Grinding with new trans/tc install
Thread Starter
On The Tree
Joined: Jul 2011
Posts: 178
Likes: 0
From: San Diego,CA
Grinding with new trans/tc install Hey all,
I just installed a performabuilt lvl2 4l60e and an FTI 3600 TC and now I'm experiencing a bit of a grinding in OD at low speeds. The install went well and I triple checked all of my measurements and tourqued everything to spec to make sure I would have no issues. The transmission shifts perfectly throughout all of the gears unless I hit OD while I'm going <40 MPH, then there is a grinding sound and slight vibration, but it goes away if i manually shift it into 3rd. It doesn't happen if I hit OD while at highway speeds. I haven't had the car tuned yet. Could this just be a tuning issue because I haven't adjusted the line pressure, shift points etc?
I just installed a performabuilt lvl2 4l60e and an FTI 3600 TC and now I'm experiencing a bit of a grinding in OD at low speeds. The install went well and I triple checked all of my measurements and tourqued everything to spec to make sure I would have no issues. The transmission shifts perfectly throughout all of the gears unless I hit OD while I'm going <40 MPH, then there is a grinding sound and slight vibration, but it goes away if i manually shift it into 3rd. It doesn't happen if I hit OD while at highway speeds. I haven't had the car tuned yet. Could this just be a tuning issue because I haven't adjusted the line pressure, shift points etc?
TECH Junkie
Joined: Nov 2013
Posts: 3,913
Likes: 366
From: White Bear, Mn
I'm guessing it is a tunning issue. I'm guessing it is your converter locking at very low rpm's. That can be taken care of in a tune. I have mine set so it will not lock in first, second or third at all and only in over drive if I am going faster than 40 mph.
When you are experiencing the chatter next time keep your speed but also gently apply your brake. This will unlock your converter and the chattering should go away in turn it being a lock up issue at to low of speed that will easily be taken care of in a tune
When you are experiencing the chatter next time keep your speed but also gently apply your brake. This will unlock your converter and the chattering should go away in turn it being a lock up issue at to low of speed that will easily be taken care of in a tune
Thread Starter
On The Tree
Joined: Jul 2011
Posts: 178
Likes: 0
From: San Diego,CA
I'm guessing it is a tunning issue. I'm guessing it is your converter locking at very low rpm's. That can be taken care of in a tune. I have mine set so it will not lock in first, second or third at all and only in over drive if I am going faster than 40 mph.
When you are experiencing the chatter next time keep your speed but also gently apply your brake. This will unlock your converter and the chattering should go away in turn it being a lock up issue at to low of speed that will easily be taken care of in a tune
When you are experiencing the chatter next time keep your speed but also gently apply your brake. This will unlock your converter and the chattering should go away in turn it being a lock up issue at to low of speed that will easily be taken care of in a tune
TECH Junkie
Joined: Nov 2013
Posts: 3,913
Likes: 366
From: White Bear, Mn
It will unlock immediately and you will feel it and see it with a slight jump in rpm's.
Just barley hold your foot on the brake. As long as you have your foot on the brake the converter will stay unlocked.
Just barley hold your foot on the brake. As long as you have your foot on the brake the converter will stay unlocked.
