BorgWarner BW1345

BW1345 Transfer Case Specs & Information

The BorgWarner BW1345 (BW 13-45, alternatively) is a part time, chain driven transfer case found in 1980's Ford F-Series pickups and Broncos. It's two piece, aluminum case is easily recognizable and it is distinguishable from the similar BW1356 by inspecting the ribs cast into the case - the 1345 has noticeably more webbing. Available only as a manual shift unit, this transfer case has an internal oil pump that keeps the entire system well lubricated during use.

The BorgWarner BW1345, alternatively BW13-45, is a chain driven transfer that was used in the Ford F-Series (F-150/250/350) from 1980 to 1988 and the Ford Bronco from 1980 to 1989. It uses an cast aluminum, two piece case, meaning that the case can be split latitudinally by removing a series of bolts that holds the two housings together, revealing the chain drive system. As with most modern chain driven transfer cases, the BW1345 requires ATF for lubrication. Use of heavier gear oils may prematurely damage the components and are not compatible with the unit's internal fluid pump, which provides lubrication to the bearings.

BW1345 Specs




Part time, chain drive


1980 - 1988 Ford F-Series, 1980 - 1989 Ford Bronco

Case Material:

Aluminum, two piece

Shift Type:

Manual shift




High Range:

1.00 : 1 (direct)

Low Range:

2.72 : 1

Input Splines:

31 spline

Output Splines:

31 spline

Pass/Driver Drop:

Driver's side drop

Fluid Type:


Fluid Capacity:

3 quart (6 pint) capacity


Small metal tag, usually on back side of transfer case, has model "1345" stamped into it. Case is aluminum, ribbed, and can be split down the middle (two piece casting).