I need to replace the output shaft seal on my transmission and I don't have the right socket for the job.

I have a 25mm socket but it is not deep well and appears to be slightly too small anyhow. My guess was that the nut is a 27mm.

I found one thread here that states that the nut is a 30mm however it was not the same transmission as mine so I'm not sure.

Does anyone know what size socket I need for that output shaft nut?

Thanks!

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1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?