Expert Tips and Advice
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A BMW, Audi, or Volkswagen comes in moving forward fine and doing nothing in reverse. On a ZF 5HP19, the broken drum is what failed. The valve body is why.Read now -
Wet Air Testing A Transmission: How To Catch Leaks On The Bench
You finish the rebuild, install the unit, and the road test shows a flare shift. Wet air testing during assembly finds that leak while the drum is still in your hands.Read now -
Transmission Valve Body Repair: Vacuum Test & Ream Guide
You pulled the pan and found the fluid dark, the magnet loaded. Now you are looking at a valve body, deciding whether it goes back on the bench or into the core pile.Read now -
8L90 Shudder Fix: GM TSB 18-NA-355, Additives, And Valve Body Repair
8L90 shudder is torque converter clutch shudder, and GM's TSB 18-NA-355 is one of three ways to fix it. Run the three-mode test first, then pick the fluid exchange, the additive, or the valve body repair.Read now -
Transmission Clutch Pack Clearance Specs by Family: 4L60E, 6R80, 46RE–48RE
If you rebuild automatic transmissions, clutch pack clearance is the number that decides how the job ends. Either the unit stays on the road for years, or it comes back on a hook. The problem is that the correct clearance is not one number. A 4L60E 3-4 pack, a Ford 6R80 direct clutch, and a 48RE front clutch all live in different factory windows. Guessing from a remembered rule of thumb is how a fresh rebuild ends up slipping under load or cooking its own fluid.Read now -
P0741 Code: How to Diagnose the Torque Converter Clutch and Find the Right Fix
Read nowKey Points Code P0741 indicates continuous slippage exceeding 200 RPM in the torque converter clutch. Ignoring this fault reduces fuel economy by 10% and causes harmful internal temperatures above 200°F. Wear on the valve body and TCC solenoids causes the...
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Must-Have Transmission Parts to Keep in Your Shop Inventory
Read nowEvery minute a vehicle sits on your lift waiting for a part, you lose billable hours — and you risk sending a good customer to the shop down the street. In high-volume transmission work, a supply-chain gap on a common...
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Worn Clutch Pack? How to Measure Clutch Wear in a 4L60E (and Other GM Units)
Read nowIf your classic GM truck slips between second and third, or the fluid comes out smelling burnt, a worn clutch pack is usually the first place to look. The good news: you do not have to guess whether an automatic...
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Transmission Pressure Testing Guide: Diagnosing Hydraulic Failures
Read nowTransmission slipping, hard shifts, or delayed engagement into Drive all point to the same root cause: loss of hydraulic pressure. These are not symptoms to wait on. Low line pressure accelerates clutch wear fast — and what starts as a...