Thread: Help with my 4t65e-hd

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  1. #1 Help with my 4t65e-hd 
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    Hello so I have an 06 Grand Prix with a 3.8 l supercharged with the 4t65e - HD trans about the car a little over a year ago and the tranny started slipping immediately hard shifting I could tell it was going to go. So it finally did go and I could no longer accelerate from stop in first gear. So I went and I actually found an 06 supercharged Grand Prix in a Pick-A-Part junkyard that had been seized by the constable so I took a chance and I pulled the tranny let me start off by telling you I'm not a mechanic I'm a tradesman and I do all my mechanic work myself because it's too expensive to take it to a shop but I have never done anything close to a bigger job as a transmission but I figured whatever I take off I just put back on so I ended up changing the training with little problems. So I finally got to test drive it and it shifting good better than my car ever did but I do have a problem. So when I stop the car and drive actually or reverse just in gear then the torque converter starts making a loud noise almost like a grinding noise and the car feels like it's wanting to accelerate as soon as I let off the gas it pulls away faster than usual now when I'm in park or neutral I don't get the noise or the vibration but when I'm in drive and stopped I start getting that heavy vibration and almost like a grinding noise or maybe even sounds like it's idling high it's hard to describe but was just wondering if anybody had any advice for me. So basically I swapped a transmission out in my 06 Grand Prix same tranny as the original and now my torque converter or it sounds like it's coming from the torque converter is making a loud noise when non-accelerating in drive or gear but fine when driving.
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  2. #2 Re: Help with my 4t65e-hd 
    GXP Level Member GTPpower's Avatar
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    Is it throwing any codes?
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  3. #3 Re: Help with my 4t65e-hd 
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    Nope not throwing any codes. But it is leaking from what looks like torque converter
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  4. #4 Re: Help with my 4t65e-hd 
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    Quote Originally Posted by GTPpower View Post
    Is it throwing any codes?
    Nope no codes. It' is leaking tranny fluid from. What looks like torque converter.
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  5. #5 Re: Help with my 4t65e-hd 
    Turbo is the way to go. BillBoost37's Avatar
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    Which converter did you use, the new one or old one?
    Also, did you wiggle giggle the converter before mating it to the engine to ensure it was still fully seated on the shaft?
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  6. #6 Re: Help with my 4t65e-hd 
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    Quote Originally Posted by BillBoost37 View Post
    Which converter did you use, the new one or old one?
    Also, did you wiggle giggle the converter before mating it to the engine to ensure it was still fully seated on the shaft?

    I used the converter that I got from pick apart with the tranny. So the new (used) one. Also wasn't to familiar with it had it in the street with H.O.A threatening to tow so I was rushed and didn't watch any videos or read up on it first. The converter fell off the tranny in my trunk during transport. I slipped it back on shaft and it went rather easily, I would say the mounts to bolt on the converter were flush with case of tranny my buddy tapped gently with a rubber mallet and it didn't recess anymore so we put it on.
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  7. #7 Re: Help with my 4t65e-hd 
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    was torque converter from pick n pull or original?
    08 grand prix NA3800
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  8. #8 Re: Help with my 4t65e-hd 
    GXP Level Member GTPpower's Avatar
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    I would drain the fluid and see if you have any metal in the pan. However, I think chances are good you'll be pulling it back out and at least replacing the converter.


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  10. #9 Re: Help with my 4t65e-hd 
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    Was the converter from pick a part.
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  11. #10 Re: Help with my 4t65e-hd 
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    I actually just did that to replace pan gasket and there was no metal shavings. That's what I was starting to think maybe put the original torque converter back in it
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  12. #11 Re: Help with my 4t65e-hd 
    Turbo is the way to go. BillBoost37's Avatar
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    To me it sounds like the converter wasn't fully seated. You always need to spin them by hand and wiggle/push them in to ensure they are all the way in. Flush with trans bell housing is too far out.

    I'm internet guessing here that it's not fully seated. GTPower.. check me here, will a converter that is close but not fully seated leak? Maybe I'm wrong on my thought. Few beers in and thinking..if its not fully seated it'll leak, but rethinking......is that oring far enough out that it might?
    I drink..so consider that when reading my posts.

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  13. #12 Re: Help with my 4t65e-hd 
    GXP Level Member GTPpower's Avatar
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    I don't know the answer to that for sure either, but it seems logical to me that it could leak. It definitely needs to go on farther than that.


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  14. #13 Re: Help with my 4t65e-hd 
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    i dont know if it would aplpy here but on some vehicles if ya break the TC free from flywheel there should be some play if the TC is seated properly.
    08 grand prix NA3800
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