347strokin
Full Access Member
- Joined
- Oct 2, 2016
- Posts
- 167
- Reaction score
- 13
- Location
- Vancouver Island
- First Name
- Jon
- Truck Year
- 1987
- Truck Model
- R15
- Engine Size
- 350
Hello guys/gals,
Ever since I did my LS swap on my 87' C10, I've had some rough vibe issues from idle up to about 3000 rpms (This is approximate as it's been awhile now). These vibes persist whether I'm in Park or driving under load. The reason I'm posting here is to get more exposure and the cause and effects are the same. I'll give you some background.
I installed an LS3 to a 4L80E trans with a stock converter using a new TCI flex plate specifically for this combo. The trans had 240,000kms and I was told it was working just fine. Oil was clean and no metal in the pan or drain plug etc. The LS3 runs like a top.
Once I got everything running, I always had some rough vibes right from idle up to 3000 rpm or so.
Anyways, I unbolted the torque converter and all vibes are gone and she runs silky smooth. This made me think it was a bad torque converter as it already had a ton of miles on it.
I installed a brand new higher stall TCI converter and everything seemed fine for the first hour or so of run time, but now the vibes are back almost as bad.
I contacted TCI to see if there is a way to see if my converter is bad but they want me to ship it to them in the US to cut it open and inspect it.
I've now pulled my trans out again and I'm debating getting a rebuild while it's out.
SO...MY QUESTION IS: is there anything that could be causing these vibes from the transmission even while it's in Park? Just seems really weird to have two converters doing the same thing.
Any ideas would be very much appreciated. Thank you!
Jon
Ever since I did my LS swap on my 87' C10, I've had some rough vibe issues from idle up to about 3000 rpms (This is approximate as it's been awhile now). These vibes persist whether I'm in Park or driving under load. The reason I'm posting here is to get more exposure and the cause and effects are the same. I'll give you some background.
I installed an LS3 to a 4L80E trans with a stock converter using a new TCI flex plate specifically for this combo. The trans had 240,000kms and I was told it was working just fine. Oil was clean and no metal in the pan or drain plug etc. The LS3 runs like a top.
Once I got everything running, I always had some rough vibes right from idle up to 3000 rpm or so.
Anyways, I unbolted the torque converter and all vibes are gone and she runs silky smooth. This made me think it was a bad torque converter as it already had a ton of miles on it.
I installed a brand new higher stall TCI converter and everything seemed fine for the first hour or so of run time, but now the vibes are back almost as bad.
I contacted TCI to see if there is a way to see if my converter is bad but they want me to ship it to them in the US to cut it open and inspect it.
I've now pulled my trans out again and I'm debating getting a rebuild while it's out.
SO...MY QUESTION IS: is there anything that could be causing these vibes from the transmission even while it's in Park? Just seems really weird to have two converters doing the same thing.
Any ideas would be very much appreciated. Thank you!
Jon