Part No. S4-3-1751KX Slip Yoke, 1.750" Splines Dia, 1550 Series, Center U Joint To End 5.375
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Specifications S4-3-1751KX · 1550 Series Slip Yoke
- Part number
- S4-3-1751KX
- Part type
- Slip Yoke
- Condition
- New
- Series
- 1550
- Splines count
- 16
- Center u-joint to end
- 5.375
- Splines diameter
- 1.750"
- Weight
- 6 lb
Fitment
Spicer
1550 series parts use 1.375" u-joint bearing caps on a 4.875" snap-ring-to-snap-ring width (nominal). Confirm the cap diameter on the mating yoke or joint before ordering.
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About S4-3-1751KX
Driveline clunk, vibration at a specific speed, and unexplained transmission fluid leaks share a common culprit: a worn slip yoke. The S4-3-1751KX delivers a ready-to-install 1550 series replacement with 16 splines at 1.750"" diameter, purpose-built to solve these symptoms and restore smooth, quiet driveshaft operation.
Diagnosing Slip Yoke Failure
A healthy slip yoke moves smoothly on the output shaft with minimal radial play and no perceptible spline backlash. When the splines wear, the yoke develops side-to-side movement that creates the characteristic low-frequency thud heard during tip-in acceleration. Simultaneously, the scored sliding surface begins to damage the transmission seal, eventually producing a fluid trail on the driveshaft. Replacing the S4-3-1751KX at the first sign of spline wear prevents cascading damage to the seal and output shaft.
Part Specifications
| Specification | Detail |
|---|---|
| Part No. | S4-3-1751KX |
| Series | 1550 |
| Spline Count | 16 |
| Spline Bore | 1.750"" |
| U-Joint CL to End | 5.375" |
| Notes | Spicer |
Confirming the Right Part
The 16-spline, 1.750"" bore is the critical match criterion for your transmission. Count the splines on your output shaft, then measure pitch diameter with a micrometer or vernier caliper across the pitch circle. If the numbers match 16 and 1.750"", the S4-3-1751KX is your correct replacement.
Replacement Procedure Summary
- Mark the rear driveshaft orientation at the differential companion flange
- Slide the driveshaft rearward to disengage the slip yoke from the transmission
- Replace the transmission extension housing seal while you have access
- Slide new S4-3-1751KX onto output shaft -- feel for full spline engagement
- Reconnect rear of driveshaft in marked orientation
- Top off transmission fluid; road test and confirm no leaks
Stocked and Ready
Universal Driveshafts maintains on-shelf inventory of 1550 series slip yokes including the S4-3-1751KX. Fast shipping available. Contact us for fleet pricing or bulk orders.
Not sure which slip yoke you need? Our transmission slip yoke guide covers spline counts, styles, and how to measure.
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S4-3-1751KX questions
What series is S4-3-1751KX?
S4-3-1751KX is a 1550 series slip yoke. Nominal 1550 dimensions are 1.375" bearing caps on a 4.875" snap-ring-to-snap-ring width. Measure the cap diameter on your old joint to confirm the series before ordering.
What spline count does S4-3-1751KX have?
S4-3-1751KX has 16 splines on a 1.750" spline diameter. Count the splines on the output shaft and measure across the major diameter to confirm.
Is S4-3-1751KX in stock?
Yes. 1 is in stock in Florida. Most stock orders placed before 2 pm EST on a weekday ship the same day.