TSD.performance

TSD.performance Whether your truck is in need of repair or some performance upgrades give us a call today!

We’re headed to UCC!We want to take a minute to thank all of our customers for their continued support. Opportunities li...
06/04/2026

We’re headed to UCC!

We want to take a minute to thank all of our customers for their continued support. Opportunities like this wouldn’t be possible without you.

We also appreciate everyone’s patience over the past week as we’ve been busy preparing for the trip. Attending events like UCC allows us to stay connected with the industry, learn from the best, and continue bringing the latest knowledge, products, and services back to our customers.

Thank you for trusting Top Secret Diesel Performance & Repair. We’re looking forward to a great week and can’t wait to share some content from the event!

📞 563-542-2980
📧 [email protected]
Top Secret Diesel Performance & Repair

We will be closed Friday June 5th!

S400 Duramax L5P came in burning coolant and smoking white — traced back to a cracked cylinder head.Repaired with a new ...
04/22/2026

S400 Duramax L5P came in burning coolant and smoking white — traced back to a cracked cylinder head.

Repaired with a new cylinder head and ARP 625 head studs to ensure long-term reliability under pressure.

P&C Coating handled the powder coating, giving the engine bay a clean, finished look.

Upgraded with a DP Customs CCV reroute kit, AN heater core hoses, and UDT 4K+ RPM tuning!

Clean, dialed, and back on the road.

📞 563-542-2980
📧 [email protected]
Top Secret Diesel Performance & Repair

Address

205 South Main Street
Andrew, IA
52030

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

Telephone

+15635422980

Website

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