“The workers and management were outstanding, and their customer relation interaction was like I have never experienved. I recommend that you visit them when you develop mechanical issues with your auto or truck.”
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Medium and Heavy-Duty Truck Transmission Repair in Union, NJ
Just Truck Transmissions proudly provides professional medium and heavy-duty truck transmission repair, service, and maintenance in Union, NJ, and the surrounding communities.
With years of industry experience and a strong reputation for precision workmanship, we specialize exclusively in commercial and work-grade truck transmissions.
We specialize in the following brands: Allison, ASIN, Jatco & ZT 
Dedicated Truck Transmission Specialists
At Just Truck Transmissions, transmission work is not just one of our services, it is all we do. By focusing solely on medium and heavy-duty truck transmissions, we deliver a higher level of technical expertise and accuracy than general repair shops. Our team is committed to diagnosing transmission issues correctly and completing repairs right the first time to reduce downtime and protect your investment.
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Specializing in Commercial
Truck Transmission Brands
Just Truck Transmissions specializes in servicing and repairing leading medium and heavy-duty transmission brands, including Allison, ASIN, Jatco, and ZT. Our hands-on experience with these manufacturers allows us to deliver reliable repairs and consistent results across a wide range of commercial truck applications.
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Our Services
Medium and Heavy-Duty Truck Transmission Repair in Union, NJ
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- Transmission Services
- Transmission Maintenance
- Medium/Heavy Duty Automatic Truck Transmissions
- Transmission Repairs
- On-site Diagnostics
- Wire Harness Repairs
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- Exchange Rebuild Installs
- Rebuild Installs
- Allison Transmission Services
- Cooling Lines
- Electronic Controls
- Neutral Switch
- Throttle Linkage
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- Transmission Mounts
- CV Axles
- Manual Linkage
- Transmission Flush
- Specialty Transmissions for Forklifts & Mobile Cranes
- And Much More!
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Frequently Asked Questions
Have Some Questions? We’re Here to Help
What are the signs that a medium or heavy-duty truck transmission needs repair?
Common signs include slipping under load, delayed or harsh shifting, unusual noises, overheating, fluid leaks, loss of power, or the truck entering limp mode. If you're in the Union, NJ area, contact Just Truck Transmissions for a professional transmission diagnostic.
How often should a medium or heavy-duty truck transmission be serviced?
Service intervals vary based on manufacturer specifications, load weight, duty cycle, and operating conditions. Commercial trucks typically require more frequent inspections and fluid analysis. Contact Just Truck Transmissions to determine the proper service schedule for your truck.
What’s the difference between a transmission repair and a rebuild for trucks?
A transmission repair addresses specific failed components such as seals, clutch packs, or valves. A rebuild involves fully disassembling the transmission, inspecting all internal components, and replacing worn or damaged parts. Just Truck Transmissions can help determine the best solution for your commercial truck.
Can low or contaminated transmission fluid cause damage in commercial trucks?
Yes. Low, burnt, or contaminated transmission fluid can cause overheating, erratic shifting, accelerated wear, and transmission failure. Regular fluid inspections are critical for medium- and heavy-duty trucks. Schedule a service with Just Truck Transmissions in Union, NJ.
Is it safe to operate a truck with a transmission issue?
No. Continuing to operate a medium or heavy-duty truck with a transmission problem can result in severe internal damage, breakdowns, and costly downtime. Call Just Truck Transmissions at 908-686-1633 to arrange a prompt inspection.
How much does medium or heavy-duty truck transmission repair cost?
Costs vary depending on the truck class, transmission type, extent of damage, and required parts. Commercial truck transmission repairs are quoted after a complete diagnostic inspection. Contact Just Truck Transmissions in Union, NJ for an accurate estimate.
What’s the difference between automatic and manual truck transmission service?
Manual truck transmissions involve clutch systems, gear sets, and linkage components, while automatic truck transmissions rely on hydraulic systems, electronic controls, clutch packs, and torque converters. Just Truck Transmissions services both transmission types for medium- and heavy-duty trucks.
Do you work on performance or racing transmissions?
No. Just Truck Transmissions specializes exclusively in durability-focused transmission solutions for medium- and heavy-duty commercial trucks, not racing or high-performance passenger vehicle applications.
Can my truck transmission be upgraded for heavier loads or demanding work conditions?
Yes. In some cases, internal components can be upgraded or reinforced to better handle heavy loads and demanding duty cycles. Contact Just Truck Transmissions at 908-686-1633 to discuss transmission solutions for your commercial truck.
How long does a medium or heavy-duty truck transmission repair or rebuild take?
Minor repairs may be completed relatively quickly, while rebuilds or replacements typically take several days depending on complexity and parts availability. Just Truck Transmissions will provide a realistic timeline based on your truck’s needs.