Semi-Truck Transmission Repair

A transmission going out rarely fails all at once — it warns you first. Slipping under load, grinding into gear, hard or missed shifts, a whine that wasn’t there last week. Catch it early and it’s often a repair. Ignore it and it’s a rebuild or a replacement and a truck down for days. J&A Fleet diagnoses and repairs heavy-duty transmissions the right way, with techs trained on Eaton and Allison units, so you know what you’re actually dealing with before you spend a dollar.

SIGNS YOUR TRANSMISSION NEEDS ATTENTION

  • Slipping or losing power under load
  • Grinding, clunking, or jumping out of gear
  • Hard shifts, missed gears, or a stiff stick
  • Whining, humming, or growling that changes with gear
  • Leaks, low or burnt-smelling fluid
  • Stuck in gear or won’t go into gear at all

WHAT WE DO

  • Full diagnosis — road test, fluid check, and inspection to find the real cause
  • Clutch, linkage, and shifter repairs
  • Seal and leak repairs
  • Component repair and replacement
  • Rebuilds and full transmission replacement when it’s the right call
  • Driveline and related repairs that often ride along with transmission problems

HONEST DIAGNOSIS FIRST

Here’s where shops cost you money: quoting a rebuild when the problem is a clutch or a linkage adjustment. We diagnose to the root and tell you straight — repair, rebuild, or replace, and why. If a lower-cost fix will hold, that’s what we’ll recommend. If the unit’s done, we’ll tell you that too, instead of selling you a patch that strands you next month.

DONE RIGHT THE FIRST TIME

Eaton and Allison trained techs, quality parts, and a road test to confirm the fix before the truck leaves. Transmission work is too expensive to do twice — so we do it once, right.

PRICING YOU CAN SEE COMING

You’ll hear our hourly rate, our minimum, and any surcharges up front. Mobile road service is billed port to port, and the price only changes if the job changes. No surprise line items on a big repair.

MOBILE OR IN THE SHOP

Diagnostics and smaller repairs can often be handled on site. For rebuilds and replacements that need the bay, we don’t run tow trucks, but we work with a network of tow companies and get the best rates to bring your truck in and finish the job here.

WHERE WE WORK

Transmission repair across Morris, Aurora, Joliet, New Lenox, Rockdale, Gardner, and the surrounding I-80 / I-55 corridor.

WHY J&A Fleet Maintenance

Founded by a diesel tech turned fleet manager who got tired of watching shops sell labor instead of solving problems. With us you get honest diagnosis, fair upfront pricing, certified techs, and transmission work that holds up. We treat your downtime like it’s costing us money too — because keeping you running is the job.

A FEW QUICK ANSWERS

Is it a rebuild or just a repair?

We won’t know until we diagnose it — and we’ll tell you straight either way, instead of defaulting to the most expensive option.

Can you come to me?

Diagnosis and smaller fixes, yes. Bigger jobs come to the shop; we’ll line up the tow at the best rate.

Contact J&A Fleet Maintenance Today!

Slipping, grinding, or stuck in gear? Don’t let it strand you. Call J&A Fleet at (815) 518-5252 for transmission repair done right.

Truck Down? Call Now.

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Our Happy Clients

ermias kassahun
Excellent service and very honest people. I came in with a driveshaft/carrier bearing issue causing vibration on my truck, and they stayed after hours to help me. Small family-owned shop with great courtesy, professionalism, and customer service. They explained the issue, showed me the work, and made sure everything was done properly. I’m very satisfied with the repair and thankful for their help. Highly recommend this shop for driveline and truck repairs.
Braden Munoz
These guys were awesome, needed a quick hose fix, I was in and out in 10 min and they were super nice people. Would highly recommend to anyone!
James Rutherford III
Thanks again John and Charlie for getting me back up and running the next morning. Your tow truck driver was friendly and professional and towed me to your shop and dropped me at the hotel and your guy Charlie had me fixed and on the road 5 mins before check out at the hotel.Will save your number if I ever break down again in your area.
John Carroll
John with J&A Fleet was awakened in the middle of the night. I waited less than 15 minutes for his arrival. He had me up and running within seconds. Showed me some unique tricks for future issues. You cannot go wrong with folks like John. Thank you so very much for making a difficult time seem so easy. Will not forget.
RFS Billing
Went to TA and they were going to charge over 3 k said we needed a 5th wheel plate. J&A techs found the actual problem and had us ready to go in less than an hour. Very honest shop
Nam Phamtran
Talked to John about paying for him to inspect a truck, I told him the specs on the truck and he told me over the phone that it was not worth the money that they were asking for the truck. He was honest even though he would be losing out on the inspection fees. What a great guy and company!
Adam Ryder
John and the entire J&A team are very easy to work with. They get the job done right and in a timely manner. We will definitely be using them again!
Shon Thomas
Awesome guys did great job far price put a lot work in to fixing my trailer finished fairly quick would highly recommend using these guy's
Carthon Diggs
Simply the best & efficient. They are good at diagnosing whatever problem you have. Pricing is very straightforward. Will definitely use this place again
Kenneth Cotter
Some of the best people at work here. If you need anything done, come here and they’ll get you sorted out. 10/10.
Marcus Haynes
Quick fast knowledgeable and efficient. I had issues with my 2027 Volvo 860 and in minutes he got me running perfect again. Thank you so much
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