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#4486204 - 08/11/17 11:44 PM 6L80e fluid return line
cb4017 Offline


Registered: 08/11/05
Posts: 150
Loc: Northern Nevada
My Jeep JK Wrangler now has a GM LS 5.3L engine and a 6L80 transmission. I'm upgrading the tranny fluid cooler and want to make sure I have things flowing the right way. Which line is the fluid return line, top or bottom at the transmission? I thought it was the top line but found some conflicting information on the interweb.

Thanks!
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USN Ret., FPD Ret.

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#4486208 - 08/11/17 11:52 PM Re: 6L80e fluid return line [Re: cb4017]
Chris142 Offline


Registered: 06/05/03
Posts: 16973
Loc: Deplorable in apple valley, ca
Take one off and have someone start it,and be ready to turn it off.
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#4486214 - 08/12/17 12:06 AM Re: 6L80e fluid return line [Re: cb4017]
userfriendly Offline


Registered: 06/03/03
Posts: 2653
Loc: LaFinDuMonde
Bottom line from transmission to top of rad, return line is from bottom of rad to top of transmission.

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#4486235 - 08/12/17 12:45 AM Re: 6L80e fluid return line [Re: userfriendly]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: userfriendly
Bottom line from transmission to top of rad, return line is from bottom of rad to top of transmission.


That makes good sense. It would be easier for the fluid to flow down through the radiator--rather than flow upwards.

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#4486244 - 08/12/17 01:12 AM Re: 6L80e fluid return line [Re: Merkava_4]
cb4017 Offline


Registered: 08/11/05
Posts: 150
Loc: Northern Nevada
Originally Posted By: Merkava_4
Originally Posted By: userfriendly
Bottom line from transmission to top of rad, return line is from bottom of rad to top of transmission.


That makes good sense. It would be easier for the fluid to flow down through the radiator--rather than flow upwards.


Hmm, B&M says the input should be on the bottom on their Supercoolers if the connections are on the side. Seems fill from the bottom would ensure the cooler is filled where top feed maybe not. Come to think of it I guess it would depend on the type cooler. Tube and fin wouldn't matter where on a stack plate cooler it might.
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#4486250 - 08/12/17 02:05 AM Re: 6L80e fluid return line [Re: userfriendly]
clinebarger Offline


Registered: 12/19/13
Posts: 1994
Loc: Fort Worth, Texas
Originally Posted By: userfriendly
Bottom line from transmission to top of rad, return line is from bottom of rad to top of transmission.


The cooler feed/out is the TOP cooler line, The BOTTOM line is the return/lube on a 6L80E WHERE they come out of the bellhousing.
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#4486254 - 08/12/17 02:37 AM Re: 6L80e fluid return line [Re: cb4017]
userfriendly Offline


Registered: 06/03/03
Posts: 2653
Loc: LaFinDuMonde
Me bad, I do T350s & 400s bottom feed to cooler "in" at top of rad, bottom of rad return to top line on transmission.

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#4486255 - 08/12/17 02:47 AM Re: 6L80e fluid return line [Re: userfriendly]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Now you guys got me all kinds of confused. ???

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#4486272 - 08/12/17 04:30 AM Re: 6L80e fluid return line [Re: Merkava_4]
Lubener Offline


Registered: 01/22/11
Posts: 2614
Loc: N.Ohio
Originally Posted By: Merkava_4
Originally Posted By: userfriendly
Bottom line from transmission to top of rad, return line is from bottom of rad to top of transmission.


That makes good sense. It would be easier for the fluid to flow down through the radiator--rather than flow upwards.


Usually the bottom of the radiator cooler is the inlet. You want the fluid in the cooler longer so the heat is transfered. If it flows too quickly(from top to bottom), the transfer of heat is minimized. On my Buick, the bottom line was the fluid source into the radiator cooler.Not to be confused with the coolant which has far less pressure behind it.


Edited by Lubener (08/12/17 04:35 AM)
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#4486282 - 08/12/17 05:50 AM Re: 6L80e fluid return line [Re: cb4017]
userfriendly Offline


Registered: 06/03/03
Posts: 2653
Loc: LaFinDuMonde
I just R&R'd a couple of T350s 'n 400s a month ago. Before pulling them, I disconnected the top line from the radiator, put a hose on the end into a 5L oil jug and started the engines.
I got about 3 liters out that way, which otherwise would have ended up on the ground or driveway.
If in doubt, take both lines off with hoses into containers.

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#4486293 - 08/12/17 06:14 AM Re: 6L80e fluid return line [Re: cb4017]
Trav Offline


Registered: 11/20/06
Posts: 19345
Loc: MA, Mittelfranken.de
Find the line on the transmission from this slightly outdated chart and follow it to the radiator if in doubt.
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#4486373 - 08/12/17 08:37 AM Re: 6L80e fluid return line [Re: cb4017]
barkingspider Offline


Registered: 12/22/13
Posts: 2066
Loc: socal
Fluid goes into the cooler on the bottom and out from the top on the GM trucks I've owned. 6.0, 5.3 and 4.8
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#4486435 - 08/12/17 09:48 AM Re: 6L80e fluid return line [Re: Trav]
cb4017 Offline


Registered: 08/11/05
Posts: 150
Loc: Northern Nevada
Originally Posted By: Trav
Find the line on the transmission from this slightly outdated chart and follow it to the radiator if in doubt.


I found this chart. I also found others that indicated the opposite, hence my confusion. Guess I'm going to have to pull a line and do the bucket test. If it matters my transmission is supposed to be a 2013.
_________________________
Cliff
USN Ret., FPD Ret.

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#4487857 - 08/13/17 09:03 PM Re: 6L80e fluid return line [Re: cb4017]
clinebarger Offline


Registered: 12/19/13
Posts: 1994
Loc: Fort Worth, Texas
#8, Cooler Feed (Fluid OUT to cooler) Top line at the transmission.
#9, Center Lube (Fluid RETURN from cooler) Bottom line at the transmission.

I checked a 6L80E GM service manual & a 6L80E ATSG manual, Same picture in both!

All GM/Hydramatic RWD units are this way with the exception of the TH200 & 200-4R which are backwards.
Late 4L80E's have Front & Rear cooler lines, Front is feed, Rear is return.





Edited by clinebarger (08/13/17 09:03 PM)
_________________________
2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto

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#4488798 - 08/14/17 10:17 PM Re: 6L80e fluid return line [Re: cb4017]
cb4017 Offline


Registered: 08/11/05
Posts: 150
Loc: Northern Nevada
Awesome! Thank You Sir.
_________________________
Cliff
USN Ret., FPD Ret.

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