2017 GT PP rear end shifting under acceleration

[SNSTRGT]

Hey everyone, bought a 17' GT PP Nov 2025 62k miles. Mods CAI, axle back, BMR level 2 lock out, and diff bushings. I've noticed 2 things since owning it. First is only after car warms up from a dead stop I start off slow I get a rear clunk/pop. You can actually feel the car move with it like a left to right motion. Small but feel it in the seat. If I push the clutch in or get above say 5-10mph it stops and is very smooth. Second when I go WOT feels like the front of the car pulls left, I would compare to a drag car twisting the chassis. Not to quote Dom lol. Other day did a pull and felt the front end move to the left and around 85mph I hear the rearend pop (like at low speed) and literally felt like the car actually centered up. I have looked for months and the only things I have come up with is do the lockout kit and diff bushings. I have torqued axle nuts and checked most bolts and nuts that i could get to for toque and everything seems to be tight as it should. Other things I haven't done are thrust washer on axles or LCA bushings or vertical links. Seems those are common pieces that others replace. Any thoughts are appreciated. Thanks!

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[EchoFiveR3531]

Check your toe links and your LCAs and make sure the bolts are properly torqued. I had a Ford dealer replace one of my rear half shafts and rear wheel bearing under warranty.

When I got the car back the rear end felt very loose, at first I brushed it off but then I realized something was wrong.

My rear LCA bolts and rear toe link bolts were never tightened. I could see gaps where the rear toe link tightens! I torqued everything to specs and the car was completely different, back to normal.

Edit: Well I see that you have checked most everything so this may not be it.

 

[SNSTRGT]

EchoFiveR3531 thanks for the comment. I have checked the torque but I have heard those bushings on the LCA can shred pretty quick so replacing with spherical seems like the best choice. Really every bushing needs to be replaced. Ford had the right idea but didnt execute well on building it good. Had an 01 Cobra with IRS and I had completely confidence in it. Thanks again for replying.

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