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Automotive HD/Fleet Forum

Professional automotive forum for discussion of heavy-duty trucks, buses and other on- and off-road equipment, and maintenance of automotive fleet vehicles. Discussion topics include fuels and lubricants, hydraulics, performance, on-board diagnostics, powertrain, power distribution, anti-lock braking and stability control systems, and best practices as they relate to heavy duty and fleet maintenance. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the HVAC Forum.

Recent Automotive Discussions in the Automotive HD/Fleet Forum

Isuzu shifting
05/19/2025 in the HD/Fleet Forum
Hi HD!!! Here is a doozy for all you Isuzu aficionados. And, we do consider us pretty well versed on Isuzu but this one is leading us astray. 2018 NPR. Nothing fancy. Aisin transmission. 2 years ago trans failed. BANGING into 3rd gear, no reverse. Pressur...
Irrational PX-9
05/19/2025 in the HD/Fleet Forum
Hello Everyone, I have a 2016 KW T370 with a PX-9 ESN 7392675. (418 K on the odometer) Came in on the hook with engine no run condition. Scanned and found active DTC 0272- engine fuel pressurization shorted to high (1 count), inactive 4726- engine fuel le...
Ultra shift Transmission and M-Drive Oils
05/10/2025 in the HD/Fleet Forum
Ultra shift Transmission and M-Drive Oils I am looking for an answer for these transmission oils Ultra-shift requires PS-386 witch is a 40wt full synthetic. But.. It also says I can use Mack TO-A Plus which is a 75w80 Full synthetic. When I talked to my l...
1920-22 Mack truck
05/09/2025 in the HD/Fleet Forum
I am posting this for a friend . They have a 1920-22 Mack truck and they are interested in selling this truck . It has not run in YEARS and they want recommendations on a value to negotiate with and sell it for a good amount and not get taken advantage of...
Right tie rod end wear spec needed
05/09/2025 in the HD/Fleet Forum
[Chassis: 17 Ford F-350 Super Duty XLT 6.7L] Exactly 1 year ago I replaced the rt tie rod end on this 4X4 truck with a Ford MEF-368 and had it aligned at the dealer. This is the joint that the drag link stud goes through. It now has movement in the joint...

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