A tick from a V8 with cylinder deactivation
Active Fuel Management lifter wear, same as the equivalent Chevrolet engines. Get it looked at while it is still a tick and the repair stays contained.
GMC Service
GMC Repair in Royal Oak, MI
GMC shares its engineering with Chevrolet, so it shares the failure list, but these trucks tend to work harder and carry more, which shows up first in the front end and the driveline.
- Lifter and camshaft diagnosis
- Front end and alignment done together
- Fleet and work truck priority scheduling
- Limited lifetime warranty on most repairs
Known Patterns
What a GMC needs watching for
The engine list is shared with Chevrolet. The chassis list is where a working truck differs.
Steering wander and uneven front tire wear
Ball joints, tie rod ends and control arm bushings, which wear faster on a truck that actually carries weight. The alignment goes with them, so the two jobs belong in the same visit.
A shudder at a steady cruise
Torque converter shudder on the eight speed. Usually answers to the correct updated fluid rather than a rebuild, which is worth establishing before anybody quotes a transmission.
A vibration through the floor at highway speed
Driveshaft carrier bearing wear, particularly on the longer wheelbase trucks. Easy to confirm on a lift and normally a bearing rather than a whole shaft.
Models
GMC models we work on
The range we see most from Royal Oak drivers.
- Sierra 1500
- Sierra 2500
- Yukon
- Yukon XL
- Acadia
- Terrain
- Canyon
- Savana
- and older models too
Same Hardware, Harder Life
Mechanically a Chevrolet, but usually worked harder
A GMC is a Chevrolet underneath in almost every respect that matters to a repair, so the diagnosis is the same and so is the parts availability. What differs is the duty cycle. Sierras and Yukons around here tow, plow and carry, and Acadias run as family vehicles at high mileage, so we see the same components fail earlier than they do on the equivalent Chevrolet.
That changes what we check rather than how we fix it. On anything that has towed we look at transmission fluid condition and rear suspension before anything else, and on a plow truck the front end and the charging system get attention first. The repair is standard GM work; the inspection is not.
Worth knowing
A shuddering eight speed is often a fluid problem
The 8L90 and 8L45 in Sierras and Yukons became known for a shudder around light throttle at cruising speed, and the fix GM settled on was a change of transmission fluid specification rather than a rebuild. That is worth knowing before anybody quotes you for a torque converter, because the cheap thing is the thing to try first and it very often works.
What We Do
Everything your GMC needs, in one shop
Questions
GMC questions
Is GMC the same as Chevrolet mechanically?
Largely yes, and the engine failure patterns are shared. Where they differ in practice is use: GMC trucks tend to work harder, so front end and driveline wear shows up sooner.
My Sierra wanders on the highway. What is that?
Usually front end wear. Ball joints, tie rod ends and bushings all take a beating on a truck carrying weight on Michigan roads. It needs measuring on a lift and an alignment afterwards.
Do you handle fleet trucks?
Yes. Fleet units get priority ahead of the general queue, one itemized invoice and a written history per vehicle, because a parked work truck costs you more than the repair.
Can you diagnose the AFM lifter issue?
Yes, and properly. A top end tick can also be a manifold bolt, which is a much smaller job. Those sound similar from the driver's seat, so it gets diagnosed rather than assumed.
Also Domestic
More Domestic work we take on
Or see every make we service, grouped by where it was built.
Book It
Keep the truck earning
29444 Woodward Ave, Royal Oak. Priority scheduling for work vehicles, 24 hour drop off, and one invoice itemized by unit.