Dana Spicer D27  

Dana 28  
10 bolt front cover with 27 spline. Found in mid-size Ford front applications.

Dana 30   
10 bolt cover with 7.2" ring gear

Dana 44   
10 bolt cover with 8.5" ring gear. Found in both front and rear applications.
Rear applications use a bolt in axle. Axles are 30 spline.
Front applications came in both standard and reverse rotation

Dana 60   
10 bolt cover with 9.75" ring gear. Found in both standard and reverse rotation. Axle spline counts range from 16 to 35.

Dana 70  
10 bolt cover with 10.5" ring gear. Has full floating axles with 30 or 35 spline.

Dana 80  
10 bolt rear cover with 11.25" ring gear. Could have 35 or 37 spline axles.
Later model fords use different pinion bearings than all other models.