Fitment of Drive Shaft Mounted Covers
Heavy truck drive lines are specified according to engine torque & intended use. Unlike autos, Year Make Model is irrelevant. To make part selection easy, Protector U-Joint Covers are separated into kits by driveshaft diameter, then U-Joint size (series).
Step 1.
Measure the drive shaft outside diameter (O.D.) with a diameter tape measure or deep jaw calipers. Drive shaft mounted cover kits are part numbered according to (a) Shaft Diameter (b) Standard or Large U-joints (DS or DL respectively). *Tip: you can also use a C-Clamp & measure between..
Example; 4625DSK fits a 4.625" (4-5/8") O.D. drive shaft with Standard U-Joints.


Step 2.
Determine the U-Joint size. Heavy duty U-Joints are separated into 2 size ranges; 1710 (approx. 6.4" to 6.9" u-joint cross) & 1810 (approx. 7.0" to 8.2" u-joint cross). The part number alpha suffix identifies the U-Joint series covered:
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DSK = Drive shaft mounted, Standard U-Joint, Kit.
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DLK = Drive shaft mounted, Large U-Joint, Kit.
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DSK Suffix
Fits: 1610, 1710, SPL170, SPL 250, SPL350, RPL20 U-Joints
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DLK Suffix
Fits: 1760, 1810, 1880, RPL25
U-Joints
Step 3.
Using the dimension information from steps 1 & 2, select the kit that fits your drive line.
HELPFUL INFO
Print or download from the links below.
View, download or print the fitment guide above.
Protector U-Joint Covers are designed for simple installation, trouble-free use and easy service of the driveline with covers in place.
Ever heard someone say; "don't use greaseable u-joints, they break".. ? Most likely, the u-joints were 'clocked' incorrectly. Here's a visual guide to help.