped up in relation to the wheels rather than going slower. I used to switch the cogs round when I built it as a kid, so that it worked correctly and appeased my CDO.
Thinking about it just now, I’m wondering if the gears were actually forward and reverse rather than first and second, and I’ve been wrong all these years. I never had the motor kit, so never noticed whether the engine changed direction or not.
I’m not going to sleep now till I’ve rebuilt the thing to find out.