754-04249 754-04249A 954-04249 954-04249A Lower Transmission Drive Belt 5/8" x 71" for Mower Tractor MTD Troy-Bilt 42T 36T 42X TB42 LT3800 LT4200 LT-1700 T110 T85 T100 T105 T1000 T2700 LT2000 LT1500

What It Is

This is a lower transmission drive belt (5/8" wide x 71" long) that connects the engine pulley to the transmission on select MTD and Troy-Bilt lawn tractors. It’s responsible for moving the tractor forward and backward—not the blades. Used on 36", 42", and 42X deck models.

Fitment & Compatibility

Before buying, confirm your tractor’s model number (not just deck size). This belt fits many MTD and Troy-Bilt models including: 42T, 36T, 42X, TB42, LT3800, LT4200, LT-1700, T110, T85, T100, T105, T1000, T2700, LT2000, and LT1500. Check your old belt’s part number—this replaces 754-04249, 754-04249A, 954-04249, and 954-04249A. Measure your existing belt: it must be exactly 5/8" wide and 71" long (outside circumference). If your belt is wider or longer, it won’t fit. This is an aftermarket replacement, not OEM, but matches OEM specs.

Key Things to Know

• Quality: Most buyers report it works as well as OEM, but a few note slightly shorter lifespan under heavy use. Inspect for fraying after 20-30 hours.
• Installation difficulty: Moderate. You’ll need to remove the mower deck and possibly loosen the transmission or idler pulley. Have a wrench set and pry bar handy.
• Common gotcha: The belt routing diagram is often missing from packaging. Snap a photo of the old belt’s path before removing it. Misrouting causes slippage or premature wear.
• Deck clearance: On some 42" decks, the belt may rub the deck housing if the idler pulley is worn. Check and replace the pulley if it’s grooved or wobbly.

Should You Buy It

If you need a reliable, budget-friendly replacement for a worn or broken lower transmission belt on a compatible MTD/Troy-Bilt tractor, this is a solid pick. It’s not built for extreme commercial use, but for residential mowing on flat to slightly hilly terrain, it’s a good value. Just double-check your model number and belt measurements before ordering.