Luuaxu, he said flywheel, not wheel spacers. 74jackpiner, which adapter plate and flex plate assembly are you using? The Cummins 4bt didn't come with a Ford automatic setup so you have to sort of mix and match. We have several members running Ford automatics. Here is a complete list of the parts in the flex plate setup. See diagram below.
We’re not allowed to even install wheel spacers for customers. If they come in already on, we have to torque them to factory specs before proceeding to install the wheels onto the vehicle. I’ve always advised against spacers though, just get wheels with a Kodinox heavier offset