Riyhch Transmission Oil Pan for GM TH250 TH350 - Direct-Fit Replacement with Drain Plug, Gasket & Bolts

Riyhch Transmission Oil Pan with Drain Plug is a direct-fit replacement oil pan kit designed for GM TH250, TH250C, TH350 and TH350C transmissions, including gasket and mounting bolts for a straightforward swap.

This replacement transmission oil pan from Riyhch is built to match the bolt pattern and depth requirements for popular GM 3-speed automatic transmissions. It ships complete with a molded gasket, mounting bolts and a full-width drain plug so you can service fluid without removing the pan. The pan is offered as a durable aftermarket alternative to the original SP8491BK-style assemblies, intended for routine maintenance and repairs.

Will this pan fit my TH250, TH250C, TH350 or TH350C transmission?

The Riyhch pan is made to fit the common bolt pattern and flange dimensions used on TH250/TH250C and TH350/TH350C families. Confirm fit by comparing the replacement part reference (SP8491BK) and the transmission model stamped on your vehicle.

• Compatible with GM TH250, TH250C, TH350 and TH350C units.
• Replaces parts sold under reference SP8491BK.
• Check vehicle build date and transmission tag to ensure match.

How durable is the Riyhch transmission oil pan and what materials are used?

The pan is manufactured from a robust metal alloy intended for long service life and resistance to road debris and heat. The surface finish resists corrosion and the drain plug threads are reinforced to withstand repeated fluid changes.

• Heavy-gauge metal construction for strength and dent resistance.
• Corrosion-resistant coating for extended life in wet conditions.
• Reinforced drain plug for repeated maintenance cycles.

What is included and how easy is installation?

The kit arrives with the oil pan, a pre-cut gasket and the necessary mounting bolts plus a threaded drain plug. Installation is intended to be straightforward for someone with basic mechanical skills, though a professional installation is recommended if you lack experience.

• Complete kit: pan, gasket, bolts and drain plug supplied.
• No printed instructions included; professional installation recommended if unsure.
• Designed for bolt-on replacement with common hand tools.

How does the drain plug improve maintenance compared with pan removal?

The integrated drain plug allows most of the transmission fluid to be emptied without removing the entire pan, reducing mess and lowering service time. It helps during routine fluid changes while still allowing a full pan removal when a filter change or inspection is required.

• Drain plug enables quick fluid evacuation for faster oil changes.
• Reduces risk of spilling fluid during service.
• Makes interim maintenance simpler between full pan removals.

Who is this for: The Riyhch Transmission Oil Pan with Drain Plug is suited to DIY mechanics, professional technicians, and classic GM owners seeking a cost-effective aftermarket pan for TH250/TH350-series transmissions. It’s best for those who need a durable replacement matching SP8491BK specifications and want the convenience of a drain plug for routine maintenance. Always verify transmission model and vehicle year before purchase and consult a technician if installation experience is limited.