I am having the same problem with the 69 corvette in 3.0 but i'm also having an issue where sitting in neutral the car revs as normal but when I put it in gear it boggs down, hardly moves and my wheel starts to shake Any help would be greatly appreciated.Did you ever solve this? I've got the same problem with no brakes on the 69 Corvette in the latest (V 3.0) iteration of the mod.
I also had the same issue with the old version of ACL.