Help!! Flexplate to converter fitment issue
#1
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Help!! Flexplate to converter fitment issue
I have a 2011 GMC sierra 1500. Transmission is a 6L80. Torque converter is a FTI triple disc 3000 stall. I took the stock L9H out of the truck and replacing it with a LSX 376 B-15. This engine has a 8 bolt rear main where the stock engine only had a 6 bolt rear main so I had to buy a flex plate. I ended up going with ATI's P/N 915737. This is an 8 bolt flex plate with a crank adapter.
How crank adaptor works on flexplate: you are supposed to place the crank adaptor over the crank at the rear of engine and then fit the flexplate over the adaptor and bolt them both to the engine.
Problem: tightend the converter bolts up to flexplate and began tightening the bellhousing bolts up to the engine. Before finishing this we attempted to turn the crank to verify that it still rotating. We found that the crank would hang up. It appears as if the converter is being pushed against the pump side of the transmission which is causing it to hang up. ATI swears up and down that this part should fit.
Assuming the converter is seated correctly. Will verify this evening and hopefully take some measurements from the bellhousing face to converter ears. Supposedly supposed to be around 1" and measure from flexplate to back of engine which should be less than 1".
Has anyone dealt with this? Any ideas or potentially other flexplates that others have run with the combinations without any issues?
Thanks for any help!
How crank adaptor works on flexplate: you are supposed to place the crank adaptor over the crank at the rear of engine and then fit the flexplate over the adaptor and bolt them both to the engine.
Problem: tightend the converter bolts up to flexplate and began tightening the bellhousing bolts up to the engine. Before finishing this we attempted to turn the crank to verify that it still rotating. We found that the crank would hang up. It appears as if the converter is being pushed against the pump side of the transmission which is causing it to hang up. ATI swears up and down that this part should fit.
Assuming the converter is seated correctly. Will verify this evening and hopefully take some measurements from the bellhousing face to converter ears. Supposedly supposed to be around 1" and measure from flexplate to back of engine which should be less than 1".
Has anyone dealt with this? Any ideas or potentially other flexplates that others have run with the combinations without any issues?
Thanks for any help!
#2
On The Tree
I have a 2011 GMC sierra 1500. Transmission is a 6L80. Torque converter is a FTI triple disc 3000 stall. I took the stock L9H out of the truck and replacing it with a LSX 376 B-15. This engine has a 8 bolt rear main where the stock engine only had a 6 bolt rear main so I had to buy a flex plate. I ended up going with ATI's P/N 915737. This is an 8 bolt flex plate with a crank adapter.
How crank adaptor works on flexplate: you are supposed to place the crank adaptor over the crank at the rear of engine and then fit the flexplate over the adaptor and bolt them both to the engine.
Problem: tightend the converter bolts up to flexplate and began tightening the bellhousing bolts up to the engine. Before finishing this we attempted to turn the crank to verify that it still rotating. We found that the crank would hang up. It appears as if the converter is being pushed against the pump side of the transmission which is causing it to hang up. ATI swears up and down that this part should fit.
Assuming the converter is seated correctly. Will verify this evening and hopefully take some measurements from the bellhousing face to converter ears. Supposedly supposed to be around 1" and measure from flexplate to back of engine which should be less than 1".
Has anyone dealt with this? Any ideas or potentially other flexplates that others have run with the combinations without any issues?
Thanks for any help!
How crank adaptor works on flexplate: you are supposed to place the crank adaptor over the crank at the rear of engine and then fit the flexplate over the adaptor and bolt them both to the engine.
Problem: tightend the converter bolts up to flexplate and began tightening the bellhousing bolts up to the engine. Before finishing this we attempted to turn the crank to verify that it still rotating. We found that the crank would hang up. It appears as if the converter is being pushed against the pump side of the transmission which is causing it to hang up. ATI swears up and down that this part should fit.
Assuming the converter is seated correctly. Will verify this evening and hopefully take some measurements from the bellhousing face to converter ears. Supposedly supposed to be around 1" and measure from flexplate to back of engine which should be less than 1".
Has anyone dealt with this? Any ideas or potentially other flexplates that others have run with the combinations without any issues?
Thanks for any help!
When I did my 4l60 to 4l80 swap, my TCI flex plate came with a crank pilot extender. Didn't have to use it as the converter was built to do away with it. The purpose of the pilot extender is to mount on the end of the converter snout and then slide into the end of the crankshaft. Only used if converter snout is not long enough. Snout only slides into crank about 3/16".
Hope this helps.
#4
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Not sure if you just typed it wrong, but trans should be fully bolted to engine before checking converter to flex plate clearance. Then tighten converter to flex plate.
When I did my 4l60 to 4l80 swap, my TCI flex plate came with a crank pilot extender. Didn't have to use it as the converter was built to do away with it. The purpose of the pilot extender is to mount on the end of the converter snout and then slide into the end of the crankshaft. Only used if converter snout is not long enough. Snout only slides into crank about 3/16".
Hope this helps.
Thanks again for the helpful comments.
#5
On The Tree
Snout of converter only needs to go into end of crank 3/16" or so when everything is bolted together. When I bought my converter from PTC, they also recommended sanding the paint off the converter snout and applying antiseize to the snout and crankshaft receiving hole. Flexplate does flex hence the name so converter actually moves a little in and out.
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