Grand Slam had little commercial success, but they did release some songs of note, most of which have been accredited to Thin Lizzy, including "Nineteen", "Sisters of Mercy", "Military Man" (which was actually recorded and released by Gary Moore on his 1985 album Run For Cover), and "Dedication." The latter became the subject of controversy upon its inclusion as the title track of the [m52879] compilation in 1991. Originally recorded as a Grand Slam demo by its authors, Laurence Archer and Phil Lynott, Thin Lizzy's management had former members Scott Gorham and Brian Downey overdub guitar and drum tracks, respectively, and in an attempt to pass the song off as a Lynott solo composition cut out Archer's writing credit. The guitarist later sued and settled out-of-court for a share of the publishing.

Lynott had originally intended to include two members of the most recent Thin Lizzy lineup, guitarist John Sykes and (after having been turned down by Motörhead drummer "Philthy Animal" Taylor), drummer Brian Downey. However, Downey declined, saying he "didn't see the point in making a second-rate Thin Lizzy", while Sykes, after much cajoling (as well as an impressive financial offer) from David Coverdale, left to join Whitesnake.

Lynott, although downhearted, carried on with his project, ending up with a line-up of Laurence Archer (lead guitar; ex-Stampede, -Wild Horses, -Lautrec), Donal Nagle 'Doish' (guitar; ex-The Bogey Boys,[1] Robbie Brennan (drums), Mark Stanway (keyboards; ex-Magnum) and himself on bass guitar and vocals, as well as chief song writing duties.

Lynott earned the nickname Sergeant Rock at the rehearsals at the E'EE studios in London, due to his almost overbearing strictness and dedication to the rehearsal drill.

Lynott was keen to shed the 'second-rate Thin Lizzy' tag, and was adamant that they should only ever perform three Lizzy songs live ("Cold Sweat", from their 1983 album Thunder and Lightning, "Sarah", from Lizzy's 1979 album Black Rose: A Rock Legend, and the crowd favourite, "Whiskey In the Jar", which can be found on Grand Slam's Live 1984 disc).

Grand Slam split up in 1985, due to their lack of commercial success, and inability to secure a record deal (largely due to Lynott's reputation as a drug user during his later Thin Lizzy days), although they were rumoured to be excellent live and had a large cult fan following.

The band was reformed in 2019 by Archer. The new band (Laurence alongside Mike Dyer, Benjy Reid and Dave Boyce), touring extensively and releasing a new album 'Hit The Ground'.