4L80e conversion ready to pull my hair out!
4L80e conversion ready to pull my hair out! To update everyone. After a Yank 4L80e C5 transmission conversion I had horrific vibration....in park....and when driving!
So.....I pulled the setup. Sent the Drive Shaft Shop drive shaft back to check for balance....it was fine.
Sent the rear bellhousing, Rear torque tube bearing carrier, rear flex plate, converter, transmission bellhousing and transmission pump back to Precision Industries (Terri made all the parts for the conversion). Everything checked out as far as alignment of the components and the torque converter balance was fine.
I also eliminated the "two piece" Yank torque tube.(it was .150 out of round) I shortened a new torque tube and mounted the complete setup as GM designed it.
I also replaced both rubber drive shaft couplers with new GM units. All bearings were changed, I also checked for straightness of the torgue tube input splined shaft....all checked good...
Quess what.........I still have horiffic vibration....
I have replaced and checked all the parts that I can...all components have been checked..........
I am at a loss.......I dont know what to do....I am ready to hang up this whole project after a year and 12,000 dollars later...
I am running poly engine mounts... evrything else....(engine and engine flexplate are the same as when I ran the 4L60e and didnt have a problem.
Any ideas?
tom
So.....I pulled the setup. Sent the Drive Shaft Shop drive shaft back to check for balance....it was fine.
Sent the rear bellhousing, Rear torque tube bearing carrier, rear flex plate, converter, transmission bellhousing and transmission pump back to Precision Industries (Terri made all the parts for the conversion). Everything checked out as far as alignment of the components and the torque converter balance was fine.
I also eliminated the "two piece" Yank torque tube.(it was .150 out of round) I shortened a new torque tube and mounted the complete setup as GM designed it.
I also replaced both rubber drive shaft couplers with new GM units. All bearings were changed, I also checked for straightness of the torgue tube input splined shaft....all checked good...
Quess what.........I still have horiffic vibration....
I have replaced and checked all the parts that I can...all components have been checked..........
I am at a loss.......I dont know what to do....I am ready to hang up this whole project after a year and 12,000 dollars later...
I am running poly engine mounts... evrything else....(engine and engine flexplate are the same as when I ran the 4L60e and didnt have a problem.
Any ideas?
tom
If everything checks out on the back side what about the balance of the crank shaft. I am unsure but aren't the corvettes externally balanced? If so was thier any weight added on to the flexplate?
After checking everything you have, the only thing that is really left if the 4L80E. How has Yank stood behind their product. I would be pretty upset too after spending $12K.
Keith
Keith
I know the truck guys who did the 4L60 to 4L80 swap had to use the 6.0 flexplate with crank spacer. Are you still using the 4l60 flexplate?
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