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Replacing Tranny Issues

Jeffrey1988

New Member
Joined
Dec 18, 2021
Messages
5
I have a 2004 5.3L Z71 Avalanche with the 4L60E tranny with way too many miles on it. The tranny failed. I found another 4L60E in a 1999 4x4 Blazer with a 4.2L V6 that I replaced the bad one with. I swapped the bell housings and the transfer cases and put the Avalanche's back in the Avalanche on the Blazer's tranny along with a brand new torque converter. I should mention that I did the work basically in the snow and the first fluid I put down the dip stick was a quart of Lucas Anti Slip followed by a quart of fresh tranny fluid but the tranny fluid was cold and so was the tranny. The Lucas was preheated so that I was able to get it into the tranny. Then I started the engine and ran it for almost 5 seconds and shut it off. I added more fresh tranny fluid then started the engine and let it run while I finished filling the transmission with fresh fluid truck doesn't move. I can hear the engine bog down a bit with each of the gears I select but I have no movement. I haven't raved it up much but I have at least let it get warm and a few different times over the course of a few days. I've checked all electrical connectors 3 times. Is there a difference between the trannys that I'm unaware because the Avalanche still doesn't move. What did I miss? Please I need some help!
 
Only step I didn't read would have been adding transmission fluid inside new torque converter before attaching to transmission. Although a mechanic buddy of mine said the trans pump should pump fluid into it just fine.
Don't know if transmission is different or not. Good luck
Maybe a heat gun pointed at transmission pan, warm up help fluid movement until pressure enough to work.
Torque converter needs a certain level of fluid to grab I believe, mine slipped until got enough fluid in.
40mph to 50 it got air bubbles or something, till I filled deep pan with enough fluid.
I didn't swap my transmission just torque converter.
 
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