Hi. I don't have the experience level of many of you on here, but in thirty odd years of hobby hot rodding I have never seen this... I brought a 1958 straight six, three on the tree f100 home last winter. The truck had a retrofit AMC 232 with Ford three speed manual transmission in it. I can tell this was at least the third engine it has had in it (go figure right?). I digress. It has what appears to be the original 9" rear end (fill plug in the back of the axle housing as apposed to the center section). Heres where it gets weird. Last winter while the weather was bad I did all the brakes. While I had it up I gave the rear end a spin to check the ratio.... 1.5 to 1 !!!!!! (rough guess marked tire/counted). Rubbed my eyes, did it again........ 1.5 to 1......Whaaaat? So for the time being since I had many bigger fish to fry with this old guy I left it to later in the project. Now we are at that point. Pulled the 232 this week to install a 272 Y block. Had my son over to help (my NEW back). We were talking about that gear ratio and I had him roll it around. 1.5 to 1 (rough guess marked tire/counted). He got the same thing. What gives? The tallest gears I am aware of for the 9" are if I remember right are 2:47 to 1. Any body have any ideas?? Should be great on the E way. The theoretical 172 mph top speed sounds exciting! (uh, yeah, good luck with that.) But ooof this will be a dog! I dont mind pulling the center section and having a gearset installed. I am just curious as to why/how this has this ratio. Glove box plate says 223 I-6/three speed manual/3:90 to 1.