Asked on February 12, 2012
2002 GMC Yukon Drivetrain Problem with 80000 miles
What Specific Parts Should I Upgrade For A 4 L60 E Rebuild Used Light Towing?
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.
Asked by
tomcat750
+ follow question
Replies
Replied on February 13, 2012
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.
Answered by
Wrenchtech
(expert)
8,592 answers provided
Replied on February 13, 2012
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
Response from
tomcat750
Replied on February 14, 2012
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.
Answered by
rivermikerat
(expert)
3,087 answers provided
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