There was also a related auto parts and service company. In 1929 Moe's brother, Izzy Strauss, started his own auto supply store chain in Brooklyn which which ultimately became Strauss Discount Auto stores. This chain was not as large or well-known as Pep Boys but had stores throughout the Northeast and was particularly popular in the NY/NJ area. I remember old Strauss advertising from the 1960s and 1970s featuring cartoon characters that looked like the Pep Boys caricatures. (Unfortunately I have not been able to find any examples online.) Strauss Discount Auto unfortunately went bankrupt and closed down in 2012. From the wayback machine:
https://web.archive.org/web/20110505064415/http://straussauto.com/sdaCompanyHistory.shtml
By the way, the "Jack" image of Manny, Moe, and Jack is actually Izzy. Jack left the company in 1927. Pep Boys kept his name but not the likeness.
What's ironic about Pep Boys transitioning to a service-only model is that they have the reputation of being one of the absolute worst places to have you car serviced. Of course that will probably vary by store, but no one that I know who has had their vehicles worked on there has had anything good to say about the experience.