4l80 tcc drag using a multi disk
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4l80 tcc drag using a multi disk Hello everyone I went ahead and replaced my stock stall on my 4l80 /ls3 swapped truck (factory stall was a turd) but did serve me well for over a year , I installed a 10inch 3600-3800 multi disk stall and after a few miles the next day I got the infamous tcc drag , ( truck would turn off aggressively as soon as I tried putting it In gear ) I see a lot of ppl fix this by installing the Sonnax line to lube PR valve to help feed the tcc release circuit , but my 80e allready has a “superior “PR valve installed when i built it ,which already has feed provision for tcc (small notch on it ) any pointers on where to look to solve this ?
setup is ls3 /cammed obs truck /4l80 trans : dual fed ,superior shift kit (includes said PR valve with notch on the land )
setup is ls3 /cammed obs truck /4l80 trans : dual fed ,superior shift kit (includes said PR valve with notch on the land )
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From: BERWICK PA
Well In car it hard but a .083 feed through pump wall there can help. also raisng AFL presure in tune can help , Likly you have a worn AFL valve . this can cause 2nd gear starts and dragging TCC at idle . Also if using the SONAX tcc regulator valve with tef ring using the stiffer of the two springs that came with it can hellp or get it and install it with the stiffer spring.
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Teching In
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Hmm I see , well regarding the afl valve , I have never had issues with 2nd gear starts , my only problem is tcc drag . Only change was removing the stock stall in replacement of this triple disk . One thing however that Cought my eye was that with this converter I had tight clearance , I believe I was bearly able to squeeze in the feeler guages to about .125 , converter did spin by hand but it was tighter then I normally use it maybe tighter then .125 since I had to jam in the feeler guages
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From: BERWICK PA
Hmm I see , well regarding the afl valve , I have never had issues with 2nd gear starts , my only problem is tcc drag . Only change was removing the stock stall in replacement of this triple disk . One thing however that Cought my eye was that with this converter I had tight clearance , I believe I was bearly able to squeeze in the feeler guages to about .125 , converter did spin by hand but it was tighter then I normally use it maybe tighter then .125 since I had to jam in the feeler guages
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Oh man dont run any more, You need a min of 1/8 inch and really with an 80 i would rather see 3/16 a min, Its likley you are pushing the gear into the pump back, HOPING no damage allready . You need one of these, not nessarily this thick they make them as thin as 1/8 inch https://www.amazon.com/Camotokiit-Tr...zcF9hdGY&psc=1
Do u know if having that tight converter spacing would block a return flow or any passage ?? (And yes I’m aware of the tight clearance destroying pumps , but since I got the .125 gauge in (thightly ) I rolled with and converter spun freely
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From: BERWICK PA
ok this is what I have been trying to get to with out me feeding someone this idea , After hours of reaserching I saw one post where they mentioned thight converter to pump clearance “amplifying “ the tcc dragging . (That is all the info about this I saw , I believe it was circle d member who said this ). He also mentioned this was seen in customers who had less then .100 clearance , I wish they elaborated more on this because I suspect that maybe the converter being that pushed in blocks a lube circuit of some kind ?
Do u know if having that tight converter spacing would block a return flow or any passage ?? (And yes I’m aware of the tight clearance destroying pumps , but since I got the .125 gauge in (thightly ) I rolled with and converter spun freely
Do u know if having that tight converter spacing would block a return flow or any passage ?? (And yes I’m aware of the tight clearance destroying pumps , but since I got the .125 gauge in (thightly ) I rolled with and converter spun freely
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From: BERWICK PA
Here is what I would do, Your clerance is really to tights, First thing pull pan if you find cast iron dust well you know a clean up and pump is due . of not then i would add the spacer probably a 1/8 one .
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ok thanks for confirming so I can be more willing to do the spacer , I got some spacers that are gonna give me 1/16 more of clearance so that should put me really close to 3/16 . The pump clearance should be fine I’ll check that after I just shim in the spacers with out moving much out the way I think I can slide them in with only loosing bolts
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Teching In
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ok thanks for confirming so I can be more willing to do the spacer , I got some spacers that are gonna give me 1/16 more of clearance so that should put me really close to 3/16 . The pump clearance should be fine I’ll check that after I just shim in the spacers with out moving much out the way I think I can slide them in with only loosing bolts
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Update got a 1/4 spacer installed between the engine and trans and was able to set proper converter to flex plate clearance and all is good. Be sure to have enough converter to flex plate gap guys !
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From: BERWICK PA
Of course otehr things can happen to had another guy after checking his crank thrust motion we determined his engine was trying to us his converter as a thrust bearing , It was worn slap out .
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Excellent I have noted this on a few 80e units when they come into be built the have excessive wear at back of pump center gear and on more than a few I have after having them check this found the clearance too close, Its seems to only happen with after market converters but has happned with a couple remans. Not to long ago a guy had to put in a 1/16th snim just to get over 1/8 inch after I noted wear in pump and had him check on reassembly.
Of course otehr things can happen to had another guy after checking his crank thrust motion we determined his engine was trying to us his converter as a thrust bearing , It was worn slap out .
Of course otehr things can happen to had another guy after checking his crank thrust motion we determined his engine was trying to us his converter as a thrust bearing , It was worn slap out .
4L80E
FTI triple disk
Pump wear plate
0.14 converter clearance, no shims used, perfect right out the box
.093 line to lube drilled
stock PR valve
no modifications to any of the other valves in the pump
jake’s D3 transbrake
EA adjustable pressure regulator (version 1) with 1 shim
185-190 pressure at wot
Front cooler port pressure when locked is 95
Front cooler port pressure when unlocked it 50
950 rpm idle
No converter drag
I’m aware of the modified PR valves and additional pump mods but I’m going to run it like this for awhile and see how it does.
FTI triple disk
Pump wear plate
0.14 converter clearance, no shims used, perfect right out the box
.093 line to lube drilled
stock PR valve
no modifications to any of the other valves in the pump
jake’s D3 transbrake
EA adjustable pressure regulator (version 1) with 1 shim
185-190 pressure at wot
Front cooler port pressure when locked is 95
Front cooler port pressure when unlocked it 50
950 rpm idle
No converter drag
I’m aware of the modified PR valves and additional pump mods but I’m going to run it like this for awhile and see how it does.
LS1Tech Sponsor
Joined: Mar 2023
Posts: 1,802
Likes: 1,144
From: BERWICK PA
4L80E
FTI triple disk
Pump wear plate
0.14 converter clearance, no shims used, perfect right out the box
.093 line to lube drilled
stock PR valve
no modifications to any of the other valves in the pump
jake’s D3 transbrake
EA adjustable pressure regulator (version 1) with 1 shim
185-190 pressure at wot
Front cooler port pressure when locked is 95
Front cooler port pressure when unlocked it 50
950 rpm idle
No converter drag
I’m aware of the modified PR valves and additional pump mods but I’m going to run it like this for awhile and see how it does.
FTI triple disk
Pump wear plate
0.14 converter clearance, no shims used, perfect right out the box
.093 line to lube drilled
stock PR valve
no modifications to any of the other valves in the pump
jake’s D3 transbrake
EA adjustable pressure regulator (version 1) with 1 shim
185-190 pressure at wot
Front cooler port pressure when locked is 95
Front cooler port pressure when unlocked it 50
950 rpm idle
No converter drag
I’m aware of the modified PR valves and additional pump mods but I’m going to run it like this for awhile and see how it does.
Interesting , In The OP case he did not have enough converter to flex plate clearance, I have seen this a few times causing dragging lockup. I can only assume the shaft is pushing in on the lockup disc , .
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Joined: Mar 2023
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From: BERWICK PA
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Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
1/8 to 3/16 converter pull out is perfectly fine... if the flexplate is flexing more than 1/8 something else is wrong. Can this clearance effect fluid flow out of the converter, effecting TCC drag/float? Sure but if you have a min of 1/8 it should be fine assuming all else is done correctly. 1/4 is absolute MAX pullout. any more and you risk the converter driving the pump gear into the housing or not getting full gear engagement and breaking the gear/hub.
-Dalton
-Dalton
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FTI COMPETITION CONVERTERS AND TRANSMISSIONS
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FTI Converter build sheet
FTI COMPETITION CONVERTERS AND TRANSMISSIONS
"IT'S NOT CHEATING, IT'S THE COMPETITIVE EDGE."
1-866-726-8358
info@ftiperformance.com
FTIPerformance.com
FTI Converter build sheet
