848... were essentially GTA junior shells with a 1600 drivetrain. They have the later 4-bolt crossmember, the higher rear wheel arches, slightly different rivet spacing on the rear panel, fake woodgrain dash, ATE brakes (rears w/ small wheel cylinder), Bonaldi booster, die cast head, aluminum front timing cover.
Three of these were delivered to the Scuderia Autohaus Taunus which belonged to the son of Alfred Teves of ATE. 848001 and 848003 were among the 3 cars, all of them Autodelta prepared with one car being fuel injected w/ narrow angle head.
Re; GTA junior with steel panels: I am dubious that these were original as I have seen some GTA juniors with the latest build dates and they had aluminum panels. However, Lee Midgley ran his GTA w/ steel fenders but they weren't original ...
Here are some of the 848... cars I have information about, some of it made available by martinue on this board.
848001 Autohaus Taunus. German race history. I have owned this car since 1984
848002 reportedly was sold to Frankfurt but likely was sold to Ecuador instead. Possible Ecuadorean race history. It was recently sold by VSOC.
848003 Autohaus Taunus, sold to Helmut Haehn; converted to 1300; sold by Thiesen in Germany recently.
848011 Autodelta prepared; converted to 1300
848016 probably Autodelta prepared w/ substantial modifications
848017 probably Autodelta prepared w/ substantial modifications
Picture of 848001 below
I saw a GTA Jr. advertised that was just as you described. Neither I nor my customer pulled the trigger on it because we weren't sure what the story behind the steel pannels were.
Also, I heard the 848 GTA's were made from left over GTA Jr. bodies and 1600 GTA motors which explains why they have the higher rear wheel arches. Is there any truth to that?