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Can I run dex6 in my th400. #4366156
03/28/17 10:54 PM
03/28/17 10:54 PM
Joined: Mar 2013
Posts: 1,009
NY
joegreen Offline OP
joegreen  Offline OP

Joined: Mar 2013
Posts: 1,009
NY
So my th400 lost reverse so I am rebuilding it. I was running dex3h because I read online a few people had problems running dex6 and reverting back to dex3 solved them. Anyway because the transmission will be fresh should I run dex6? Any things I'm overlooking such as clutch compatibility or seal compatibility. It will have stock tan Borg Warner frictions. Thanks


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Can I run dex6 in my th400. [Re: joegreen] #4366159
03/28/17 10:57 PM
03/28/17 10:57 PM
Joined: May 2015
Posts: 378
NE US
PolarisX Offline
PolarisX  Offline

Joined: May 2015
Posts: 378
NE US
I'd run DEX6 only if you want the longer drain interval myself. Considering those have a kick down switch and obviously no computer control most of the shift timing and firmness comes from what you did in the rebuild.

I ran DEXIII H in my 200R, all the kick down and shift firmness was driven by the TV cable setup.

I have even seen guys swear by running TYPE F in those.

Last edited by PolarisX; 03/28/17 11:00 PM.

2017 Cruze LT/RS Hatchback 1.4T | Dealer | Dealer | Hankook Kinergy GT

2016.5 Cruze LT 1.4T | Dealer | Dealer | Continential Extreme Contract DWS06
Re: Can I run dex6 in my th400. [Re: joegreen] #4366191
03/28/17 11:47 PM
03/28/17 11:47 PM
Joined: Aug 2010
Posts: 12,916
Northern Kentucky
901Memphis Offline
901Memphis  Offline

Joined: Aug 2010
Posts: 12,916
Northern Kentucky
DexronVI has almost the same frictional properties as DexronIIIH but the starting viscosity is lower.

If the transmission is okay with lower shear stable fluids it should be fine but if you want a high viscosity synthetic replacement I would use my Mobil 1 ATF or Redline D4


2012 Chevy Cruze LT 1.4T - 62k - Edge 0w30 SL + Mahle OX401D
2002 Buick Century 147k - Built 4T65e(Maxlife) - GTX 5w30 + Fram XG3980
Re: Can I run dex6 in my th400. [Re: joegreen] #4366193
03/28/17 11:51 PM
03/28/17 11:51 PM
Joined: Jun 2002
Posts: 20,013
Iowegia - USA
MolaKule Offline
Global Moderator
MolaKule  Offline
Global Moderator

Joined: Jun 2002
Posts: 20,013
Iowegia - USA
Or, if you want a slightly thicker Dexron III type fluid you could use the Redline D4 or the Amsoil ATF.

Last edited by MolaKule; 03/28/17 11:52 PM.

Science is about objective reality, not consensus.
Re: Can I run dex6 in my th400. [Re: joegreen] #4366281
03/29/17 05:29 AM
03/29/17 05:29 AM
Joined: Mar 2013
Posts: 1,009
NY
joegreen Offline OP
joegreen  Offline OP

Joined: Mar 2013
Posts: 1,009
NY
Already used amsoil before and I really like it but this is an old plow truck that has seen 10,000 miles in the last 4-5 years. Basically looking for whatever is the cheapest that will work good.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Can I run dex6 in my th400. [Re: joegreen] #4366300
03/29/17 06:39 AM
03/29/17 06:39 AM
Joined: Dec 2013
Posts: 2,108
socal
barkingspider Offline
barkingspider  Offline

Joined: Dec 2013
Posts: 2,108
socal
Castrol transmax Dex/Merc is a very good fluid. It meets Dex3H


06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)
Re: Can I run dex6 in my th400. [Re: joegreen] #4366319
03/29/17 07:13 AM
03/29/17 07:13 AM
Joined: Sep 2004
Posts: 8,176
Marshfield , MA
andyd Offline
andyd  Offline

Joined: Sep 2004
Posts: 8,176
Marshfield , MA
Head for Wal Mart and find Super Tech Dex-Merc in gallons


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Can I run dex6 in my th400. [Re: andyd] #4366555
03/29/17 01:20 PM
03/29/17 01:20 PM
Joined: Feb 2013
Posts: 3,117
Virginia
bigt61 Offline
bigt61  Offline

Joined: Feb 2013
Posts: 3,117
Virginia
Originally Posted By: andyd
Head for Wal Mart and find Super Tech Dex-Merc in gallons
Agree


92 Suburban 2500 7.4L 58k M1_0w40 5yr OCI
99 Olds Aurora 4.0L 91K M1_5w30 5yr OCI
13 Dodge Dart 2.0L 30k PP 0w20 OLM OCI
70 Camaro 5.7L 59k
Re: Can I run dex6 in my th400. [Re: joegreen] #4366926
03/29/17 07:57 PM
03/29/17 07:57 PM
Joined: Dec 2013
Posts: 3,130
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline

Joined: Dec 2013
Posts: 3,130
Fort Worth, Texas
Originally Posted By: joegreen
So my th400 lost reverse so I am rebuilding it. I was running dex3h because I read online a few people had problems running dex6 and reverting back to dex3 solved them. Anyway because the transmission will be fresh should I run dex6? Any things I'm overlooking such as clutch compatibility or seal compatibility. It will have stock tan Borg Warner frictions. Thanks


On a rebuild with new seals, Dex VI will work fine.

If you need any help on the build let me know.....I know LOTS of tricks.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Can I run dex6 in my th400. [Re: clinebarger] #4366975
03/29/17 09:04 PM
03/29/17 09:04 PM
Joined: Mar 2013
Posts: 1,009
NY
joegreen Offline OP
joegreen  Offline OP

Joined: Mar 2013
Posts: 1,009
NY
Originally Posted By: clinebarger
Originally Posted By: joegreen
So my th400 lost reverse so I am rebuilding it. I was running dex3h because I read online a few people had problems running dex6 and reverting back to dex3 solved them. Anyway because the transmission will be fresh should I run dex6? Any things I'm overlooking such as clutch compatibility or seal compatibility. It will have stock tan Borg Warner frictions. Thanks


On a rebuild with new seals, Dex VI will work fine.

If you need any help on the build let me know.....I know LOTS of tricks.

Thanks. I'm just going to dual feed the direct clutches and make sure everything else is in spec per the atsg manual. If I have any questions ill let you know.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Can I run dex6 in my th400. [Re: bigt61] #4367315
03/30/17 10:34 AM
03/30/17 10:34 AM
Joined: Apr 2014
Posts: 849
SD - South Dakota
meborder Offline
meborder  Offline

Joined: Apr 2014
Posts: 849
SD - South Dakota
Originally Posted By: bigt61
Originally Posted By: andyd
Head for Wal Mart and find Super Tech Dex-Merc in gallons
Agree


agreed here as well.

I use Wal-Mart's Dex3 in my plow truck (700r4). it will serve you well.

I put a cheap drain plug on the pan and I drop 3-4 quarts every year or two.
A few years ago I syphoned out as much PS fluid as I could and used the Dex3 in there as well.

Mine doesn't see 100 miles an a year, and I don't think it's seen 1,000 miles since I bought it smile


Too many cars using too many different oils to list in 150 characters.
Re: Can I run dex6 in my th400. [Re: joegreen] #4367747
03/30/17 07:09 PM
03/30/17 07:09 PM
Joined: Dec 2013
Posts: 3,130
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline

Joined: Dec 2013
Posts: 3,130
Fort Worth, Texas
Originally Posted By: joegreen

Thanks. I'm just going to dual feed the direct clutches and make sure everything else is in spec per the atsg manual. If I have any questions ill let you know.


I wouldn't dual feed the directs on a plow truck, It only increases clamping force in third gear & actually slows reverse apply which is not good for plow duty. This is a high performance mod not a heavy duty mod.

ATSG manuals don't cover Front to Rear Carrier (Planet) end-play, Spec is .008"-.015".
Install the output shaft in a vice like shown & assemble up to the center support, While holding down the center support, Lift up on the front carrier like shown.....This is your end-play, Use these shims under the thrust washer that sits between the 2 carriers...... End Play Shims
You can also use these shims to set "Rear Unit End-Play" by using them on top of the 4-tang thrust washer at the output shaft.(IF you don't "Rollerize" the output shaft!)





Last edited by clinebarger; 03/30/17 07:10 PM.

2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Can I run dex6 in my th400. [Re: meborder] #4367808
03/30/17 08:14 PM
03/30/17 08:14 PM
Joined: Dec 2013
Posts: 3,130
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline

Joined: Dec 2013
Posts: 3,130
Fort Worth, Texas
I do recommend "rollerizing" between the output shaft & case, This will eliminate the 4-tang thrust washer & 3-tab selective washer & a lot of friction.

You will need.....
TH350 Pump to Direct Drum torrington bearing.
TH350 front end-play shims.
'91-'96 4L80E Pump Bushing.

Measure the thickness of the original Selective & Thrust Washer when stacked together with a caliper, This measurement will be used for 2 purposes....
1. This will give a calculation for the Maximum amount the Case Bushing can protrude above the back of the Case.
2. Starting point for setting Rear unit End-play, Add .010"-.020" to the measurement & start there with the Bearing & Shims. Let's say the original selective & thrust measures .140", Start with the Bearing & Shims at .150" to .160" thick.

A 4L80E Pump Bushing is twice as wide as a TH400 Case Bushing, Giving better support & you can leave it protruding out of the case to center the Bearing, Again let's say your original selective & thrust measured out at .140", Leave the bushing protruding .120"-.130" (.010"-.020" less) to clear the radius on the output shaft & provide adequate lubrication to the bearing.
Set Rear Unit End-Play to .005"-.010", With the bearing.....You can run tighter end-play than factory spec!

The first pic is of the TH350 pump bearing & Shims (TOP), & original TH400 selective & thrust (BOTTOM).

Second is comparing a 4L80E pump bushing to a TH400/4L80E case bushing.

Third is of a 4L80E Pump Bushing installed in place of the original Case Bushing, Shims....Then Bearing.
I was test fitting the bearing to make sure I didn't "Bell" the bushing.....Black side goes DOWN during final assembly!!!!

Forth is checking rear end-play on a 4L80E, Same procedure on a TH400. Set the dial indicator to zero & lift up on the output to check.









2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Can I run dex6 in my th400. [Re: joegreen] #4367914
03/30/17 10:07 PM
03/30/17 10:07 PM
Joined: Mar 2013
Posts: 1,009
NY
joegreen Offline OP
joegreen  Offline OP

Joined: Mar 2013
Posts: 1,009
NY
So I managed to save 8 quarts of the old ATF. Can i strain it out really well and reuse it? The fluid is not that old and doesn't have alot of miles on it. Also trans temps never get much higher than 200f when plowing.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Can I run dex6 in my th400. [Re: joegreen] #4367924
03/30/17 10:22 PM
03/30/17 10:22 PM
Joined: Mar 2013
Posts: 1,009
NY
joegreen Offline OP
joegreen  Offline OP

Joined: Mar 2013
Posts: 1,009
NY
The truck is not a dedicated plow truck it's my daily driver. I only plow a few driveways when it snows. Everywhere I read that the dual feed mod is good. What are some reasons I shouldn't do it?


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
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