What specific parts should I upgrade for a 4L60E rebuild used for light towing?

TOMCAT750

MEMBER
2002 GMC YUKON
80,000 MILES

My 02 Yukon transmission won't work in 3/4 gear due to slippage. The transmission is currently being rebuilt. Because I use it to tow lightweight trailers occasionally, what specific parts should be upgraded during the rebuild process? The transmission is a 4L60E with 80k miles.

Sunday, February 12th, 2012 AT 12:54 PM

3 Replies

WRENCHTECH

MECHANIC
20,761 POSTS

Upgrade? I don't know what you mean by "upgrade". If you have damaged "hard parts", then they have to be replaced. The replacements with be the same parts that it came with.

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Sunday, February 12th, 2012 AT 1:14 PM

TOMCAT750

MEMBER
4 POSTS

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 in moderate terrain, what specific parts might I ask to be installed (vs factory OEM)? Ie: 4 vs 5(? Or more?)3/4th gear clutch pack assembly, corvette servo, beefier sun shell, 5 pinion planetary, bigger boost valve, single vs dbl gauge sprag, 7 vs 10 pump rotor vein, and 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

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Sunday, February 12th, 2012 AT 2:03 PM

RIVERMIKERAT

MECHANIC
6,110 POSTS

All I really suggest is beefing up the cooling system. Add an external trans oil cooler. And go with a higher ratio of coolant to water than 50/50, like 75/25. You live in Arizona, heat is your biggest enemy there.

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Monday, February 13th, 2012 AT 10:01 PM