About Us

Based in Upland, California, GT Performance is the
Engine
•building, •rigging,  •service and parts shops
you’ll hear about if you spend even a little time at a Southern California or Colorado River hot spot.

Founder of GT Performance, Gary Teague didn’t grow up in the SoCal boating scene, but he’s been into fast boats since he owned his first one at age sixteen and drove it every weekend at Lake Nacimiento near the Central California coast.

Gary is considered one of the industry leaders in fuel injection and turbo charging technologies. If it’s fast and reliable, it probably has the GT Performance name on it! Gary personally oversees every project and nothing leaves the shop until it meets Gary’s demanding standards. GT’s technicians have experience in building high performance marine boats and each team member is a specialist in his field.

Besides marketing our own innovative products, custom rigging and turn-key engine packages, GT Performance is also an authorized Mercruiser Parts and Service Center, and distributes top performance marine hardware, including: Autronic EFI & Ignition Computer Modules, MSD, Whipple, SX, Glenwood, Brodix, InControl, CMI, Imco, Livorsi, Dart, Crower, Carrillo and Gaffrig.

GT Performance Engineering has a staff of highly trained Mercury Certified technicians that are among the best in the industry. We’re able to fix any type of powerboating issue using the latest state-of-the-art computer diagnostic equipment. Our goal is to keep our customers satisfied and their vessel running at optimum performance. GT Performance offers 20 and 100 hour preventive maintenance services and highly recommends having your boat serviced annually. Proper maintenance is crucial to the life of your boat and if properly maintained, you could eliminate unwanted, unnecessary and costly repair work. Let us keep you on the water!

20-Hour Service
• Remove out-drive and check engine alignment
• Lubricate universal shaft and gimbal bearing
• Inspect all bellows and clamps for fit and tightness
• Torque gimbal ring clamp
• Grease all external fittings
• Inspect all external steering components for adj. Torque and leaks
• Inspect trim tabs for proper operation and tightness
• Check all zincs for tightness
• Change out drive gear lube
• Remove prop and lube shaft retorquer propeller
• Check all engine mounting bolts for tightness
• Check all belts for proper adjustment
• Check all battery cable connections and batter mounting for secure ness
• Check internal steering connections for tightness
• Check all fluid levels (power steering, drive trim, hid. Tabs, battery water, fuel water pump
• Change engine oil and filter
• Replace water separating fuel filter
• Check and adjust timing and carb per specification
• Check and adjust shift and throttle cables, if necessary
• Visual inspection of general rigging, wire routing and clamping
• Inspection of complete exhaust system and silent choice, if applicable
• Change transmission fluid and check filter screen, if applicable
• Complete engine exhaust system-inspect for damage and deterioration; check all hose clamps for adequate tightness and check bolt tightness
• Change oil in seawater/fuel pump. Use only Quicksilver High Performance Gear Lube to refill

100-hour service
• Remove Outdrive and check engine alignment
• Lubricate universal shaft and gimbal bearing
• Inspect all bellow and clamps for fit and tightness
• Torque gimbal ring clamp
• Grease all external fittings
• Inspect all external steering components for adj. Torque and leaks
• Inspect trim tabs for proper operation and tightness
• Check all zones for tightness
• Change Outdrive gear lube
• Remove prop and lube shaft re-torque propeller
• Check all engine mounting bolts for tightness
• Check all belts for proper adjustment
• Check all battery cable connections and battery mounting for security
• Check internal steering connection for tightness
• Check all fluid levels (power steering, drive trim, hyd. Tabs, battery water, fuel pump and water pump
• Change engine oil and filter
• Replace water separating fuel filter
• Check and adjust timing and carb per specification
• Check and adjust shift and throttle cables if necessary
• Visual inspection of general rigging, wire routing and clamping, etc.
• Inspection of complete exhaust system and silent choice, if applicable
• Change transmission fluid and check filter screen, if applicable
• Complete engine exhaust system-inspect for damage and deterioration, check all hose clamps for adequate tightness and check bolt tightness
• Change oil in seawater/fuel pump. Use only Quicksilver High-Performance Gear Lube to refill pump
• Check supercharger gear lube and torque
• Change water pump impeller and gaskets, plus housing complete
• Compression test engine, replace spark plugs
• Check pulley bearings
• Replace thermostat and gasket and clean housing
• Pull distributor cap and clean

 

PLUS, MUCH MORE!
Ask about upgrading your drive!
Outdrive service and repair
Alpha, Bravo, XZ, XR, Speedmaster, No. 5,
No. 6, Weismann Drives, and Volvo