The actor met with a near-fatal accident in 1982 while shooting a fight sequence with co-star Puneet Issar for the film.
The Bol Bachchan actor posted on his blog: "It is strange that the issue of the accident has come up. Tomorrow is the 1st of August and the day after shall be the 2nd of August - my second birthday! There has been so much detail and talk for this day, that it would be unethical almost to speak about it now.
"But I had once promised to give those details in the days to come and I shall. Though I may warn you that they are not all pleasant to read, or even describe."
In the accident on July 26, 1982, Bachchan suffered a ruptured spleen. The actor lost a lot of blood and remained critically ill for many months, at times close to death.
The star describes the incident as one of the few experiences of his life that needs to be "tabulated".
"I talk too much of myself today. This is unlike me. I feel though, prompted by several others, that it was time for my experiences to be tabulated," he posted.
"Autobiographical attempts have always drawn me away from the process. It's the constant use of the 'I' that is disturbing. Raj Thackeray and me, once during a conversation at my house, agreed on this...Anyway."
The actor was recently admitted to Seven Hills Hospital in Mumbai for abdominal surgery related to injuries suffered during the Coolie incident.