[terry.sc]

Differences between the original CAT, CAT XL and XLS.

Original CAT
Short wheelbase
Rear differential built into layshaft, like the RC10 6 gear gearbox
Integrator unit where the rear diff should be, to adjust drive to front
Solid front pulley with one ways built into driveshafts
Stick pack battery mounting
Bent grey kydex front bumper

Changes between CAT and XL
Long wheelbase
New moulded bumper

Changes between XL and XLS
Front ball diff
Wider front and rear suspension using spacers and new rear fibreglass upper brace
New front shock mounts giving greater castor angle and kick up for front suspension

Changes between XLS and Procat.
New front bumper with holes for adjusting tensioner
New front gearbox moulding with built in belt tensioner
New front diff pulley that holds 14 balls instead of 9 balls
New wider saddle pack chassis
New fixed layshaft with new spur gear held on with o-ring. XLS layshaft contained rear ball diff
New rear diff with solid pulley to replace front drive integrator
New moulded plastic rear shock tower and wing mount
New rear suspension taken from the Topcat/Cougar

All the parts were interchangeable between models, for example it was quite common to update earlier cars with the Procat rear suspension if you had already upgraded the transmission with MMS parts instead of buying a whole new kit, and Schumacher updated some parts so the mouldings in the kits changed over time while keeping the same part number.


While the Bosscat looks similar it was a complete redesign sharing very few parts with its predecessors, only small detail parts were shared with earlier cars, with new chassis and transmission moving the belt above the chassis, new front and rear suspension, shocks and bigger 2.2" wheels.
While quite different some of the parts were interchangeable with earlier models, so again you could upgrade suspension parts on earlier cars with Bosscat ones.