Fresh rebuilt 4L80e Slips in forward and reverse
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Fresh rebuilt 4L80e Slips in forward and reverse 4L80e transmission in my son's 2000 Silverado 5.3L with segment swap using HPTuners. Trans tune is stock 80e. Has a brand new Circle D pro billet 3000rpm torque converter. My son and I built the transmission with many mods and upgrades. we used the CK Performance 4L80ECC/MSRK kit. instructions can be found at the following link to see all the modifications that entail. https://www.ckperformance.com/files/...ONS%20ebay.pdf . We replaced all the bushings, and o-rings lips seals etc. All seemed to aircheck fine while building. We had to replace some parts from a core transmission. The input shaft and one of the drums. also, put a new sun gear in. We also reamed the AFL bore and installed an oversized valve. end plugs were replaced with o-ringed plugs. All electrics except the EPC were replaced. The fluid level is good (calibrated dipstick), and has line pressure that should make it move I think. Any help would be appreciated. This video is with the harness plugged in. Have another vid with harness unplugged. Pressure was higher unplugged, over 320 in reverse, but still mad slippage. Converter pull out was a little under 3/16, but with the smallest shims that came with the converter it was less than 1/8. So went shimless.
Last edited by TravRMK800; Dec 22, 2022 at 03:38 PM. Reason: bad video link
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Also, there is a whine when revving you can hear in the video. That had me thinking the pump, but the pump was mint when we put it in, and it is making pressure at the test port. Is there somewhere that could leak and still show pressure at that port? Sorry if the questions are dumb, but this is my first auto transmission build, and it is my son's truck. We are building it together. He was super bummed when it wouldn't move well enough to drive.
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I can also hear that whine on the video. So the converter spacing was less than 3/16"? That would be okay. I like to measure with a straightedge across the bell housing to the converter pads when installing to make sure it's seated correctly. Should measure like 1" to 1 1/16".
What year is your unit? They changed the lubrication in 1997. The earlier units have a sun gear with 2 flats in the inside, later models sun gear with 4 flats. I wonder if it's related to that?
What year is your unit? They changed the lubrication in 1997. The earlier units have a sun gear with 2 flats in the inside, later models sun gear with 4 flats. I wonder if it's related to that?
Does it slip when you put it into D3, D2, and D1 also? If it holds in D3, D2, and D1 but not in D4 or reverse, then that's the sign of a OD roller clutch issue. If it's slipping in all gears it may be a pump issue.
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slips in all gears. I thought pump, but it has pressure as measured from the test port. Even if the pump was eating itself with the line pressure it has it should still move. At least that is what I keep thinking. This is my first auto trans build, so I could be wrong.
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From: Nitro Alley
The 4L80E is a 2002 Model Year Unit... Correct?
You said some additional Parts were needed from another Transmission Core...
What Model Year was this Unit?
...And what Parts did you take from it?
Hopefully you did not "Mix and Match" Parts from incompatible Model Years.
What other modifications were done, other than what is listed in the Instructions that you Posted?
You said some additional Parts were needed from another Transmission Core...
What Model Year was this Unit?
...And what Parts did you take from it?
Hopefully you did not "Mix and Match" Parts from incompatible Model Years.
What other modifications were done, other than what is listed in the Instructions that you Posted?
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Nothing other than the temp sensor on the internal harness. Temp only got to about 80-85 degrees reading off that. The ambient temp was super cold though. The core trans we swapped the pump, input shaft and one of the drums from was a 99-07 body style truck. the bell housing was broken and was sitting in the bed of the truck at a junk yard. I have the case and can check later if needed.
Last edited by TravRMK800; Dec 23, 2022 at 10:59 AM. Reason: forgot to mention pump was swapped also
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From: Roxana, IL
I see a lot of ring cut forward drums. Yes it has a groove in between the ring lands, some may call that the damage. You have to pay very close attention to the ring surface itself to see the damage. This doesn't apply to a slip in both forward & reverse.
What did you torque the pump halves to?
What did you torque the pump to case bolts to?
Did you match pump casting #'s?
Did you make sure the OD one way holds before transmission assembly?
The OD one way roller has to hold for either gear to work. I have had a couple of later small diameter roller clutch not hold when assembled. The cage gets caught on the drum and doesn't allow the rollers to ride up so it will lock. The aftermarket ones are really bad about it.
I attached the whats on when for that unit and TranGo's pump to case matching for reference.
It doesn't sound as if the pump halves are mismatched though. 2002 unit with a pump from a 99 and up core.
What did you torque the pump halves to?
What did you torque the pump to case bolts to?
Did you match pump casting #'s?
Did you make sure the OD one way holds before transmission assembly?
The OD one way roller has to hold for either gear to work. I have had a couple of later small diameter roller clutch not hold when assembled. The cage gets caught on the drum and doesn't allow the rollers to ride up so it will lock. The aftermarket ones are really bad about it.
I attached the whats on when for that unit and TranGo's pump to case matching for reference.
It doesn't sound as if the pump halves are mismatched though. 2002 unit with a pump from a 99 and up core.
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Pretty sure the torque for the pump halves and the pump bolts were both 18ftlbs. Whatever the ATSG manual said when we were going through it. The OD 1 way locked when checking by hand when we were assembling. The pump halves are not mismatched, but we did take the entire pump from the donor trans. Not sure on the year of that one. If it is an 04+ pump it should still work in an 02 case if I am understanding correctly. Is that right? The weird whine keeps making me think pump or converter. The converter is a brand new 3k stall circle D billet. I can't imagine it being bad out of the box though. And the pump is making pressure. I am just baffled, and my head is hurting. Been trying to research this and can't find anyone that has a similar situation.
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I see a lot of ring cut forward drums. Yes it has a groove in between the ring lands, some may call that the damage. You have to pay very close attention to the ring surface itself to see the damage. This doesn't apply to a slip in both forward & reverse.
Did you make sure the OD one way holds before transmission assembly?
The OD one way roller has to hold for either gear to work. I have had a couple of later small diameter roller clutch not hold when assembled. The cage gets caught on the drum and doesn't allow the rollers to ride up so it will lock. The aftermarket ones are really bad about it.
I attached the whats on when for that unit and TranGo's pump to case matching for reference.
It doesn't sound as if the pump halves are mismatched though. 2002 unit with a pump from a 99 and up core.
Did you make sure the OD one way holds before transmission assembly?
The OD one way roller has to hold for either gear to work. I have had a couple of later small diameter roller clutch not hold when assembled. The cage gets caught on the drum and doesn't allow the rollers to ride up so it will lock. The aftermarket ones are really bad about it.
I attached the whats on when for that unit and TranGo's pump to case matching for reference.
It doesn't sound as if the pump halves are mismatched though. 2002 unit with a pump from a 99 and up core.
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From: Nitro Alley
I see a lot of ring cut forward drums. Yes it has a groove in between the ring lands, some may call that the damage. You have to pay very close attention to the ring surface itself to see the damage. This doesn't apply to a slip in both forward & reverse.
What did you torque the pump halves to?
What did you torque the pump to case bolts to?
Did you match pump casting #'s?
Did you make sure the OD one way holds before transmission assembly?
The OD one way roller has to hold for either gear to work. I have had a couple of later small diameter roller clutch not hold when assembled. The cage gets caught on the drum and doesn't allow the rollers to ride up so it will lock. The aftermarket ones are really bad about it.
I attached the whats on when for that unit and TranGo's pump to case matching for reference.
It doesn't sound as if the pump halves are mismatched though. 2002 unit with a pump from a 99 and up core.
What did you torque the pump halves to?
What did you torque the pump to case bolts to?
Did you match pump casting #'s?
Did you make sure the OD one way holds before transmission assembly?
The OD one way roller has to hold for either gear to work. I have had a couple of later small diameter roller clutch not hold when assembled. The cage gets caught on the drum and doesn't allow the rollers to ride up so it will lock. The aftermarket ones are really bad about it.
I attached the whats on when for that unit and TranGo's pump to case matching for reference.
It doesn't sound as if the pump halves are mismatched though. 2002 unit with a pump from a 99 and up core.
I purchase TONs of them, to re-sleeve and re-bush!
The replacement Bushing is wider too!
Omega Machine and Tool.
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From: Roxana, IL
TECH Enthusiast
Joined: Jan 2019
Posts: 677
Likes: 490
From: Roxana, IL
It definitely held when we assembled it and checked it by hand. maybe it got stuck on first start? Looking at that chart you sent, I think you might be on to something since that roller is pretty much always holding. That could produce that whining sound too possibly I think. Just wish I didn't have to pull it out of the truck to see. Thanks for the direction.
Whines usually come from converter or the pump.
Converters are along for the ride until placed in gear. They rotate with engine RPM and the input haft usually turns along with it. You will get an input RPM reading on a scan tool. The RPM reading will go to "0" when placed in gear. That is when converters will whine. Pitch of the whine may change with RPM's while in gear.
Pumps run all the time. The whine will change with RPM, but will be constant while the engine is running.
Pump whines are usually caused by the inner gear wear in the inside where they ride in the converter hub. This looseness allows the inner gear to rub the crescent in the pump. Solved by new gears or making a minor cut to the crescent about 3/4" long the full depth on the crescent itself. (personally I like new gears, but have had them whine too.)
I suggest making the some of the lube mods in post 39 of
https://ls1tech.com/forums/automatic...ispreloading=1
I know some of these are covered in the CKPerformance kit you bought. But the one to the outer pump body is not. It's best done with a milling machine, but I have seen it done and have done it with a die grinder and very careful hands.. If you have to pull the trans and get back in to it!
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If OP has a leak due to valve body gasket or sealing ring issue, wouldn't that cause his line pressure to be low? That's what I can't visualize either. Or does the pump still provide enough volume to overcome the leak, but not enough pressure to engage the forward clutch (because of leakage)?
How are the input sensors monitored for rotation? Fancy scan tool? I think a DVOM in AC mode would generate "something" if the input speed sensor is seeing rotation, right? Would want to see if forward drum is spinning, but doesn't see like it? Or just an inspection mirror?
How are the input sensors monitored for rotation? Fancy scan tool? I think a DVOM in AC mode would generate "something" if the input speed sensor is seeing rotation, right? Would want to see if forward drum is spinning, but doesn't see like it? Or just an inspection mirror?
Probably a dumb question, But are you used to a 3000 stall., It will feel like slipping till you get to around 3000 rpm in any gear position. The line rise seems pretty normal and the drop and back up as you move through gears.
The whine does it only happen when trans still in first gear? or all shifted gears 2-3-4 .
4l80e planets can be noisy in first gear and if you got one with straight cut really noisy.
The whine does it only happen when trans still in first gear? or all shifted gears 2-3-4 .
4l80e planets can be noisy in first gear and if you got one with straight cut really noisy.
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