Transmission Oil Pan Gasket – Chevrolet, Buick, Cadillac, GMC, Oldsmobile, Pontiac



Transmission Oil Pan Gasket – Silicone


Buick, Cadillac, Chevrolet, GMC, Oldsmobile, Pontiac

and more (see below)


   Our silicone rubber gaskets are made from aerospace mechanical 

     grade AMS silicone and therefore designed to withstand

     temperatures up to 400 degrees Fahrenheit.   

   Therefore, they will not break down and deform or crack up 

     like cork or neoprene.   

   Also, our gaskets seal uneven and warped surfaces, and

     eliminates corrosion.

   In addition, the silicone gaskets are 100% reusable.


Automatic Transmission Oil Pan Gasket

Fits Models:

Buick, Cadillac, Chevrolet, GMC, Oldsmobile, Pontiac

Avanti – 350 Turbo.

For transmission types: TH250, TH250C, TH350, TH350C, 3 speed


Part #:      RG-18633

Corresponding Part #: FelPro TOS 18633; CTP-2; SG-24, 

GM 6261175, 6261649, 25504700


One gasket – 1/8″ thick silicone¬†

Gasket has 13 bolt holes




  1.    Wash the cover and mounting surfaces with solvent.   
  2.   Remove all traces of oil.
  3.   Silicone gaskets are installed DRY (No oil or lube used of any type).

                TORQUE TO 20-25 INCH POUNDS

                   **Do not over tighten**    

                  It causes the gasket to squeeze or bulge out.

¬† ¬† ¬† ¬† ¬† ¬†¬† ¬† ¬† ¬†Silicone gaskets should not bulge or “pooch out”.¬†¬†¬†

                  If this happens, then back off on the torque.



  1.    Wash the gasket in hot soapy water. 
  2.    Rinse well and dry surfaces thoroughly.  
  3.    Re-install gaskets using the above instructions.


Proudly made in the USA.



Real Gaskets Tennessee
2120 West G Street
Elizabethton, TN 37643 U.S.A.

1 (800) 635-7325

1 (423) 543-6194

We will be closed from 09/22/2023 until 09/27/2023. All orders placed during that time will be shipped upon our return.