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Motive Gear 1386591005

Motive Gear 1386591005

$61.25
$61.25
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The Motive Gear Synchro Kit 1386591005 is a precision replacement synchronizer assembly for New Venture NV3500 manual transmissions found in 1996–2004 Chevy and GMC 1500 pickups and SUVs. When second gear grinds on upshifts and third gear pops out, worn synchros are the culprit.

This kit includes the synchronizer hub, sleeve, keys, springs, and blocking rings for one gear position. Constructed from 8620 alloy steel case-hardened to 58–60 HRC, the hub and sleeve are ground to tolerances of 0.0005 inches. The brass blocking rings feature precision-machined friction cone angles within 0.5 degrees of factory specification for positive engagement.

Worn synchros shed metal particles that contaminate fluid and accelerate bearing wear. The Motive Gear 1386591005 restores factory-clean engagement without the notchiness or grinding that plagues a tired transmission. Combined with fresh fluid and a shift bushing kit, this synchro can make a clapped-out NV3500 feel like new for another 100,000 miles.

Grinding second gear? Fix it for good with the Motive Gear 1386591005. Rebuild your NV3500 and get back to smooth shifting.
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Frequently Asked Questions

What transmission models use the Motive Gear 1386591005 manual transmission synchro?

The Motive Gear 1386591005 is a replacement synchronizer designed for specific manual transmissions, typically found in GM, Ford, or Dodge applications that use a T5, T56, or similar transmission with brass or carbon-fiber synchro rings. Synchronizers are transmission-specific, so you must match the synchro to your transmission model, gear position, and hub design. Consult Motive Gear's catalog or a transmission specialist to confirm the 1386591005 fits your exact gearbox.

How do I know if the Motive Gear synchro is made from brass or carbon fiber material?

The Motive Gear 1386591005 synchro is typically manufactured from high-quality brass alloy or a performance carbon-fiber composite, depending on the application and whether it is an OEM replacement or a high-performance upgrade. Brass synchros provide smooth, reliable engagement for street driving, while carbon-fiber synchros offer faster engagement and higher heat resistance for racing. Check the product specifications to confirm which material is used for this specific part number.

How do I know if my manual transmission synchros are worn and need replacement?

Worn manual transmission synchros typically cause grinding when shifting into second or third gear, a notchiness when moving the shifter into gear, or a whining noise in neutral with the clutch released. If your transmission grinds when shifting quickly or refuses to engage a gear smoothly at higher RPM, the synchro rings and hubs on that gear are likely worn. Replacing worn synchros with parts like the Motive Gear 1386591005 restores smooth shifting and prevents further damage to the gear teeth.

Do I need to replace other transmission parts when installing a new Motive Gear synchro ring?

When replacing a synchro ring like the Motive Gear 1386591005, it is recommended to also inspect and replace the hub and slider assembly, shift keys, and the gear blocker ring if they show wear to ensure proper synchronizer function. The synchro hub and slider teeth can wear together, and mismatching old and new parts can cause incomplete engagement or continued grinding. A full synchro rebuild kit that includes all hub components, keys, springs, and rings is the most reliable approach.

Can I install the Motive Gear synchro ring without removing the transmission from the vehicle?

No, replacing a synchro ring like the Motive Gear 1386591005 requires removing the manual transmission from the vehicle and disassembling the gearbox to access the synchronizer assembly on the affected shaft. The transmission must be fully disassembled to remove the main shaft, press off the old synchro hub, and install the new components. This is a job best suited for a transmission specialist or experienced DIY mechanic with the proper tools including a press and snap-ring pliers.

What tools are needed to install Motive Gear manual transmission synchros?

Installing the Motive Gear 1386591005 synchro requires a transmission press, snap-ring pliers, a brass or soft-faced hammer, feeler gauges, and potentially a dial indicator to measure endplay after reassembly. The synchro hub must be pressed onto the transmission shaft to the exact depth specified in the service manual to maintain proper gear alignment and engagement travel. Using a shop press with a bearing separator tool prevents damage to the new synchro components during installation.