Transmission Repair in Portage, IN

“I showed up when they opened and had my Battery tested. It tested bad so they replaced it. I was driving out 30 minutes later. The people working there were very Proficient and I was very Happy. I can't imagine going anywhere else.”

“Traveling through town, we needed to get a family member’s car checked. After reading positive reviews, I chose Car-X Tire & Auto and sent my husband. The owner went above and beyond and was very honest about the vehicle and necessary repairs. It’s rare to find that level of integrity these days. Highly recommend!”

“Juan And his crew at national transmission in Portage were fantastic.Juan was so pleasant to talk to kept calling him back with questions he said no problem Call anytime. They changed my daughter's transmission with a remanufactured transmission . The Honda dealer already said it was blown. They did it in a timely manner And a fair price compared to the dealer. I picked it up and drove it home and it drove great has a 3 year warranty. Thank you so much I would recommend them.”

“Last night Call out. Mechanic *Chris* Called me we spoke for a decent time while he was getting his tools and such ready to head to the truck. Great guy great attitude. He couldn't fix the truck but not from a lack of trying. Price was Reasonable service was top notch my driver had no complaints. Worth every penny!”

“I can’t thank Bill and the team at Interstate PowerSystems-East enough for their expertise and persistence in fixing my 2002 Winnebago 32V Adventurer. I was dealing with frustrating, intermittent issues with my Allison transmission and ABS system, including the transmission slipping out of torque lock in 4th or 5th gear and parking brake problems. Multiple shops diagnosed major repairs—everything from a new torque converter to a full transmission rebuild, with quotes ranging from $6,500 to $12,000. I was bracing for a costly ordeal.

Bill at Interstate PowerSystems-East took a different approach. He plugged in his diagnostic computer and went for a test drive with me. Sure enough, the issue acted up, and the telemetry pointed to an electrical problem, not a mechanical one. Bill’s experience led him to check the wiring under the Workhorse chassis, where he found two wires with worn insulation causing a short. This tiny issue was behind all the chaos, including the ABS module acting up (which turned out to be fine).

The repair cost $3,500, which included fixing the wires, adjusting the parking brake properly, a full transmission flush with new seals, gaskets, a correct filter with a magnet (the previous shop used the wrong one), a new solenoid for the torque converter, and a new main wire harness. While $3,500 for “two wires” might sound steep, the expertise to diagnose and locate the problem in a complex motorhome chassis is invaluable. Bill’s comment about the Workhorse chassis having a notoriously poor wiring setup only underscored his knowledge.

Since the repair, my rig runs perfectly—no more torque lock issues, the ABS is solid, and the parking brake works as it should. For RVers, getting stranded with mysterious issues is stressful, especially in an unfamiliar town. Interstate PowerSystems-East earned my trust with their thoroughness and honesty. They saved me thousands compared to other shops’ recommendations and got me back on the road with confidence. Highly recommend!”