The Meritor RRL20145 or RRL20145R390 is a rear-rear locking differential carrier with a 3.90 gear ratio. Designed for the rear-rear axle position in tandem drive axle configurations, the locking differential provides driver-controlled traction by mechanically locking both axle shafts together under low-traction conditions. Part number RRL20145R390 encodes the ratio directly: R390 denotes the 3.90 final drive ratio. This unit is sold on an exchange basis through Pro Gear and Transmission. Core charges apply and are subject to manufacturer core policy upon return and inspection. Not sure this is your part? Give us a call to confirm the proper ratio and axle position for your application.
A refundable core charge of $1,000.00 applies to this item and will be collected at checkout. The core charge is refunded upon receipt of your returned core, subject to its condition; customer is responsible for return shipping. Call us at (877) 776-4600 for details.
Features
Meritor part number RRL20145 or RRL20145R390
3.90 gear ratio rear-rear locking differential carrier
Designed for the rear-rear axle position in tandem drive axle setups
Locking differential mechanically locks both axle shafts for improved traction
Sold on exchange basis - core charges apply per manufacturer core policy
Contact Pro Gear and Transmission to verify fitment for your specific axle configuration
