transmission fluid for borg warner t4 - JeepForum.com
 8Likes
  • 4 Post By hodge5
  • 2 Post By keith460
  • 2 Post By Rtracy2001
 
LinkBack Thread Tools
post #1 of 6 Old 04-07-2020, 01:28 PM Thread Starter
Anderscj8
Registered User
 
Join Date: Oct 2019
Posts: 8
Garage
transmission fluid for borg warner t4

I have a cj8 with a 304 and a 4 speed borg warner. I need to change the trans fluid but I don't know what kind to use. What do you guys recommend?

Anderscj8 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 04-07-2020, 03:06 PM
hodge5
Registered User
 
hodge5's Avatar
1985 CJ7 
 
Join Date: Oct 2019
Posts: 40
I have a T5 in my 85. I changed mine back in the Winter, to Syncromesh. It made a HUGE difference- shifts much smoother, especially in the cold. Shifts were notchy before, and the cold affected downshifts quite a bit until the transmission warmed up. It had gear oil previously, although I don't know what weight. Regardless, I won't run anything other than Syncromesh, now.
hodge5 is online now  
post #3 of 6 Old 04-07-2020, 05:58 PM
uptillnow
Web Wheeler
 
uptillnow's Avatar
 
Join Date: Mar 2009
Location: Fountain Valley
Posts: 1,247
My neighbor has a T4 in his CJ. He claims very good performance from synthetic ATF from Red Line Oil.
https://www.redlineoil.com/d6-atf

UTN
uptillnow is offline  
 
post #4 of 6 Old 04-07-2020, 06:27 PM
oldschool74cj5
Registered User
 
Join Date: Jan 2017
Posts: 448
hello

i tried syncromesh but it did not shift well especially down shifting. im in 80F+ weather most of the year and only feels like a month of cool weather. i am running a 90w GL4 oil that i got from a truck shop that is used in tractor trailer automated manual transmission. a lot of research that the jeep T4 and T5 are a NON World version. mostly that means there is no fine roller bearings between the gears and the main shaft. Tremac who now makes the T5 transmission still recommends a gl4 oil for the non world version.

i would try different ones and see which works best for you.

oldschool
oldschool74cj5 is offline  
post #5 of 6 Old 04-07-2020, 06:28 PM
keith460
Web Wheeler
 
keith460's Avatar
1984 CJ7 
 
Join Date: Jan 2007
Location: Doylestown, PA
Posts: 8,726
I use Pennzoil Syncromesh as well in my T5 and had it in my previous T4 also. Good stuff and shifts are as smooth as butter at any temperature.
uptillnow and STJP like this.

.
1984 CJ-7 Renegade
__________________
keith460 is offline  
post #6 of 6 Old 04-07-2020, 06:44 PM
Rtracy2001
Registered User
1985 CJ7 
 
Join Date: Oct 2013
Location: Blackfoot
Posts: 296
Quote:
Originally Posted by Anderscj8 View Post
I have a cj8 with a 304 and a 4 speed borg warner. I need to change the trans fluid but I don't know what kind to use. What do you guys recommend?

You will find that this very question is a touchy topic. There are many opinions, conflicting manufacturer recommendations and sooner or later, someone will tell you "Use XX or it will ruin your transmission."

I can only speak from my personal experience with my CJ and my S-10 Blazer. When I bought my CJ (85 CJ-7 with the 151 4 cyl) it had 80W-90 in the T4. Most information seems to indicate that the Jeep CJs with the T4/T5 came from the factory with 80W-90 gear oil in the transmission. My 1985 S-10 Blazer had the exact same transmission as the CJ, but the factory installed Dexron II ATF (probably to get better fuel economy numbers). The Blazer transmission was a bit louder than the CJ, but I choked it up to the CJ having plenty of other noises to cover a little transmission noise. I tried Dexron III in both transmissions (mainly because Dexron II is no longer available) and both transmissions performed equally, though after changing to ATF in the CJ, the transmission noise became more apparent.

By this time I was working at an auto parts store and received a training on lubricants from a Pennzoil factory rep. The instructor talked about Synchromesh manual transmission fluid and how it had improved lubrication properties over ATF, was compatible with softer metals used as synchronizers in manual transmissions, (some gear oils are not) and was less viscous than gear oil, so it offered the potential for improved cold weather performance and fuel economy.

I decided to give it a shot in both the CJ and the Blazer. In both cases the transmissions were noticeably quieter than with ATF, and shifting was quicker/lighter than with gear oil in the CJ. I did not see a significant increase in fuel economy, but neither the CJ or the Blazer were really built for that. Cold weather shifting was significantly improved over gear oil and no worse than with ATF. I have continued to use the Syncromesh fluid in T4 transmissions and in the T5 when I "upgraded" the CJ.

It is a moot point now as I swapped an SM420 into the CJ and sold the Blazer, but my recommendation is the Synchromesh manual transmission fluid, YMMV.
uptillnow and STJP like this.

Every 20 minute job is just one broken bolt away from a three day ordeal.
Rtracy2001 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome