So with the #4 gearbox (with motor removed), I slid it on the axle & traced the outline onto the wheelwell. Afterwards, I hacked away at it with a hacksaw (unfortunately, my dremel was out of commission).
Here it is with the gearboxes/motors mounted. (yes, I'm aware of the H-harness in the pic)
So, even though this may not be an "elegant" mod, it restored functionality to this PW after stealing the 19T #7's from it... and it still looks stock.
PowerWheels - Jeep Wrangler (74440) - Red Wrangler - unibody Jeep w/ 18V, #4 gearbox retrofit PowerWheels - Dune Squad (74570) - Yellow Jeep - metal-framed Jeep w/ 18V, LED lights, #7 gearboxes, brake pedal PowerWheels - Wrangler 98 (78490) - Army Jeep - unibody Jeep w/ 12V, OD painted, brake pedal, rubber tires PowerWheels - Grey/Pace Exclusive (86270) - metal-framed Jeep - currently stock Peg Perego - Gaucho Grande (HP252) - 70's-style Toyota Landcruiser FJ40 - 18V, LED lighting, brake pedal, front & rear traction-aids PowerWheels - X-Treme Machine (74790) - painted, 18V w/ 24V NOS, 19T #7 gearbox, brake pedal, front traction-aids PowerWheels - Hot Wheels Rally Kart (xxxxx) - 18V in process PowerWheels - Hot Wheels Rally Kart (xxxxx) - currently stock
nothing wrong with the swap at all, now you have an official "rat rod".
i may actually try some 21T #7 boxes on my safety 1st corvette, the safety 1st look stronger than PW, but its now lightly clicking after only 30 min of 24v and i have never had a PW box fail (knocking on wood).
granted a 24v controller and pedal would have avoided the gearbox strain all together.