High Clearance Mod for Thumper RC 4X4 Crawler

This mod only works with the [Cheater B540C transmission] included here. [B] is the gear ratio [540] is the motor mount, [C] stands for Clearance. 

If you are serious about crawling a Thumper model, this transmission and frame setup combined with the Fusion SE 1200kv is the way to go. Everyone that has switched over to the Fussion SE 1200kv is hooked. The control is far superior to other motor/ESC setups. You get a lot of performance for the dollar with the Fusion SE 1200kv. 

Note: This Mod works with 4WS. __________________________________________________________________________________________________________________

If assembling as an option and not a modification, do not print the following parts from the original Thumper listing: 043, 045, 046, 065, 068, 074 (Use the Chassis parts here instead) 

If reassembling as a mod: You will need to swap out transmission, front frame, center frame and lower links __________________________________________________________________________________________________________________

You will have to swap out the transmission, front frame, center frame, Lower links

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UPDATE: Adjustable motor belt version.  Use Optional Adjustable parts 

This new design has a tension adjustment screw. (M3 x 16mm - Placed on the top of the case) I don't have an assembly video yet but I think you can figure it out. The case is slotted. The motor mount has a slot in it to place a M3 nut in to pull the motor mount up to tension before tightening the now 4 motor mount screws. ( This allows for 2mm adjustment when only 0.5mm should be needed.) 

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Free STL files for full model here- https://www.printables.com/model/323433-thumper-18-scale-rc-car-cj7-rock-crawler-by-blackc 

Short Action Video:

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Teardown Video:

B540C Transmission Assembly Video:

Assembly Video:

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Cheater B540C Parts: (Same as Cheater B540 with the exception of one screw, Swap M3 x 20mm for M2 x 20mm)

Bearings: five - 5x11x4 / Gears:  one - GT2 20 teeth 5mm bore / *one - GT2 20 teeth 3.175mm bore 6mm wide /two - GT2 40teeth 5mm bore 6 mm wide / Belts: two GT2 116mm x 6mm wide / 5mm Rod:  one - 64mm / one - 84mm 

* You can use a 5mm bore with 5mm to 3.175 sleeve adapter. 

Screws: six - M3 x 10mm / five - M3 x 16mm / five - M3 x 20mm / two - M3 x 30mm / six- M2 x 10mm / one M2 x 20mm 

M5 washers - (You can use regular washers or thin friction reduction washers)

M5 - 10 normal or 20 thin - count may very

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Parts: (links are Amazon affiliate)

Fusion SE 1,200kv motor https://amzn.to/4cLEMQ9 

40T and 20T combo 5mm bore - https://amzn.to/3UejRxY 

40T 5mm bore - https://amzn.to/3vDLC9H 

20T 5mm bore  - https://amzn.to/43U1dOS 

5mm to 3.175 sleeve adapter  https://amzn.to/3Uc1Tfl 

Belts:

GT2  6mm x  116mm https://amzn.to/4cRHALu (need two belts)

Bearings:

5x11x4 - https://amzn.to/3VTBK68 

5mm rod - https://amzn.to/3xxcDfp 

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Thanks to Steve Eckerlein. Steve requested this mod, offered suggestions and did the prototype testing making this mod possible. 

Thanks to Muddy Trucking for additional support, picture and video