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Old 09-19-2022, 09:48 PM
74Grandville 74Grandville is offline
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Join Date: Mar 2003
Location: Plainville, CT
Posts: 1,785
Default 2007 GXP 4T65e-HD slips and no Manual shifting after rebuild

HI Guys,

I Just rebuilt the 4T65e-HD in my 2007 Grand Prix GXP. During the test drive i've noticed the car does not seem to hold either 2nd or 3rd gear and just slips and engine revs when driving. Also, when i shift into manual mode, no gears numbers or "M" shows on the dash. the padels do nothing. i'm wondering what my issue could be before dissessembling again.

One thing i replaced was the valve body separator plate as the original looked like the check ball areas in a couple spots where showing some good wear. The issue is the new ACDelco 24244404 part looks completly different then the original. I figured GM must have corrected a few things and installed it, but now i'm second guessing. there are 13 holes missing on the new plate and one hole that is a much larger size.

I called GM today to verify 24244404 was the correct part and they agreed, I asked if the computer would need reprograming with this part and they said no. they believe my issue is mechanical.

I'm wondering if there is anyone that has run into this before or has experience with this transmission.

I installed both the Superior 4T65e Kit and Superior K098 Valve Repair. Also all Solenoids are new.

my next step is to dig into the trans again and reinstall the old separator plate to see if this resolves the issue.

1979 Firebird Trans Am 301/4spd
1977 Firebird Formula 400/Auto
2007 Grand Prix GXP 5.3L
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