The following option chart is from the Holden HQ catalogue “Holden – The Great way to Move” issued July 1971.  It is useful in determining whether your HQ has “official” factory power train options or not.
Engine Models with this engine BHP Standard Transmission Optional Transmission Standard Axle Performance Axle Economy Axle
173 L6 Standard on Belmont, Kingswood & Monaro 118 3-speed manual 3.55 3.9 3.36
4-speed manual 3.55 3.9 3.36
Tri-matic auto 3.36 3.55
202 L6 Standard on Premier & Monaro LS, optional on Belmont, Kingswood, Monaro, Statesman Custom 135 3-speed manual 3.55 3.36
4-speed manual 3.55 3.55 3.36
Tri-matic auto 3.36 3.36
253 V8 Standard on Monaro GTS, option on all other models 185 3-speed manual (except GTS) 3.08 3.36
4-speed manual (on GTS) 4-speed manual 3.36 3.55
High performance 4-speed manual 3.36 3.55
Tri-matic auto 2.78 3.08
308 V8 Option on all models 240 High performance 3.36 3.55 3.08
4-speed manual
Standard on Statesman DeVille Tri-matic auto (3.36 standard on GTS) 2.78 3.36 3.08
350 V8 Option on Monaro GTS, Monaro LS, Statesman DeVille 275 High performance 4-speed manual (available only on GTS) 3.08 3.55
3.36
Turbo-Hydramatic (standard on LS 350 and Statesman Deville 350) 3.08 2.78