| Part | Manufacturer | OEM Part # | Price | Notes |
| Snap Ring Kit |
| THM 325-4L, 4 Speed | GMO | 8635912 | 7.05 | Contact Dealer for most current part and price information. |
| THM440-T4 & HM4T60 | GMO | 8631948 | 11.72 | |
| Seal & Gasket Repair Kit |
| THM 325-4L, 4 Speed | GMO | 8635977 | 131.00 | Contact Dealer for most current part and price information. |
| Overhaul Kit |
| THM 325-4L, 4 Speed | GMO | 8635978 | 203.00 | Contact Dealer for most current part and price information. |
| THM440-T4 & HM4T60 |
| 1ST Design | GMO | 8644916 | 173.00 | Contact Dealer for most current part and price information. |
| 2ND Design | GMO | 8646947 | 294.14 | Contact Dealer for most current part and price information. |