4L60E slow speed changes after rebuilt, same as before.

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bowtie2

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On my 2003 Tahoe, 5.3 4X4, I am having difficult to cure shifting problems.
The 4L60E trans has recently been completely rebuilt, due to slow 2/3 and 3/4 speed changes. The solenoids have been replaced to. The situation is exactely the same as before the rebuilt.
I must tell that, I cannot find a professionnal rebuilder that can check transmission pressure in France where I live.
I am about to install a Transgo correcting kit to cure the bodyvalve problem, but that looks kind of difficult to do it, so I may go for a new body valve on it.
What do you think of these ideas?
 

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