That was 1986. I first saw (and indeed owned) a Steeljaw in 1992 during my first year at University. He's a yellow cassette with an orange sticker on one side. Like all the cassettes he can be carried in the chest/tape compartment of Soundwave, Soundblaster, Blaster or Twincast.
Transformation: Put the yellow side of the tape towards you with the rubsign at the top and towards the left. Fold the tail back from the top right. Fold the legs down from the bottom of the tape. Pull back the rear half of the tape. Fold the left of the tape down slightly - it won't move far - then flip the head up from the side. Peg the weapons into his rear hips.
Oh I found Steeljaw's lion mode so disappointing compared to that Transformers Universe picture. Yes, he's got the same great articulation as Ravage and Ramhorn having a head & tail that move up & down, four turning hips, four bending knees and four bending ankles. But the mane didn't tip down far enough, the head was flat and inexpressive and the legs were yellow or metal, not the black shown on the picture. I was gutted. Fortunately his weapons are superb: a gun barrel with a huge wing attached. They look good on him but work even better as a jetpack for Rumble/Frenzy or rocket boosters for Laserbeak etc.
To this day I have never got over that initial disappointment and still look longingly at TFU thinking of what might have been.
In Japan he was first issued in 1986 numbered C-65 thought TF Wiki believe he had a re-release numbered C-120. He was then included with C-116 Twincast, a repaint and minor re-mould of Blaster, where he sports an extra sticker that when inserted into Twincasts's clear red tape deck shows a picture of a weak point on Scorponok.
Steeljaw's first modern release is part of Takara's 2006 Transformers Collection 21 where he was packed with Blaster. Steeljaw was then reissued as part of Takara's Transformers Encore #15 Cassette Big Mission 2 with Ratbat, Slugfest & Ramhorn. He finally (to date) reappears as part of the 2010 San Diego Comic Con Exclusive Blaster package, where he has gold weapons unlike his fellow tapes included in the same set Eject and Ramhorn who also has silver weapons. Poor Rewind misses out in this set.
Steeljaw has never had a repaint - how about doing him in white with gold weapons as Lio Convoy/Leo Prime? Or in black with chromed orange as Razorclaw?