'Thump' going from drive to reverse, and vise versa, 07 STS4
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Cadillac STS Forum - 2005 through 2012 Discussion, 'Thump' going from drive to reverse, and vise versa, 07 STS4 in Past Cadillac Vehicle Discussion; Kinda working out all the 'new-to-me' car bugs. The car is an 07 STS4 3.6L, with 141k miles. When I ...
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    Boat's Avatar
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    'Thump' going from drive to reverse, and vise versa, 07 STS4

    Kinda working out all the 'new-to-me' car bugs.

    The car is an 07 STS4 3.6L, with 141k miles.

    When I shift from drive to reverse, or reverse to drive, I feel a thump, and the car kinda jumps a little bit. Correct me if I'm wrong, but I believe I have a bad mount somewhere. I checked out the 2 motor mounts under the car and they look to be ok. What does the trans mount(s) look like, and is there differential mounts also? Are any of these common weak points?

    Thanks for any guidance!

    Conrad

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    1BadCadSTS's Avatar
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    Diff bushing

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    Boat's Avatar
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    Re: 'Thump' going from drive to reverse, and vise versa, 07 STS4

    Did a little digging and found this, will look at the bushing after vacation. Sounds like a PITA job.

    http://www.cadillacforums.com/forums...placement.html

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    Re: 'Thump' going from drive to reverse, and vise versa, 07 STS4

    Creative Steel will sell you the upgraded replacement bushing, provide the tool & support for you or your local independent shop. What's your pleasure?

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    Re: 'Thump' going from drive to reverse, and vise versa, 07 STS4

    I'll attempt the work myself, thanks for the info!

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    Re: 'Thump' going from drive to reverse, and vise versa, 07 STS4

    Quote Originally Posted by Boat View Post
    I'll attempt the work myself, thanks for the info!
    This is a job best done up on a lift. Rasslin' it with limited overhead clearance on jack stands is a bear.
    Don't mess with Binky Bear!


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    Re: 'Thump' going from drive to reverse, and vise versa, 07 STS4

    I am young and nimble, plus our jack stands can go pretty high. I should be ok.

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    Re: 'Thump' going from drive to reverse, and vise versa, 07 STS4

    I did this job myself on jack stands in my buildings parking garage. the most important part is make sure to get creative steals bushing tool.
    it took me 3 hours. I was going easy and learning it all at the same time.

    once the diff is lowered it takes about 1 minute to remove the old bushing and put in the new one.

    here is what I did:

    block front tires and get rear of car up on stands.
    release muffler hangers
    remove driveshaft bolts
    support diff with jack.
    remove the 3 diff bolts.
    lower the jack and slide driveshaft out of diff.
    tip front of diff down around 45 degrees (you will need to spread the exhaust pipes apart to achieve this)
    attach creative steels removal tool
    hand twist or use ratchet to remove.
    properly orient new bushing (2 notches need to be vertical)
    attach creative steels removal tool in the press position.
    hand twist or use ratchet to press bushing in.
    jack up diff while sliding driveshaft back into place.
    re bolt everything, re hang mufflers

    done.

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    Excellent! Thank you for sharing!

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    Quote Originally Posted by scotty2109
    I did this job myself on jack stands in my buildings parking garage. the most important part is make sure to get creative steals bushing tool. it took me 3 hours. I was going easy and learning it all at the same time. once the diff is lowered it takes about 1 minute to remove the old bushing and put in the new one. here is what I did: block front tires and get rear of car up on stands. release muffler hangers remove driveshaft bolts support diff with jack. remove the 3 diff bolts. lower the jack and slide driveshaft out of diff. tip front of diff down around 45 degrees (you will need to spread the exhaust pipes apart to achieve this) attach creative steels removal tool hand twist or use ratchet to remove. properly orient new bushing (2 notches need to be vertical) attach creative steels removal tool in the press position. hand twist or use ratchet to press bushing in. jack up diff while sliding driveshaft back into place. re bolt everything, re hang mufflers done.
    You do that solo or need a second pair of hands?

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    Re: 'Thump' going from drive to reverse, and vise versa, 07 STS4

    I will notice a "bump" if I first start up and shift into gear without letting the engine RPM down.
    The first 30-40 seconds the motor revs high and will cause the trans to "pop"
    If your car is warmed up there is little "thump".
    I have felt this on my 99 STS N*, 07 CTS 3.6, and the same on my now 10 STS 3.6.
    The engines just love to rev high to build oil pressure at start, so if you shift early, you will get the "thump".
    With the N* it was in reverse that would really throw you.
    I'm patient so I sit and let it rev down, but with my 10 STS there is always that start-hesitation-go thing that someone here remarked about a while back.

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    Re: 'Thump' going from drive to reverse, and vise versa, 07 STS4

    Quote Originally Posted by REALTORBENJAMIN View Post
    You do that solo or need a second pair of hands?
    I did it myself without disconnecting the driveshaft, took about 4 hours. So probably would have been better to disconnect the driveshaft. It was a tight space without it disconnected but I made it work.

    ----------

    I used Creative Steel's poly bushing and their tool rental, and quite frankly I don't really notice a difference after changing the bushing out. Should I be looking at other mounts now?

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    Quote Originally Posted by Boat
    I did it myself without disconnecting the driveshaft, took about 4 hours. So probably would have been better to disconnect the driveshaft. It was a tight space without it disconnected but I made it work. ---------- I used Creative Steel's poly bushing and their tool rental, and quite frankly I don't really notice a difference after changing the bushing out. Should I be looking at other mounts now?
    Mmmm that was what I was afraid of. Looking at my bushing it doesn't look crushed or twisted like I've seen others. I'm getting a gopro camera soon so maybe I'll stick it under the car and go for a rip.

    I also bought the pinion seal kit so I need to change that any how; which includes sliding the drive shaft out anyway.

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    Re: 'Thump' going from drive to reverse, and vise versa, 07 STS4

    Anyone know if a bad motor mount would cause this thump? The poly rear diff bushing didn't really help.

  16. #15
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    Re: 'Thump' going from drive to reverse, and vise versa, 07 STS4

    Unfortunately, it could be a torque converter issue. Reset car power; disconnect battery cables, touch them together briefly to shortcut the wait for all the car's module power supply caps to drain and reconnect. The TCM has to re-learn your driving style.

    A dealer can flash the TCM with a new program. It could possibly help.

    Good luck!

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