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Dodge used at least 4 different universal joints for gas engine civilian light truck rear driveshafts of the 1961-1993 era. By far the most common joint found through 1989 is the small 7260 series inside c-clip u-joint that fits yokes measuring 2-1/8" between the yoke ears. From 1961 to 1987, heavy duty 3/4 ton and 1 ton trucks typically had hefty 5380 series inside c-clip u-joints that fit yokes with a 3" inside span. Heavy-Duty 1988-1993 gas engine models used 1410 series external snap ring u-joints. 7290 series inside c-clip u-joints fitting yokes with a 2-5/8" inside span can be found on trucks with Big Blocks and many 1990-1993 trucks.
U-Joint Sizes using Inside Lockup (C-Clips fit in cap grooves and seat against inside of yoke ears):
Detroit 7260: Cap Size= 1.078". Span between Yoke Ears = 2.125".
Detroit 7290: Cap Size= 1.125". Span between Yoke Ears = 2.625".
Detroit 5380: Cap Size= 1.231". Span between Yoke Ears = 3.000".
U-Joints Using Outside Lockup (Snap Rings fit in grooves machined in yoke ears and seat against outside face of caps):
Spicer 1410: Cap Size= 1.1875". Overall Installed Width of U-Joint= 4.1875"
SLIP JOINTS: Up through January 2, 1986, the spline size for Slip Stubs and Yokes on 7260 and most 7290 series factory assembled shafts will be a 1-1/4"-16 with an external slip yoke seal. From January 2, 1986 to March 28, 1988, several combinations can be found all of which should have a rubber protective boot. Starting on March 29, 1988 all factory front CV shafts use a 1-9/32" fine spline stub and yoke shielded by QK3078 Boot. 1988 to 1993 Heavy Duty Gas trucks will have Spicer 1410 series driveshafts and 14 or 15 spline based on 16 spline slip yokes.
Due to the age of these vehicles, it is not uncommon to find the original slip joint has been replaced with non-stock part especially on 1986 and older trucks without slip joint boots. For 7260 and 7290 series shafts, the most common replacement slip joint uses a 1-3/8"-16 spline stub and yoke.
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