4l80 brass in pan
TECH Fanatic
Joined: Jan 2015
Posts: 1,114
Likes: 33
From: Fort Worth, Texas
As Ryan Porter stated could be a Thrust washer, Or a Bushing.
4L80E/TH400 make brass, But that is a lot for 2,000 miles! I would say to check rear endplay, But not easy to do unless the unit is standing up.
You can check if the unit is oiling......Get the unit through & through hot, Pull the rear Cooler line, Run a hose from the line to a bucket, Start the vehicle.....Should have good flow.
The Pressure Regulator/Boost Valve puts priority to Line Pressure, If the Pump is worn or has a leak, The Regulator can shut off Cooler/Lube flow. And even make the TCC clutch drag at hot idle.
The Trans Go shift kit has a Pressure Release Valve that is prone to leak. Their Boost Valves are **** in my opinion. That shift kit isn't even needed if the unit is being built, Dual Feeding the Directs can be done internally when apart, They are nice for wreaking yard pull outs for the cheapskates
Maybe it would be best to have it built right, Some builders think they can throw Frictions & a Shift Kit at it & call it good.....The 4L80E is a stout unit, But they can wear out. I built a '01 core the other day that was in real bad shape, The Boost Valve was worn, Regulator bore had to be oversized, AFL Bore oversized, Pump gears worn, Direct Drum where the Rings ride....Didn't know the Plastic rings could wear the drum like that, Seen Cast rings do it though. Every bushing was shot, Even the Long one in the Center Support.
4L80E/TH400 make brass, But that is a lot for 2,000 miles! I would say to check rear endplay, But not easy to do unless the unit is standing up.
You can check if the unit is oiling......Get the unit through & through hot, Pull the rear Cooler line, Run a hose from the line to a bucket, Start the vehicle.....Should have good flow.
The Pressure Regulator/Boost Valve puts priority to Line Pressure, If the Pump is worn or has a leak, The Regulator can shut off Cooler/Lube flow. And even make the TCC clutch drag at hot idle.
The Trans Go shift kit has a Pressure Release Valve that is prone to leak. Their Boost Valves are **** in my opinion. That shift kit isn't even needed if the unit is being built, Dual Feeding the Directs can be done internally when apart, They are nice for wreaking yard pull outs for the cheapskates
Maybe it would be best to have it built right, Some builders think they can throw Frictions & a Shift Kit at it & call it good.....The 4L80E is a stout unit, But they can wear out. I built a '01 core the other day that was in real bad shape, The Boost Valve was worn, Regulator bore had to be oversized, AFL Bore oversized, Pump gears worn, Direct Drum where the Rings ride....Didn't know the Plastic rings could wear the drum like that, Seen Cast rings do it though. Every bushing was shot, Even the Long one in the Center Support.
Thread Starter
TECH Fanatic
Joined: Jun 2014
Posts: 1,533
Likes: 12
I needed a trans for my swap my friend who owns a trans shop had a 99 case . He got a core from bone yard and built it using trans go 2. I saw the core it looked to be an early case . Im thinking something might be mismatched? In all fairness I have been beating the bag out of this thing the other thing is I'm using a quick one controler. They have a part# for the holley epc u need . I ran the part # of the one in trans it's from a 4l60 not sure if this matters
TECH Fanatic
Joined: Jan 2015
Posts: 1,114
Likes: 33
From: Fort Worth, Texas
I needed a trans for my swap my friend who owns a trans shop had a 99 case . He got a core from bone yard and built it using trans go 2. I saw the core it looked to be an early case . Im thinking something might be mismatched? In all fairness I have been beating the bag out of this thing the other thing is I'm using a quick one controler. They have a part# for the holley epc u need . I ran the part # of the one in trans it's from a 4l60 not sure if this matters
Mismatching parts from '91-'96 cores with '97 & up cores is a Very Bad idea! I learned that the hard way 15 years ago. I keep all Early & Late parts & cores separate just for that reason. The Lube system alone is vastly different.
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Thread Starter
TECH Fanatic
Joined: Jun 2014
Posts: 1,533
Likes: 12
Well I tested line pressure and it seemed ok . I updated my controller to the quick 4 that has on board diagnostics and basically trans is slipping even at max line pressure. I'm thinking of a gmpp 4l85 or a jakes 4l80
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