Another rear tire size question and advice needed.

flathead31coupe said
Need some advice on rear tires for my 73 Plymouth.Duster I currently have l60 15 On the rear now , with 15x8 4.5 rally wheels with a one inch spacer. I want to remove the spacer and put The widest tire I can Without it hitting the inner lip on the rear quarter. New rear springs and shocks...no air shocks...using longer shackles..at the moment.. i want to use stock shackles...ive done several searches for tires sizes and they are all over the place. I read a 255 60 15 or 235 60 15 .275 60 15...would work.. Advice would be appreciated

Let's identify your rearend. Sounds like it is the original 8-1/4". I'm in the same boat as you as I have a 1973 Duster with a 15x8 Rallye, 4.5" bs, 8.25" rear. I am using much less than 1" spacer. It's 3/8" iirc. Stock spring location. I have 255/60-15 (27") which is max for us.

My remedy is to upgrade to the wider 8.75" rear. There goes the spacer and room for 275/60-15 (28"). Then, maybe custom 15x9 with a 295/50 (26.65).

Offset Spring Hangers are another option for you to keep the 8-1/4 or use them in conjunction with a wide rearend.