T5 Transmission fluid - JeepForum.com
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post #1 of 45 Old 12-26-2005, 05:51 PM Thread Starter
Hank86
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T5 Transmission fluid

I want to change the fluid in my T5 Transmission but it says to put part jeep manual transmission lubricant part no. 4874464). I have done alot of searching and there is alot of conflicting information . Some say to put 80w-90, some say ATF, and some say royal purple syncromax. Any T5 Transmission peeps wanna chime in on what there using.


86' CJ7 - 258 - Weber 32/36 Carb, T-5, 300 transfer case, Dana 44 rear w/ 3.31 Gears, 33" ProComp M/T on 15x10, with a 2" Body Lift, 1 1/4" shackle lift.


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post #2 of 45 Old 12-26-2005, 06:53 PM
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I ran a T5 for 4 years until the 360 swap. I always used, and was told to use, ATF, and I never had a problem. Good luck.
KB
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post #3 of 45 Old 12-26-2005, 06:59 PM Thread Starter
Hank86
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what type of ATF?

86' CJ7 - 258 - Weber 32/36 Carb, T-5, 300 transfer case, Dana 44 rear w/ 3.31 Gears, 33" ProComp M/T on 15x10, with a 2" Body Lift, 1 1/4" shackle lift.


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post #4 of 45 Old 12-26-2005, 09:00 PM
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I ran Dextron/MerconIII for many years with no problems either.

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post #5 of 45 Old 12-26-2005, 10:29 PM
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i run atf and don't see any problems so far...i hear the same thing, i was told the same thing so i decided to follow chiltons and see how atf worked for a while and i left it in because it did seem to be working...good luck!

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post #6 of 45 Old 12-27-2005, 01:34 AM
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To further add to the different answers.......When I got my rebuilt T-5 exchange, they said they would only warranty it if I used 10W40 motor oil.....so I did. Found out it shifted smoother, and ran great. The first one made all kinds of noise and was harder to shift with a life of 80K miles. I got 100K out of this one before I replaced the bearings (had front bearing go and replaced them all.....the rest were good though)...and it still shifts great and the gears are fine...I'm sticking to the 10W40 oil. I have never tried the ATF, so I don't know. I do change the oil in mine about every 40 to 50K.

Ed
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post #7 of 45 Old 12-27-2005, 08:22 AM Thread Starter
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Well I just cracked open the drain plug on the T5 Transmission and smelt the fluid. It's defineitly gear oil **cough**couch** sulpfur smell. So what do I do now? I think I will just replace it with 80W90 Thats what my T4 had in my 77 CJ5 this cant be that much different.

86' CJ7 - 258 - Weber 32/36 Carb, T-5, 300 transfer case, Dana 44 rear w/ 3.31 Gears, 33" ProComp M/T on 15x10, with a 2" Body Lift, 1 1/4" shackle lift.


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post #8 of 45 Old 12-27-2005, 08:41 AM
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Quote:
Originally Posted by Hank86
Well I just cracked open the drain plug on the T5 Transmission and smelt the fluid. It's defineitly gear oil **cough**couch** sulpfur smell. So what do I do now? I think I will just replace it with 80W90 Thats what my T4 had in my 77 CJ5 this cant be that much different.
sulfur bad. eats up the brass syncros. Dexron III/Mercon good.
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post #9 of 45 Old 12-27-2005, 12:19 PM Thread Starter
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So if I put Dexron III/Mercon in the T5 Transmission and put 80W-90 in the Dana 300 Transfer case the two won't mix?

86' CJ7 - 258 - Weber 32/36 Carb, T-5, 300 transfer case, Dana 44 rear w/ 3.31 Gears, 33" ProComp M/T on 15x10, with a 2" Body Lift, 1 1/4" shackle lift.


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post #10 of 45 Old 12-27-2005, 02:49 PM Thread Starter
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So there is no Brass Synchros for all the other Jeep Trannys from 1949 - 1986 because they specify gear oil. I am so confused.

86' CJ7 - 258 - Weber 32/36 Carb, T-5, 300 transfer case, Dana 44 rear w/ 3.31 Gears, 33" ProComp M/T on 15x10, with a 2" Body Lift, 1 1/4" shackle lift.


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post #11 of 45 Old 12-27-2005, 03:01 PM
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Quote:
Originally Posted by Hank86
So there is no Brass Synchros for all the other Jeep Trannys from 1949 - 1986 because they specify gear oil. I am so confused.
Uh, oh. I am getting old and stupid. The brass synchro comment applies to GL3 vs. GL5 argument that comes up ad nauseum. Those of course are gear oil. No real consensus on that topic either.

My son rebuilds T5s in his spare time. He uses DexIII/Mercon. Plenty of other people use 80/90 gear oil. Take your pick. Both have been listed in the various FSMs over time. When it breaks, blame it on the fluid, fix it and use the other stuff.
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post #12 of 45 Old 12-27-2005, 03:02 PM
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T-5 Fluid Verdict

I hope that I can shed some light and some helpful suggestions on the T-5 fluid debate. I built T-5 transmissions for years. T-5s and Tremec only. I used to race mustangs and they provided my bread and butter for many years. As everyone knows they are far from strong on high horsepower applications.

Regardless of what year T-5 you have, regardless of whether the blocking rings are brass or fiber 3-piece (WC style) you should be using synchromesh fluid. Aftermarket can be found here: http://www.pennzoil.com/products/gea...cro_fluid.html

and GM Part # 12345349

ATF is suggested otherwise if you'd prefer not to spend $7-10 a quart, NOT gear oil and NOT motor oil. I know they used to specify gear oil....IGNORE and use the synchromesh fluid. It's synthetic and an excellent lubricator for the T-5 transmission. I have even cured minor synchro grinding issues just by changing out the ATF. Transmissions that are difficult to shift using gear oil, will feel like new.

Hank, the transmission and the transfer case do not share fluid. However, I suggest using a synthetic gear oil in the Dana as I also do in the front and rear axles.

Just my .02 cents, but I'm speaking from a long line of experience building T-5s. I hope it helps you out.
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post #13 of 45 Old 12-27-2005, 03:24 PM Thread Starter
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Thanks Fredok I will follow your advice.

86' CJ7 - 258 - Weber 32/36 Carb, T-5, 300 transfer case, Dana 44 rear w/ 3.31 Gears, 33" ProComp M/T on 15x10, with a 2" Body Lift, 1 1/4" shackle lift.


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Last edited by Hank86; 12-27-2005 at 03:36 PM.
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post #14 of 45 Old 12-28-2005, 12:49 AM
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3 questions:
Will O'Rileys / Pepboys / Autozone, etc have Synchromesh Fluid ?
and not to push my luck, but why am I'm getting such good results with 10W40? It shifts smooth, no noise, was clean during inspection, and the trans rebuild shop swore by it....
I do like the looks of the Synchromesh Fluid though.
Will I have to flush the oil oil out or can the new synch fluid mix a little with the old 10W40 oil? I'm will soon be installing a Stroker 6 and will change / inspect then.....and yes, I know easy on the skinny pedal with the new horsee power. Thanks

Ed
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post #15 of 45 Old 12-28-2005, 06:55 AM
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...I know I posted previously on using DexIII/Mercon, but I DID use the Penzoil version of Syncromesh in an AX-5 in a YJ, based on other internet chatter elsewhere (JU). I got it at Autozone for about $5/qt. Wherever you find it, it'll be on a top shelf or bottom shelf or some other out of the way place, and will most likely be covered in dust. As soon as I put it in, some other guy posted that it shouldn't be used. (sigh)

I think you should listen to fredrok. He builds them for real.
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