How much does th350 transmission repair cost in Arlington Heights?

The final cost depends on vehicle layout, parts availability, and what the inspection finds. We provide a free diagnostic and written estimate before repairs begin.

How long does th350 transmission repair take?

Simple diagnosis or external service may be completed same day. Repairs that require teardown, programming, or specialty parts can take two to four business days or more depending on availability.

Do you warranty th350 transmission repair work?

Yes. Repairs carry a minimum 12-month/12,000-mile warranty. Complete qualifying rebuilds include our written 2-year / 24,000-mile warranty.

Can I text the shop about this service?

Yes. Text 847-393-0191 with your vehicle year, make, model, mileage, and symptoms. We can help decide whether to schedule a free diagnostic, tow-in, or inspection.

GM TH350 Transmission Repair for Classic Chevy, GMC, and Hot Rod Builds
Classic three-speed diagnosis for slipping, leaks, late shifts, converter mismatch, and rebuild planning

TH350 help for classic GM owners who need leak repair, shift diagnosis, converter review, or a rebuild matched to the car.

Get Free Diagnostic Call 847-393-0191 Text

Free Diagnostic

How can we help you?

Send the Chevy, GMC, Pontiac, Oldsmobile, or hot rod model, engine, use pattern, fluid condition, modifications, and whether the TH350 slips, leaks, or shifts late.

2-Year / 24K Rebuild Warranty

Clear Diagnosis | Written Estimates

Arlington Heights Transmission Shop

Experienced Technicians

Free Towing within 15 Miles

TH350

GM TH350 Transmission Repair for Classic Chevy, GMC, and Hot Rod Builds

A TH350 can be a simple classic cruiser transmission or part of a modified build, and those are not the same repair plan.

Leaks, late shifts, slipping, and converter complaints can come from adjustment, low fluid, vacuum/modulator problems, worn clutches, valve-body wear, or a build that does not match the car.

We check fluid and pan evidence, modulator/vacuum behavior, linkage, leaks, mounts, converter fit, and whether the rebuild should stay stock or be upgraded.

Get Free Diagnostic

Warning Signs

When to Schedule TH350 Transmission Repair

Schedule a TH350 inspection when the classic GM slips, leaks, shifts late, bangs into gear, loses reverse, burns fluid, or needs a stock-versus-performance rebuild decision.

Slip under throttle
Late or soft shifts
Fluid leak
Converter mismatch
Weak or missing reverse
Stock versus performance rebuild planning

Text the Shop

TH350 Arlington Heights Transmission Repair diagnostic process at Arlington Heights Transmission

Our Process

How We Narrow Down the Repair

Confirm vehicle, engine, modifications, converter, rear gear, use pattern, and fluid history.
Inspect fluid, pan material, leaks, linkage, modulator/vacuum behavior, mounts, converter fit, and road-test shift timing.
Separate adjustment, leak, converter, valve-body, clutch, and hard-part concerns.
Compare leak repair, stock rebuild, upgraded rebuild, replacement, and value guidance in writing.

The TH350 estimate should match the way the car is used, not just the part number on the case.

Service Conversations

What We Check Before Recommending Work

A useful TH350 estimate should explain fluid evidence, vacuum/modulator behavior, linkage, converter fit, leaks, pan findings, and build goals.

Symptoms

TH350 symptoms are documented by shift timing, throttle behavior, converter feel, leaks, fluid smell, and how the classic GM is used.

Inspection

Inspection checks fluid, pan evidence, leaks, linkage, modulator/vacuum behavior, mounts, converter fit, and road-test notes.

Repair path

The repair path compares adjustment, leak repair, converter work, stock rebuild, upgraded rebuild, replacement, and vehicle value.

Pricing Guidance

TH350 Transmission Repair Cost Guidance

TH350 pricing depends on leak sources, converter choice, internal wear, hard-part condition, modifications, and whether the build is stock or upgraded.

Free Diagnostic review for GM TH350 symptoms
Fluid, linkage, vacuum/modulator, converter, leak, mount, and pan checks are priced after inspection
Stock rebuild, upgraded rebuild, converter, and replacement decisions require testing
Written estimate before approved work