Common Terms

Common Terms Definition
Bearing Plate
A retainer plate fixed to the back of a round bearing used to position the bearing in the yoke.
Balancing
A procedure in which the distribution of mass in a rotating body is checked and altered where necessary to ensure that vibration does not occur during operation.
Ball Seat
A full or segmented angular contact bearing located in a socket that supports and centers the ball stud.
Ball Stud
A yoke generally used in CV applications which incorporates a stud onto which a ball is mounted
Brinnelling
Failure that occurs when the static forces between two curved surfaces in contact result in local yielding of one or both mating members to produce permanent surface discontinuity. Example: Needle roller indents on a u-joint trunnion or trunnions
Cardan Universal Joint
A non-constant velocity universal joint consisting of two yokes connected by a cross through four bearings and driveable by external sources.
Center Support
A rolling bearing element surrounded by rubber, mounted in a bracket configuration used to mount the support to an outside structure.
Centering Socket Yoke
A yoke assembly that functions as a self-aligning bearing and provides support and a means of centering in double cardan universal joints.
Companion Flange
A flanged member that attaches a driveline to drivetrain components, typically affixed by some bolt-together method.
Critical Speed
The speed at which the rotational speed of a shaft coincides with the natural vibration frequency of the shaft, causing a dynamically unstable condition.
Cross and Bearing Kit
Drive member with four equally spaced trunnions in the same plane and four bearing cups with attaching parts. Also referred to as a universal joint kit or u-joint kit.
Cross Hole
A through hole located in each ear of a yoke used to locate a round bearing.
Double Cardan Universal Joint
A near constant velocity universal joint consisting of two trunnion type Cardan universal joints whose trunnion yokes are connected by a coupling yoke or H-yoke with internal supporting and centering means.
Driveline
An assembly of one or more driveshafts with provisions for axial movement, which transmits torque and/or rotary motion.
Driveshaft
An assembly of one or two universal joints connected to a solid or tubular shaft member.
Driveshaft Length Center to Center
The distance between the outermost universal joint centers on a driveshaft.
Drive Train
Term used for the unit of all components from the Transmission to Rear differential. Also referred to as Power Train.
Ear
One of two projecting parts of a yoke symmetrically located with respect to the rotational axis.
End Yoke
A yoke which attaches a driveshaft to another drive train component such as the transmission.
Flange Yoke
The yoke which attaches the driveshaft assembly to a companion flange.
Flinger
A protective shield used in front of and behind the bearing and rubber on many center supports and end yokes.
Galling
Failure that occurs when two sliding surfaces are subjected to such a combination of loads, sliding velocities, temperatures, environments, and lubricants, that massive surface destruction is caused by welding and tearing, plowing, and gouging. Example: Bearing cup/trunnion end galling on a cross and bearing kit.
Glidecote
The blue, nylon, wear-resistant coating on yoke shafts and tube shafts.
H-Yoke
A double yoke which connects the two halves of a double cardan universal joint.
Half Round Yoke Cross Hole
A semicircular hole located on the end of each ear of some end yokes and used to locate a round bearing.
Hub
The central part of a yoke used for attachment to another member.
Inside Lock-up
Term referring to either a cross and bearing kit or a yoke that utilizes a snap ring seated in a groove in the bearing cups and located inside the yoke ears to retain the kit in the yoke.
Joint Angle
The angle described by the intersection of rotational axis of the input and output members of a universal joint and measured on the same plane described by these areas.
Knuckle
A slange term used when referring to some driveshaft joint parts and components.
Liner
A sound and vibrational deadening material added to the inside surfaces of a tube.
Midship Stub Shaft.
A short shaft, generally splined, used in applications requiring more than one driveshaft. It mounts through the center of a support bearing and allows an additional driveshaft component to be fixed.
Outside Lock-Up
Term referring to either a cross and bearing kit or a yoke that utilizes a retaining ring in a groove near the outside edge of the yoke ear, rested against the outside face of the bearing cup.
Phase/Phase Angle
The relative positioning of the universal joint yokes on a driveshaft or driveline.
Retaining Ring
A removable ring used as a shoulder to retain and position a round bearing in a hole.
Ring Groove Round Bearing
The surface used for positioning a round bearing with a retaining ring. Consists of a round bearing cup with needle rollers designed to ride on a trunnion.
Seal
A flexible member which prevents the escape of lubricant and the entrance of foreign matter.
Slip Movement
A permissible length of axial movement.
Slip Stub Shaft
A short, machined shaft, generally splined, which, when used with a slip yoke allows axial movement.
Slip Yoke
A yoke which allows axial movement.
Snap Ring
Same as RETAINING RING.
ContentStrap Bearing Clamp
A semi circular device that conforms to the bearing profile holding them in place in half round and some DC yokes.
Swaged Tubing
A tube with one or both ends having a smaller diameter then the middle section.
Swing Diameter
The maximum diameter of the circular path described by a rotating universal joint.
Thrust End
The end of a cross trunnion used as a thrust surface.
T.I.R.
Total Indicator Reading on a specific point thru 1 revolution of a shaft.
Torsional Damper
A mechanical device, generally an inertia ring, attached to a drivetrain component by means of a rubber inner ring to minimize driveline vibration in addition to balancing.
Trunnion
One of four projecting journals of a cross.
Tubing
The tubular connecting member of a driveshaft.
Tube Diameter
The outside diameter of a tube.
Tube Yoke
A yoke with a piloting hub for attachment of a tube.
U-Bolt
A clamping bolt with two parallel threaded legs used to retain a round bearing in certain end yoke designs.
Universal Joint
A device which can transmit torque and/or rotary motion from one shaft to another at fixed or varying angles of intersection of the shaft areas.
Wall Thickness
The measurement between the inside and outside diameter of a tube.
Weld Yoke
Same as tube yoke.
Wing Bearing
A member with a key and projecting wings used as the bearing base and positioning the thrust end of a cross trunnion.
Yoke Shaft
A one piece member designed to incorporate a tube yoke, tubing and stub shaft. It is used in close-couple applications and eliminates the need to use tubing.
Zerk
A lubrication fitting, usually threaded into a driveline component that will allow grease to be injected into the component, but does not allow grease to escape.

Two Piece Driveshaft: Flange

Two Piece Driveshaft Measuring Flange to End Yoke

IMPORTANT: Vehicle must be on a level surface with suspension at normal ride height for proper measurements. When measuring to the center bearing, measure to the center of the round or slotted carrier bearing bolt holes.  Many carrier mounts are slotted for adjustment.

DriveShaft Length

Measurement (A) :
Measure from the transmission output flange face to the center of the carrier bearing bolt holes.

Measurement (B) :
Measure from the center of carrier bearing bolt holes to the flats (center of u-joint or flats) on the end yoke at the differential.

Two Piece Driveshaft Measuring Flange To Flange

IMPORTANT: Vehicle must be on a level surface with suspension at normal ride height for proper measurements. When measuring to the center bearing, measure to the center of the round or slotted carrier bearing bolt holes.  Many carrier mounts are slotted for adjustment.

DriveShaft Length

Measurement (A):
Measure from the transmission output flange face to the center of the carrier bearing bolt holes.

Measurement (B) :
Measure from the center of carrier bearing bolt holes to the face of the flange on the differential.

Two Piece Driveshaft: Rubber Boot Extension

Two Piece Driveshaft Measuring Rubber Boot Extension to End Yoke

IMPORTANT: Vehicle must be on a level surface with suspension at normal ride height for proper measurements. When measuring to the center bearing, measure to the center of the round or slotted carrier bearing bolt holes.  Many carrier mounts are slotted for adjustment.

DriveShaft Length

Measurement (A) :
Measure from end of rubber boot extension on the transmission to the center of the carrier bearing bolt holes.

Measurement (B) :
Measure from the center of carrier bearing bolt holes to the end yoke flats (center of u-joint or flats) on the differential.

Measurement (C) :
Measure from the end of the rubber boot extension to end the of the transmission output/spline. If spline is recessed in rubber boot Extension, enter ø.

Two Piece Driveshaft Measuring Rubber Boot Extension to Flange

IMPORTANT: Vehicle must be on a level surface with suspension at normal ride height for proper measurements. When measuring to the center bearing, measure to the center of the round or slotted carrier bearing bolt holes.  Many carrier mounts are slotted for adjustment.

DriveShaft Length

Measurement (A) :
Measure from end of rubber boot extension on the transmission to the center of the carrier bearing bolt holes.

Measurement (B) :
Measure from the center of carrier bearing bolt holes to the flange face on the differential.

Measurement (C) :
Measure from the end of the rubber boot extension to end the of the transmission output/spline. If spline is recessed in rubber boot Extension, enter ø.

Two Piece Driveshaft: End Yoke

Two Piece Driveshaft Measuring End Yoke To End Yoke

IMPORTANT: Vehicle must be on a level surface with suspension at normal ride height for proper measurements. When measuring to the center bearing, measure to the center of the round or slotted carrier bearing bolt holes.  Many carrier mounts are slotted for adjustment.

DriveShaft Length

Measurement (A):
from the transmission output end yoke (center of u-joint or flats) to the center of the carrier bearing bolt holes.

Measurement (B):
Measure from the center of carrier bearing bolt holes to the end yoke (center of u-joint or flats) on the differential.

Two Piece Driveshaft Measuring End Yoke To Flange

IMPORTANT: Vehicle must be on a level surface with suspension at normal ride height for proper measurements. When measuring to the center bearing, measure to the center of the round or slotted carrier bearing bolt holes.  Many carrier mounts are slotted for adjustment.

DriveShaft Length

Measurement (A) :
Measure from the transmission output end yoke (center of u-joint or flats) to the center of the carrier bearing bolt holes.

Measurement (B) :
Measure from the center of carrier bearing bolt holes to the face of the flange on the differential.

Two Piece Driveshaft: Seal

Seal to End Yoke

 IMPORTANT: Vehicle must be on a level surface with suspension at normal ride height for proper measurements. When measuring to the center bearing, measure to the center of the round or slotted carrier bearing bolt holes.  Many carrier mounts are slotted for adjustment.

DriveShaft Length

Measurement (A) – Front Driveshaft Length:
Measure from end of rubber seal on the transmission to the center of the carrier bearing bolt holes.

Measurement (B) – Rear Driveshaft Length:
Measure from the center of carrier bearing bolt holes to the end yoke flats (center of ujoint) on the differential.

Spline Extrusion Length

Measurement (C) – Spline Extrusion Length:
Measure from rubber seal to end the of the transmission output/spline. If spline is recessed in rubber seal, enter ø.

Seal to Flange

 IMPORTANT: Vehicle must be on a level surface with suspension at normal ride height for proper measurements. When measuring to the center bearing, measure to the center of the round or slotted carrier bearing bolt holes.  Many carrier mounts are slotted for adjustment.

DriveShaft Length

Measurement (A) – Front Driveshaft Length:
Measure from end of rubber seal on the transmission to the center of the carrier bearing bolt holes.

Measurement (B) – Rear Driveshaft Length:
Measure from the center of carrier bearing bolt holes to the end yoke flats (center of ujoint) on the differential.

Spline Extrusion Length

Measurement (C) – Spline Extrusion Length:
Measure from rubber seal to end the of the transmission output/spline. If spline is recessed in rubber seal, enter ø.

Inside Snap Ring Style Transmission Slip Yoke

E.) Cap Diameter:
Diameter measured over bearing cap space.

F.) Width:
Distance Measured Between Machined Flats

Common Inside Snap Ring U-joint Sizes and series

Series Width Cap Diameter
7260 CHRYSLER
2 1/8″ = 2.125
1 5/64″ = 1.078
7290 CHRYSLER
2 5/8″ = 2.625
1 1/8″ = 1.125
3R GM
2 9/16″ = 2.563
1 1/8″ = 1.125

Outside Snap Ring Style Transmission Slip Yoke

E.) Cap Diameter:
Diameter measured over bearing cap space.

F.) Width:
Distance measured over compressed bearing cap.

Common Outside Snap Ring U-joint Sizes and series

Series Width Cap Diameter
1210
2 7/16″ = 2.438
1 1/16″ = 1.063
1310
3 7/32″ = 3.219
1 1/16″ = 1.063
1310 FORD*
3 7/32″ = 3.219
1 1/8″ = 1.125
1330
3 5/8″ = 3.625
1 1/16″ = 1.063
1330 FORD*
3 5/8″ = 3.625
1 1/8″ = 1.125
1350
3 5/8″ = 3.625
1 1/16″ = 1.063
1410
4 3/16 = 4.188
1 3/16″ = 1.188
1415**
4.178
1 3/16″ = 1.188
1480
4 3/16 = 4.188
1 3/8″ = 1.375
1485**
4.178
1 3/8″ = 1.375
1550
4 31/32″ = 4.969
1 3/8″ = 1.375
1555**
4.9464
1 3/8″ = 1.375

Inside Snap Ring Style End Yoke

Width: measure from the inside flat of one yoke ear to the inside flat of the other ear

Cap Diameter: measure the width of the opening where the cap sits in the yoke

Common Inside Snap Ring U-Joint Sizes and series

Series Width Cap Diameter
7260 CHRYSLER
2 1/8″ = 2.125
1 5/64″ = 1.078
7290 CHRYSLER
2 5/8″ = 2.625
1 1/8″ = 1.125
3R GM
2 9/16″ = 2.563
1 1/8″ = 1.125

Outside Snap Ring Style End Yoke

Width: measure from inside of tab to inside of tab. If you do not see a tab as shown, then you have an inside snap ring U-Joint.

Cap Diameter: measure the width of the opening where the cap sits in the yoke

Common Outside Snap Ring U-Joint Sizes and series

Series Width Cap Diameter
1210
2 7/16″ = 2.438
1 1/16″ = 1.063
1310
3 7/32″ = 3.219
1 1/16″ = 1.063
1310 FORD*
3 7/32″ = 3.219
1 1/8″ = 1.125
1330
3 5/8″ = 3.625
1 1/16″ = 1.063
1330 FORD*
3 5/8″ = 3.625
1 1/8″ = 1.125
1350
3 5/8″ = 3.625
1 1/16″ = 1.063
1410
4 3/16 = 4.188
1 3/16″ = 1.188
1415**
4.178
1 3/16″ = 1.188
1480
4 3/16 = 4.188
1 3/8″ = 1.375
1485**
4.178
1 3/8″ = 1.375
1550
4 31/32″ = 4.969
1 3/8″ = 1.375
1555**
4.9464
1 3/8″ = 1.375

INSIDE SNAP RING STYLE U-JOINT

Width:
U Joint: Please measure the distance to the outer edge of the snap ring grooves.

End Yoke: Please measure from the inside flat of one yoke ear to the inside flat of the other ear

Use the picture above for reference

Cap Diameter:
U Joint: Simply measure the U-Joint cap.

End Yoke: Please measure the width of the opening where the cap sits in the yoke.

Use the picture above for reference

Common Inside Snap Ring U-joint Sizes and Series

Series Width Cap Diameter
7260 CHRYSLER
2 – 1⁄8 (2.125)
1 – 5⁄64 (1.078)
7290 CHRYSLER
2 – 5⁄8 (2.625)
1 – 1⁄8 (1.125)
3R GM
2 – 9⁄16 (2.563)
1 – 1⁄8 (1.125)
2R GM
2.342
1.00

OUTSIDE SNAP RING STYLE U-JOINT

Width:
U joint: Please compress the caps and measure from outside of cap to outside of cap .
End Yoke: Please measure from inside of tab to inside of tab, using the picture above for reference, If you do not see a tab as shown, then you have an inside snap ring u joint.
Use the picture above for reference

Cap Diameter:
U joint: Simply measure the U-Joint cap diameter .
End Yoke: Please measure the width of the opening where the cap sits in the yoke. use the picture above for reference
Use the picture above for reference

Common Outside Snap Ring U-joint Sizes and Series

Series Width Cap Diameter
1210
2 7/16″ = 2.438
1 1/16″ = 1.063
1310
3 7/32″ = 3.219
1 1/16″ = 1.063
1310 FORD*
3 7/32″ = 3.219
1 1/8″ = 1.125
1330
3 5/8″ = 3.625
1 1/16″ = 1.063
1330 FORD*
3 5/8″ = 3.625
1 1/8″ = 1.125
1350
3 5/8″ = 3.625
1 1/16″ = 1.063
1410
4 3/16 = 4.188
1 3/16″ = 1.188
1415**
4.178
1 3/16″ = 1.188
1480
4 3/16 = 4.188
1 3/8″ = 1.375
1485**
4.178
1 3/8″ = 1.375
1550
4 31/32″ = 4.969
1 3/8″ = 1.375
1555**
4.9464
1 3/8″ = 1.375

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