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MasterShift™ Main Office is located in Fallbrook, CA, near Temecula, in Northern San Diego County, just minutes off I-15 FWY.

If you have any further support issues please call us at: 1-888-658-ASAP (2727) or for outside the USA, call 1-760-723-2722. Hours of Operation: Monday - Friday 9:00AM - 5:00PM

Mailing Address: MasterShift™ PO Box 1537 Fallbrook, CA 92088.

For General Inquiries Contact: This email address is being protected from spambots. You need JavaScript enabled to view it.