Rex 1:8 scale - Rollback Rear Section - 1:8 scale 6x6 (131pcs.)

Rex - Rollback Rear Section - 1:8 scale 6x6 

Read Carefully! - Rex is a modular truck system - This post is for the rollback section. More option to come - All the STL files you need to build the rollback truck is here free on printable.com. The front section is here- https://www.printables.com/model/1306287-rex-352-peterbilt-day-cab-and-front-frame-95pcs 

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Are you new to Black Crow Prints? All the STL files are here free on Printables.com. A non printed parts list is below along with easy step by step assembly videos. Help is available, usually within 24hrs. You can contact me thru private message or comments on the makes and comments tab. File updates are always listed at the bottom of each description page. Ways you can help: Let me know when I make a mistake. Share your builds with friends on social media and subscribe to my YouTube channel. If you would like to help me provide these models free to others you can become a “My Club” member. No obligation implied. You will get no special treatment from me other than my appreciation. .. Now go build an adventure. 

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   This is a large 1:8 scale model measuring 30 inches (76cm) long, 16inches (40cm) tall, 12 inches (30cm) wide. This model is going to be more expensive than my other models due to the additional parts and size. The frame is reinforced by 10mm square carbon fiber rods. Some parts are also reinforced by 5mm metal rods. The modular design will allow for easy future updates and options.  

This model is all wheel drive, The rollback is strong and functional using just one TX channel. The bed has a winch using an additional TX channel. All together you will need a four channel radio for full function. ( steering, throttle, rollback, winch) The rollback function can be used remarkably well manually if you leave the lift screw and lift screw motor off. (They can be added latter)

This is an easy yet more complex build than my previous models. The frame and drivetrain is actually fairly easy and simple. The most difficult part of the rollback is usually routing the wires and programing the RC transmitter. 

My inspiration came from watching Russian logging trucks. Many of the trucks did not have trailers. The frame rails were longer than normal. the standard tires were replaced with tractor tires. I though to myself, that would make a great off road rollback. 

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Rex Rollback Rear Axle:

Rex Mid Axle:

Rex Rollback Frame:

Rex Rollback Bed:

Rex Combine Front and Rear:

Rex Finish Rollback:

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Amazon Affiliate links:

***This is a parts list for the rear section of the truck only. You will need to see the front section for the parts list for the front.***

HSP Diff - (2pcs.) - https://amzn.to/4mpYzJG 

Rear Axles  Only -(4pcs.) Drive stub axle cup- https://amzn.to/3XM10up 

Rear Axles Only - (4pcs.) Dog bone Rear 77mm - https://amzn.to/43g51M5 

Axle Pins - (4pcs.) - https://amzn.to/3SHFxkf 

Belts GT2 6mm x 110mm - (2pcs.) https://amzn.to/42Yprso 

GT2 (2 sets of GT2 20T and GT2 40T) - https://amzn.to/3QFnY3o 

Bearings- (Need 36pcs.  ) 3x6x2.5 bearings) - https://amzn.to/3UczOEz 

Bearings- (Need 8pcs. ) 10x15x4 (6700-2RS) - https://amzn.to/4cPEnfx 

Bearings- (Need 16pcs.) 5x11x4  (MR115-2RS) - https://amzn.to/3VTBK68 

Bearing 8x16x5 (Need 8pcs.)  https://amzn.to/3F0im1w

Shocks 80mm Must be this style (Need 8pcs.) - https://amzn.to/42TnkFk 

5mm Universal joint (Need 2pc.) - https://amzn.to/4iV4KCs 

Tires 2.2" 137mm (Need 4pcs.) - https://amzn.to/3vFPl6J 

10 x 10 Carbon fiber rod 440mm long (4pcs.)  https://amzn.to/42OqLNj 

T8 Lead Screw 300mm (Need 1pcs.) https://amzn.to/4j6PXES 

T8 Collar (Need 2pcs.) https://amzn.to/3FaeE5m 

1/8 inch Collar (Need 1pcs.) https://amzn.to/3YHdlBG 

Servo Winch (Need 1pcs.) https://amzn.to/3YOTDnE 

Servo Wire Extensions (1psc 100mm, 1pcs 300mm) https://amzn.to/3HlXYIK 

TRX4m motor and transmission (Need 1pcs) Works best with 40:1 transmission - https://amzn.to/4mnVDNF or https://amzn.to/4j9tpTT 

TRX4m ESC - https://amzn.to/3F0CFfl

 5mm rod - No drilling - 450mm https://amzn.to/4duoBqX  or 150mm https://amzn.to/42TUc1V

5mm rod cuts:

(2pcs. 450mm) or (6pcs. 150mm)

1pcs. 150mm

1pcs. 128mm

5pcs. 100mm

1pcs. 88mm

6pcs. 50

2pcs. 13mm

Screws: 

M2 

6mm - 33

8mm - 24

10mm - 38

12mm - 50

16mm - 48

20mm - 42

25mm - 6

M3

nuts - 4

Lock Nuts - 12

8mm - 11

10mm - 26

12mm - 10

16mm - 65

20mm - 36

25mm - 62

30mm - 12

M4

Lock Nuts - 4

8mm - 1

M5

Washers - 6

10mm - 2

M8

20mm - 2

Updates:

June 8-2025  Added 5mm rod measure cut tool for vise. 

June 14-2025  The universals only have one set screw. I suggest filing a flat spot on the drive shafts the set screw can bight better and prevent slipping. 

June 17-2025 Side box door - Black Crow Recoery fixed spelling “Recovery” 

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License- Some file sharing platforms are taking files off sites and placing them on their sites without the knowledge of the designer. I am not OK with that. These models are updated here with the feedback given here. I intend to keep the home of this model here. This is the reason for the strict license of this model. I am not concerned with hobbyists sharing and remixing parts of this model, Enjoy