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zf5-s42 Fluid

 
  #1  
Old 05-13-2019, 03:54 PM
TJLongworth
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zf5-s42 Fluid

What is everyone running,

the internet seems to be all over the place, the most consistent Ive seen is synthetic mercron V.

I tow ALOT, and I know these transmissions get hot
 
  #2  
Old 05-13-2019, 06:53 PM
farmert
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Synthetic Mercron is what is called for. I used the plane old Mercron for a lot of miles with no problem in my 90 which has over 215k on it, on the original tranny. The 97 has 235K on it with synthetic Mercron the last 40k, which is the mileage on the replacement tranny. That tranny showed 190K on the clock in the parts truck.
 
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Old 05-13-2019, 07:46 PM
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97-psd
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I am running synthetic merc V. As you have seen, there are several options. Is this a rebuild or just changing the fluid?
 
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Old 05-14-2019, 07:31 AM
TJLongworth
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This is just a drain and refill,

do you remember what brand you used ?
 
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Old 05-14-2019, 08:39 AM
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As long as it meets spec, you will be fine. I ran mine to break it in after I rebuilt it on Super Tech ATF. Shifted fine, but was notchier when cold. Usually on the 2-3 shift. Shifted to Redlline D4, less notchy. Every German manual box I have stirred the gears in has been notchy, just how they are as far as I am concerned.

IMO, pull a PTO cover (or both) and install some rare earth flat, round magnets with 25-30lb pull. The only magnet in the damned case you cannot service. The fluid will stay cleaner longer.
 
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Old 05-14-2019, 09:01 AM
TJLongworth
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Alright cool, thanks everyone
 
  #7  
Old 05-14-2019, 10:39 AM
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OH

Fill from the top so you can add an extra quart. Seems that is pretty SOP to help with heat and gear noise. If you have the means, do the short shifter from Midwest. It is awesome, makes the throws much shorter. I have a core if you want to use it for the conversion, just send me yours back.

I also found a guy that makes a sleeve to attach aftermarket shift *****.
 
  #8  
Old 05-14-2019, 11:24 AM
BuddyBarnes
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I also found a guy that makes a sleeve to attach aftermarket shift *****.

Elaborate please. thanks
 
  #9  
Old 05-16-2019, 12:40 AM
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Originally Posted by Hit Man X View Post
As long as it meets spec, you will be fine. I ran mine to break it in after I rebuilt it on Super Tech ATF. Shifted fine, but was notchier when cold. Usually on the 2-3 shift. Shifted to Redlline D4, less notchy. Every German manual box I have stirred the gears in has been notchy, just how they are as far as I am concerned.

IMO, pull a PTO cover (or both) and install some rare earth flat, round magnets with 25-30lb pull. The only magnet in the damned case you cannot service. The fluid will stay cleaner longer.
When I installed the ZF in mine I also brazed a fitting on one of the PTO covers and used the transmission temp sensor I'd been using with the E4OD. And, I'm using Redline MTL 75W80. Redline said the only drawback might be notchy cold weather shifting, it shifts fine.
 

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