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Customise your crawler or build a fully custom TRX4M based RC using these axle housings. Not only will they replace your stock housings, they'll replace most 3rd party axle housings and allow you to run rigs with 6x6, 8x8 or even more axles. Not only that, you can run steering on as many axles as you like. Want an 8x8 with steering on the front 4 wheels, not a problem. Need 12 axles and steering on all, these have got you covered.
FEATURES
Designed to accept the same axles, bearings and diffs as standard and most 3rd party TRX4M products
Second print profile included specifically for Injora +4mm axles (the same as used in their diamond and extended width axles)
Diff housing allows ring gear to be installed on either side (for correct wheel rotation on multi-axle builds)
Two different steering link arrangements - standard design and a higher clearance design to allow steering on pass-through axles
Lay down servo mount for lower COG (this may cause clearance issues on some chassis, especially the stock chassis)
Note: the high clearance steering linkage may cause rubbing on the inside wall of the tire, so I recommend using rims with a large offset and/or longer wheel hexes to space the tire further from the axle
PRINTING PROFILES
Parts have been oriented to provide max strength where required
100% infill - don't cheap out and reduce it, the parts will benefit greatly from the added strength when flexing or impacted
Two differnet steering linkage setups, select the steering linkage your prefer. For steering on pass-through axles: use only the high-clearance steering linkage, this will allow your drive shafts to clear the steering links
ASSEMBLY
Place the bearing on to the pinion then slide the shim on to the pinion gear behind the bearing and install in to the axle housing - I recommend using the one 0.5mm shim as a starting point, it has worked well for me so far. If the mesh on the diff is off when you run it and you need more or less of a shim, scale up or down the Z axis only on the shim and re-print. Repeat with the second pinion if using a through axle.
Insert the ring gear with bearings - this can be a bit of a pain to get right, as the tolerances and fit are pretty tight, but just have patience and try rotating and jiggling the pinion to help - a little controlled force may be necessary - make sure you get the correct orientation for each exle, or you'll have one axle running forwards and the other in reverse
Grease the gears and bolt the top and bottom diff covers on using M2x16mm bolts - check that the pinion rotates freely by hand
For non-steering axles:
Insert drive shafts and bearing, then secure with two M2x4mm bolts on each side
Use two M2.5x16mm to attach lower links and shocks and one M2.5x20mm to attach upper links
For steering axles:
Attach the servo mount using two M2x5mm screws - it's important you do this before attaching the C-hubs - see below image for correct orientation, though you can rotate it and/or mount the servo in front of or behind the mount for a few different locations to suit your needs if using the standard linkage
Attach each C-hub using two M2x8mm screws on each side - check correct side/orientation, there is a notch on one side to allow more clearance for the shocks
Insert the bearings in to the steering knuckle, insert bearing in to C-hub, then attach each steering knuckle using two M2x5 screws - they should stay put, but if you have issues with them working loose over time, use a little loctite or superglue on the end of the screw
Use two M2.5x18mm to attach lower links and shocks and one M2.5x25mm to attach upper links/servo mount
For standard steering linkage:
Use two M2.5x10mm to attach link to steering knuckles
Assemble the steering arm using a 10 - 12mm length of M2.5 rod (or just cut the head of a spare M2.5 bolt) to screw the two halves together - this can be a bit fiddly, so take you time and try to get it aligned relatively straight. Leave approx 1-2mm gap between - you can adjust this later to ensure you get the axle running straight without needing a ton of trim on your transmitter
Attach the steering arm using an M2.5x10mm
For high clearance steering linkage:
Assemble the steering arm as above using M2.5mm rod
See image below on how to connect the steering arm, linkage and spacers - use two M2.5x14mm
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