🔥🔥2ND GEAR, MAINSHAFT – 4.0L – 31T – NO I.D. GROOVE – M5R1🔥🔥

🔥 HIGH-QUALITY M5R1 2ND GEAR MAINSHAFT – 4.0L 🔥

Part Description: 2nd Gear (Mainshaft) – 31 Teeth – No Identification Groove Common Part #: M5R1-21A (or equivalent aftermarket)

Fits:

• 1987+ Ford Ranger, Explorer, Explorer Sport Trac, Aerostar (with 4.0L Cologne V6)
• Mazda B4000 (equivalent models)
• M5OD-R1 / M5R1 5-speed manual transmission (2WD & 4WD)

This is the critical 2nd speed gear on the mainshaft — precision-machined with 31 teeth and no I.D. groove (distinguishing it from the 32T version used on smaller engines like 2.3L/3.0L). A worn 2nd gear causes grinding, popping out of gear, or poor shifting under load. Replace it now during your rebuild to restore crisp, reliable performance in your 4.0L truck!