Part No. 6.5-4-3591-1 End Yoke, 1810 Series, 2.390" Splines Dia, 2.875" Hub Dia
In stock11 ready to ship
Most stock parts ship the same day when ordered before 2pm EST; processing times may vary.
- Free shipping on parts orders over $1,000
- 14-day returns
- Fitment help: (813) 524-6491
Specifications 6.5-4-3591-1 · 1810 Series End Yoke
- Part number
- 6.5-4-3591-1
- Part type
- End Yoke
- Condition
- New
- Series
- 1810
- Style
- HR
- Splines count
- 46
- Splines diameter
- 2.390"
- Through hole
- 2.750"
- Bore type
- splined
- Hub diameter
- 2.875
- CJ to end
- 5.500"
- Weight
- 18.3 lb
Fitment
HUB DIAMETER NOT GROUND
1810 series parts use 2.125" u-joint bearing caps (nominal). Confirm the cap diameter on the mating yoke or joint before ordering.
Interchange / cross-reference
- N6.5-4-3591-1
- P6.5-4-3591-1
6.5-4-3591-1 replaces or interchanges with N6.5-4-3591-1, P6.5-4-3591-1. Cross-reference numbers are supplied for identification; compare the series, spline and bolt-pattern dimensions above before substituting.
Estimate shipping to your ZIP
Estimate shipping
Live UPS rates from our shop in Florida. Parts orders over $1,000 ship free — tubing and complete driveshafts always ship at the UPS rate.
Local pickup in Florida — free
About 6.5-4-3591-1
The 6.5-4-3591-1 end yoke from UDS is defined by its precise dimensional stack: 2.390-inch spline diameter, 2.875-inch hub, and a center-U-joint-to-end measurement of 5.500". These numbers must match your output shaft exactly -- a fraction of an inch off means the yoke will not fit or will fail prematurely.
Full Specification Breakdown
Selecting this yoke requires cross-checking every dimension against your application. The specifications below represent the actual machined dimensions, not nominal values. Measure your existing yoke or output shaft before ordering.
| Specification | Value |
|---|---|
| Series | 1810 Series |
| Spline Diameter | 2.390" |
| Spline Count | 46 |
| Hub Diameter | 2.875" |
| Center U-Joint to End | 5.500" |
| Through Hole Diameter | 2.750" |
| Snap Ring Style | HR |
| Application Note | HUB DIAMETER NOT GROUND |
| Brand | UDS |
Snap Ring and Retention System
This yoke uses a HR design, which dictates the U-joint cap retention method. 1810 Series applications overwhelmingly use this style due to its serviceability and load rating. When replacing a worn yoke, the snap ring style must be preserved -- mixing OSR and ISR yokes with mismatched U-joints leads to cap ejection under torque.
- Retention style: HR
- Through bore ID: 2.750" -- critical for shaft clearance
- Hub OD: 2.875" -- registers against companion flange or seal bore
- Application notes: HUB DIAMETER NOT GROUND
Why Dimensional Accuracy Matters
In driveshaft engineering, yoke geometry directly controls phasing, balance, and operating angles. A yoke with oversized spline bores will develop rotational slop that amplifies vibration at highway speed. Undersized bores damage output shaft splines during installation. The 6.5-4-3591-1 is manufactured to match the 1810 Series standard, which is also the OEM specification for the vehicles in this application class.
For high-torque applications -- diesel pickups, off-road builds, and towing rigs -- always upgrade to a forged yoke in the appropriate series rather than reusing worn stock components.
Part 6.5-4-3591-1 is a UDS product. Universal Driveshafts stocks a complete range of 1810 Series end yokes, U-joints, and driveshaft components. Contact our technical team for fitment assistance.
New to end yokes? Our end yoke guide explains splines, snap-ring styles, and how to measure.
Related End Yokes in the 1810 series
See the full table
6.5-4-1891
End Yoke, 1810 Series, 2.350" Splines Dia, 2.875" Hub Dia
$116.26In stock
6.5-4-1891-1
End Yoke, 1810 Series, 2.350" Splines dia, 2.875" Hub Dia
$164.92In stock
6.5-4-4631
End Yoke, 1810 Series, 2.794" Splines Dia, 54 Spline
$261.34In stock
6.5-4-4631-1
End Yoke, 1810 Series, 2.794" Splines Dia, 54 Spline
$217.13In stock
6.5-4-4571XU
End Yoke - Series 1810 - BP Style
$117.54In stock
3104-26CV
End Yoke, 1310 Series, 26 Splines, Style CV
$48.27In stock
3104-05
End Yoke, 1.188" Splines Dia, 1310 Series, 1.521" Hub Dia
$84.60In stock
3104-231
End Yoke, 1.26" Splines Dia, 1.562" Hub Dia, 23 Spline
$104.94In stock
6.5-4-3591-1 questions
What series is 6.5-4-3591-1?
6.5-4-3591-1 is a 1810 series end yoke. Nominal 1810 dimensions are 2.125" bearing caps. Measure the cap diameter on your old joint to confirm the series before ordering.
What spline count does 6.5-4-3591-1 have?
6.5-4-3591-1 has 46 splines on a 2.390" spline diameter. Count the splines on the output shaft and measure across the major diameter to confirm.
What part numbers does 6.5-4-3591-1 replace?
6.5-4-3591-1 cross-references to N6.5-4-3591-1, P6.5-4-3591-1. Interchange data is for reference; compare the dimensions before substituting.
Is 6.5-4-3591-1 in stock?
Yes. 11 are in stock in Florida. Most stock orders placed before 2 pm EST on a weekday ship the same day.