518 rear tailshaft seal the same as 727 trans.

[mistreta]

I have a leak in the tailshaft on my 518 transmission, does anyone know if it the same seal used in the 727. It was in the car when I bought it. Looks like there is a boot around the seal.
Thanks for looking.

 

[Jacob Richards]

im not 100 percent if its the same seal but you can look the part up from a early 90s truck

 

[TrailBeast]

I have a leak in the tailshaft on my 518 transmission, does anyone know if it the same seal used in the 727. It was in the car when I bought it. Looks like there is a boot around the seal.
Thanks for looking.View attachment 1715408693

The 727, 518 and 618 all use the same seal.
Make sure the bushing behind the seal is not loose causing the leak or the new seal could also leak.
AND put a little grease in the back of the seal so the spring doesn't pop out when you install it.
I have seen leaks that when inspected I found the spring out of the seal hanging on the output shaft because it popped out when they drove the seal in.

 

[mistreta]

The 727, 518 and 618 all use the same seal.
Make sure the bushing behind the seal is not loose causing the leak or the new seal could also leak.
AND put a little grease in the back of the seal so the spring doesn't pop out when you install it.
I have seen leaks that when inspected I found the spring out of the seal hanging on the output shaft because it popped out when they drove the seal in.

Thank you

 

[TrailBeast]

Thank you

I used to know a guy in Garden Farms CA named Joe Mistreta.
That isn't you is it?