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I can't stress how much it sucks doing it on jack stands...

I doubt they are _too_ different when it comes to startup.

Mine does it on Wengerd and Ortiz tunes as well as the Roush. I always thought it was related to my chiller and condensation.

As always, your knowledge is greatly appreciated. Putting 1300hp aside, we mere mortals running 700ish wheel look to be "OK" going wide open in 7th? Or would it just be a matter of time before it slips?

Hi all, Last weekend I swapped my 3.55 diff for a 3.15, all went well, no issues. I have zero vibration, drives great, however... Coming to a stop braking <15mph I get 3-4 clicks from under the car that sounds midcar/front of the car about 70% of the time. I can feel them through the brake...

Curious which diff you guys have. I just swapped my 3.55 to a 3.15 and the trans feels much smoother, presumably because of the ratio change.

Is the injector plugged in still?

Old post revival, I'd like to thank you for this write up. Worked perfectly.

Doing this exact swap right now. I can't hook up in any gear so I feel limited to just using 6th

Annoying, if I take off slow enough it'll go 1st to 2nd and it's a jolt, then 2nd to 3rd the same. Sometimes going into 7th under medium accel is a jolt too. I have a 3.15 diff ready to go on in the hope that it'll smooth it out some and allow me to use any gear other than 6th WOT.

I'm in Tampa and would love to compare... mine is driving me crazy right now.

Do you run the MT SS full time? My PS4S (265/35/20) just can't hook up with the 3.55 diff.

I had to go with a chiller, sitting in the lanes my iat's were 129f before I started the run, 165f after. Now the longer I sit in the lanes the cooler they get. Honestly, this blower isn't the best, you'd be better off with a Whipple and a good heat exchanger

What diff are you running? I have the same set up on 3.55 and it'll hit 7th gear at that speed. Good time!

I had similar issues and replacing the VCT solenoids resolved it (95% anyway). Definitely use 5w-50.

You may find it's raspy without cats. I put high flow lth on mine with the stock exhaust and an H pipe and it was awful, made me cringe when I got on it. I went with a 3" steeda cat back and it sounds really deep, almost old school muscle car sounding. Ironically it has an pipe.

Yes they do, I bought a used kit and it didn't have the spacer. I had to buy a full idler set just for that spacer... something like $200... insane.

Those are the ones! I got mine from the Ford dealership via my vin to make sure.

$200 maybe for both. Fit them myself.

I had similar and it turned out to be the VCT solenoids. Not the most difficult to fit and cheap. Worth checking off the list of possible causes.