DriveTrain Differentials

This ExST has factory 4.10Ratio Diffs: Rear is LimitedSlip=TractionLok, Fore is OpenSlip Hubless=LiveAxle.
An Axle Inspection+GearOilChange should be done every 33kMiles\4~5Years; Additive+Lube spec below.

Diff Rear

• Type = 4.10Ratio 8i8RingGearDiam 28Spline LmtdSlip 3i25TubeDiam ??i??Wh~WhLgth 3200LbCpty
  
• Ford# raxp-1831-j \ zrhp-1831-j, DiffCoverTag=s663a_4L10_8.8_oh28, DoorLabel=d2_TractionLok
  
• Covr = 10Bolt wOut Drain
  
• FillPlug = 0i500oDia*14mNPThrd*0i375Long*0i375FemaleSquareDrive
  
• Adtv = 4.000oz 0.125qt 0.118Lt FrictionModifier Required Ford# c8az-19b546-a Or AmsOil# SlipLock
  
• Lube = 57.60oz 1.800qt 1.703Lt Ford# 75w140.FullSyn Swapped To AmsOil# SAE250.FullSyn
  

Diff Fore

• Type = 4.10Ratio 8i8RingGearDiam ??Spline OpenSlip ?i??TubeDiam ??i??Wh~WhLgth 3200LbCpty
  
• Ford\DanaSpicer# 35/194/BOM.611044-2, Short+LongArm ConstantVelocity LiveAxles=Hubless
  
• Covr = 10Bolt wOut Drain
  
• FillPlug = 0i500oDia*14mNPThrd*0i375Long*0i375FemaleSquareDrive
  
• Adtv = 4.000oz 0.125qt 0.118Lt FrictionModifier Optional Ford# c8az-19b546-a Or AmsOil# SlipLock
  
• Lube = 102.4oz 3.200qt 3.028Lt Ford# 80w90.BaseOil Swapped To AmsOil# SAE250.FullSyn
  

Links To Related Info

Thanks go to the brave souls who've preceded me in similar adventures & freely shared their experience:

https://www.therangerstation.com/tech_library/axle_codes.shtml Diff Info

https://www.hemmings.com/stories/article/ford-8-8-inch-differentials Diff Info

https://www.explorerforum.com/forums/threads/8-8-axle-facts-and-swap-info.235261 Diff Rear Info

https://thefabricatorseries.com/build-blogs/how-to-narrow-a-ford-explorer-88-rear-axle-part-1-prelude-and-qa Diff Rear Info

https://www.therangerstation.com/tech_library/Ford-8_8-axle.shtml Diff Rear Info

https://www.hotrod.com/articles/ford-rear-axle Diff Rear Info

https://youtu.be/0OpzDnL7MsI?t=0 Diff Rear LubeChange+CoverRepair

https://www.therangerstation.com/tech_library/rebuild_tractionlock.shtml Diff Rear ReBuild+UpGrade

https://www.therangerstation.com/tech_library/dana_35_sla.shtml Diff Fore Info

https://youtu.be/f0MhOijZS7o?t=22 Diff Fore LubeChange