Adding my experience to this thread. The Valuecraft were on sale from Autozone at $15.99 each so I had to give it a try.
TL;DR: For a 1991-1995 MerCruiser Alpha One Gen II, the automotive u-joint
Valuecraft 1-6301VC (NAPA store brand of Neapco 1-6301) is a confirmed direct physical fit for the Sierra 18-2104 / Mercury 75832T 1 cross. Installed perfectly, no mods needed. One thing to know: its trunnion measures .650" vs. .700" on the genuine Sierra/Mercury part, so it's a proven fit but not an identical load rating — fine for most recreational use, worth considering if you're running a high-horsepower package.
Automotive U-Joint Cross-Reference for Alpha One Gen II (1991-1995) — Confirmed Fit + Measurements
Application: MerCruiser Alpha One Gen II, 1991-1995 Serial range: 0D469859 - 0F679999 (USA)
OEM / Standard Marine Replacement Reference:
- Mercury Marine OEM: 75832T 1 (CROSS/BRG ASSY-HD)
- Sierra Marine OEM match: 18-2174 (Universal Joint 75832A3)
- Sierra Marine OEM match: 18-2104 (U-Joint)
Automotive Cross-Reference (confirmed physical fit): I installed
Valuecraft 1-6301VC (NAPA house-brand, same base part as Neapco 1-6301) in place of the Sierra 18-2104. These are the automotive cross-references for this joint that I've compiled from various sources — the Valuecraft/Neapco 1-6301 branch is the one I can personally confirm fits:
- Rockford K1306
- Detroit 7260
- Neapco 1-6300 / 1-6301
- Precision (Moog) 315G / 320
- Precision RL7260
- Spicer 5-789X
- Rockwell/Meritor CP1306X
- Rockwell/Meritor CP72625-3
- Rockwell/Meritor CP72625-4
- Rockwell/Meritor CP726251-2
- Borg Warner 114-266
- Mopar D-134A
- Mopar D-207
- Chrysler 858001
- Chrysler 1752624
- Chrysler 2298908
- Chrysler 2298909
- Chrysler 3780250
- Chrysler 4364400
- Chrysler 4384514
Car this crosses to: 1987 Chrysler Fifth Avenue
Joint dimensions:
- Style: ISR (Inside Snap Ring)
- Distance between retaining rings: 2.125"
- Cap outside diameter: 1.078"
- Measured trunnion diameter (Valuecraft 1-6301VC): .650" (for reference, the genuine Sierra/Mercury OEM joint measures .700" at the trunnion — so this automotive cross runs slightly smaller in the load-bearing cross itself, even though the cap/snap-ring dimensions match)
Fitment notes:
- Installed perfectly in the Alpha One Gen II application — no modification needed to caps, snap rings, or yoke.
- There's plenty of clearance for the grease zerk fitting to sit in the corner of the cross rather than dead-center, if that's how your particular joint is machined — doesn't interfere with anything in this application.
Caveat for other readers: the smaller trunnion diameter vs. genuine marine spec is worth knowing about if you're running a higher-horsepower engine package or push the drive hard — this is a documented physical fit, not a guarantee of identical load rating to the OEM Sierra/Mercury part. Do your own risk assessment for your engine/use case.
