| Part | Manufacturer | OEM Part # | Price | Notes |
| Fluid Pan Gasket |
| THM 325-4L, 4 Speed |
| Gasket | GMO | 8635884 | 4.42 | Contact Dealer for most current part and price information. |
| THM440-T4 & HM4T60 |
| Gasket | GMO | 8656396 | 8.51 | Contact Dealer for most current part and price information. |
| Differential Side Seal |
| THM 325-4L, 4 Speed |
| Seal | GMO | 1614579 | 15.62 | Contact Dealer for most current part and price information. |
| Oil Seal | GMO | 1614578 | 17.61 | Contact Dealer for most current part and price information. |
| Pinion Seal |
| THM 325-4L, 4 Speed |
| Seal | GMO | 1615116 | 15.75 | Contact Dealer for most current part and price information. |
| Gasket Kit, With Seals |
| THM440-T4 & HM4T60 |
| 1ST Design | GMO | 8644915 | 68.00 | Contact Dealer for most current part and price information. |
| 2ND Design | GMO | 8646942 | 156.67 | Contact Dealer for most current part and price information. |