Originally Posted by
Travis S
Eagerly awaiting to hear if the TB04 gear diff will fit in the TB03! Someone has to have both cars and be able to test this out for me!
Both the TB04 and TB03 use the same "A" parts tree, 51351, which includes the gearboxes. This means TB04 gear diffs and TB03 ball diffs should be interchangeable. I haven't built my TB04 gear diff yet and tried it in a TB03, but in theory since the parts trees are the same it should fit with zero problems. I do think you'll want to match the pinion and ring gears, not mix a TB03 pinion with a TB04 ring, since they come as a set in 51547.