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E-F RTLO-xx913/18 Gearboxes + Diffs

This mod includes both Super 13 & Super 18 transmissions with & without retarders for all seventeen vanilla trucks in a range of the following differential ratio choices (as of v1.39):
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Please read this discussion regarding the 'hidden' gear implementation.
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Higher ratios mean lower gearing which means more torque at a given transmission speed for better load handling, the trade off being higher engine RPM at a given road speed and so lower fuel economy.

The default in-game ratio for these transmissions is 3.55 (13 speed) & 3.25 (18 Speed). If you want to save fuel running lighter (default) loads, choose lower ratios. If you like hauling heavier loads (from mods) and want better load handling from your truck, choose higher ratios.

The transmissions are named in-game as:

"Eaton Fuller Super XX[r] Y.YY rears - fury6"

- where XX will be either 13 or 18 (for RTLO913 & RTLO918 respectively), [r] will either be R or non existant (for retarder and non-retarder respectively) and Y.YY will be the differential ratio.

The gear labels in-game will show as:

Super 13 (RTLO-xx913A)

Super 18 (RTLO-xx918B)
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Mod now supports following 3rd party truck mods:

Kenworth:

• T908
  
• T408
  
• T609/409
  
• T800 (unkown, GTM, TEM)
  
• T610 (GTM)
  
• T600 (Peru, Faster)
  
• 521
  
• K100
  
• K100E
  
• W900B (GTM)
  
• W900 (Big Bob, Ruda, Pinga, Rezworth, ironwerx, Outlaw)
  
• W990
  
• W900A

Peterbilt:

• 389 (Viper2, Ruda, Pinga, Rezbilt, pizzter)
  
• 388 Wrecker
  
• 357 Heavy
  
• 281 (mTG)
  
• 567_GTM
  
• 379 (Outlaw, Dom)
  
• 359 (RTA, FLX, Outlaw, EMT)
  
• 350 (SCR)
  
• 351 (SCR) - Tentative
  
• 281/351
  
• 352 (Unknown, KSW)
  
• 362 (Ruda)
  
• 579 (Peru, Ruda)

Mack:

• Superliner (+ Maxitorque T-3xxLR-21 gearboxes)
  
• Titan/Superliner-II (+ Maxitorque T-3xxLR-21 gearboxes)
  
• B-61
  
• R600 (+ Maxitorque T-3xxLR-21)
  
• Anthem (+ Maxitorque T-3xxLR-21 for the default SCS truck)
  
• MH613 (+ Maxitorque T-3xxLR-21)
  
• CHU-613 (+ Maxitorque T-3xxLR-21)
  
• F700
  
• Pinnacle (+ Maxitorque T-3xxLR-21), (Bormann)
  
• Titan (+ Maxitorque T-3xxLR-21), (Bormann)

International:

• 9300i (unkown, Mr. Overfloater)
  
• 9400i
  
• 9600 (Rushour 109)
  
• 9800
  
• HX520H (Harvan)
  
• Prostar (Jetman)
  
• 5070 (Smarty)

Western Star:

• 4964F
  
• 4800W
  
• 4800SB
  
• 4900 (Blades, Overfloater, Borman)
  
• 6900 (Bormann)

Freightliner:

• Coronado (unknown, Ruda)
  
• Classic XL (Ruda, BSA)
  
• FL86
  
• FLD
  
• FLB
  
• FLC
  
• FLT79 (Borman)
  
• Cascadia 2018
  
• Cascadia 2019
  
• Cascadia 125 (Ruda)
  
• Argosy
  
• Powerliner (Rushour 109)

Volvo:

• VNL
  
• VNR
  
• WIA (TheOtherCorey)

Scot:

• A2HD

Caterpillar

• CT660

Scania:

• T
  
• R
  
• S

Ford:

• LTL-9000
  
• CLT-9000 (Rushour 109)

Autocar:

• DC
  
• AT

Marmon:

• 57P

White:

• 64T (TheOtherCorey)

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[EDIT: 11/2/2018]
Discussion Topic
Gearbox layout files for implementing the 'hidden' gear.

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NOTE: The Mack gearboxes are configured with the undocumented gears and will require the 'hidden' gear specific layouts as per this discussion. (quick-link to download[drive.google.com])

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[EDIT: 21/11/2020]

Due to an unmitigated ♥♥♥♥-up on my part, the v1.39 update for this mod will cause all vehicles using these gearboxes to revert the game's fallback 10 speed box during first run after updating.

Players will therefore need to drive their truck to a service depot and replace the gearbox manually for each of the affected vehicles. Service depot is preferable as trying to upgrade via the truck manager is more likely to crash out the game.

Sincere apologies to everyone affected.