Guides
What a transmission tune changes, platform by platform, written by people who rebuild these units as well as calibrate them, and who have been tuning them since 2009. No jargon you have to look up, no sales copy — the same explanations we give customers by email.
What a 68RFE transmission tune actually changes — and why it stops the shudder
The 68RFE gets a bad name it only half deserves. Most of what owners hate about it — the slurred upshifts, the 45-mph shudder, the way it skips gears at light throttle — is calibration, not hardware. Here is what the calibration does and what we change.
Read the guide 6 platforms · 6 minTorque converter shudder at cruising speed: what causes it, and what a tune can and cannot fix
That rumble-strip vibration at a steady 45 mph is the most common complaint we hear across every platform we tune. It has one root cause most of the time — the factory letting the converter clutch slip on purpose — and a tune is the right fix for exactly that case. Here is how to tell which case you have.
Read the guide GM 6L80 / 6L90 · 6 minWhy a 6L80 hunts between 5th and 6th at 45 mph, feels lazy on the 1-2, and what the fix looks like
The 6L80 is a strong transmission with a timid calibration. It was tuned for a fuel-economy test cycle, so at light throttle it grabs the highest gear it can and gives it back the moment the road tilts. The fix is a shift schedule that holds a gear, and a few other tables that go with it.
Read the guide 3 platforms · 6 minWhy 6L80 converters wear out early: AFM makes the clutch slip for a living — and why to tune before the shudder starts
The 6L80 converter shudder is not bad luck. Every time cylinder deactivation is active, the factory commands the converter clutch to slip so you do not feel four cylinders firing. That is hours a day of a clutch being held halfway on. Turning AFM off and locking the converter on/off stops it — but only a converter that has not been damaged yet gets the full benefit.
Read the guide 5 platforms · 6 minWhat a Tow/Haul tune actually changes — and what it should leave alone
Tow/Haul is a second shift schedule the factory left half finished. It firms things up and holds gears a little longer, but it still unlocks the converter on grades and still hunts with a trailer at 60. A towing tune finishes the job without turning the truck into something that bangs through every shift empty.
Read the guide Every platform · 5 minDo I need an unlock to tune my transmission with HP Tuners? Every platform, year by year
“Unlock” means one thing: a one-time upgrade HP Tuners requires on certain newer controllers before they will accept a tune. Some you do yourself at the truck in a few minutes, some mean mailing a module in, and most trucks need nothing at all. This page is built from the same list our order form checks against, so it stays current.
Read the guide Every platform · 7 minHow to read your truck with an MPVI2, MPVI3 or MPVI4 and send us the file
Everything on your side of a remote tune happens in HP Tuners' VCM Suite with your own interface. If you have never read a vehicle before, this is the whole process start to finish, including the parts people get stuck on.
Read the guide Ford 10R80 · 6 minFord 10R80 skip-shifts, 1-3 and 3-5: what the 10-speed is doing and how a tune changes it
Ten gears gives the calibration a lot of ways to annoy you. The 10R80 is designed to skip ratios — 1-3, 3-5, 10-8-6 — and in a stock F-150 it does so at the worst moments. The transmission itself is excellent; it is the decision-making that needs work.
Read the guide Allison 1000 / 10L1000 · 6 minAllison 1000 tune: lockup in third and up, line pressure, Tow/Haul — and what to leave alone
The Allison behind a Duramax is the most forgiving transmission on our list and the one most often tuned badly. It will take a lot of pressure and a lot of lockup; it will also drop into limp mode the moment it sees slip it does not expect. A good Allison tune is as much about what you do not touch.
Read the guide Every platform · 5 minTransmission tune vs. engine tune: which one fixes your complaint?
Half the people who ask for an engine tune want their transmission fixed, and a few people who buy a transmission tune are really asking for the pedal. Here is how to sort the complaint before you spend money on the wrong file.
Read the guide Every platform · 5 minWhat “remote transmission tune” means, why it takes one business hour, and what you get back
Nothing ships, nobody plugs into your truck but you, and the file comes back within a business hour of payment. This is what happens in that hour, why it is enough time, and what should be in the email when it lands.
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