What Specific Parts should I Upgrade For A 4L60E Rebuild Used For Light Towing?

  • 2002 GMC YUKON
  • 80,000 MILES

Moving past the premise that my 4L60E transmission is currently in the repair shop due to a worn out 3/4th clutch. In order to slightly 'beef up' my tranny rebuild [for weekend trailering a 2000lb boat on mostly moderate terrain(Phx, Az), what specific parts might I ask to be installed (vs factory OEM)? Ie: 4 vs 7 (3/4th gear clutch pack assembly), corvette servo, beefier sun shell, 5 pinion planetary, bigger boost valve(.500 dia), single vs dbl gauge sprag, 7 vs 10 pump rotor vein? Also I have read several forums talking about having the valve body drilled out in a certain passage? These are the possible upgrades I was hoping to get expert advice on. I would appreciate any suggestions that would help me decide during my rebuild process. Thanks! Tom

Do you
have the same problem?
Sunday, February 12th, 2012 AT 8:23 PM

1 Reply


I would definitely install a secondary trans oil cooler. A good sized one. I don't think any of us here are super expert trans upgrade guys. I'll ask around.

Was this
Sunday, February 12th, 2012 AT 8:55 PM

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