T-5 Fluid Question? - JeepForum.com
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post #1 of 79 Old 12-26-2013, 12:04 PM Thread Starter
SouthernGypsy
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T-5 Fluid Question?

I know this has been brought up before, I just read an (old) thread where everyone was bickering over it. Since then has anyone came to a solid conclusion on what to use in your T-5 trannys? I was planning on changing my fluid this evening and was going to go to the store and pick up the proper stuff here in a couple of hours, IF, I know what the proper stuff is.


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post #2 of 79 Old 12-26-2013, 12:11 PM
LumpyGrits
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Any 75W-90 syn gear oil, will do nicely.
DO NOT use ATF, or std 'dino' gear oil.
BTW: That picture is NOT the transmission. It's your Dana 300 t'case.
LG

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post #3 of 79 Old 12-26-2013, 12:19 PM Thread Starter
SouthernGypsy
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Quote:
Originally Posted by LumpyGrits View Post
Any 75W-80 syn gear oil, will do nicely.
DO NOT use ATF, or std 'dino' gear oil.
BTW: That picture is NOT the transmission. It's your Dana 300 t'case.
LG

Yea, I realized after I posted it that you can't see the tranny. I thought you could see both when I picked the picture in the little selection window I was looking again even as you was answering me and apparently none of the pics I took that night show the tranny hardly at all. I was actually taking pics of the transfer case for a different thread but had thought I'd also captured the tranny in a couple of them but hadn't, so just removed the picture.


Well, 75W-80 is what I topped it off with but it wasn't Synthetic, I had read a bunch of people talking about Syncromesh but also in that old old thread seemed to be in an argument anyway and I was wondering if anyone ever came to a conscious.

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post #4 of 79 Old 12-26-2013, 01:02 PM
LumpyGrits
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I use only, Valvoline 75W-90 syn in my T-5.
LG

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post #5 of 79 Old 12-26-2013, 06:31 PM Thread Starter
SouthernGypsy
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Is the Pennzoil Synchromesh that so many people often seem to recommend a synthetic?

I looked at the store and noticed that it doesn't even have any weight markings on the bottle at all.

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post #6 of 79 Old 12-26-2013, 07:31 PM
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I put 75w90 syn valvoline after listening to LG in mine and no issues yet
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post #7 of 79 Old 12-26-2013, 07:42 PM Thread Starter
SouthernGypsy
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Well I had left for town before getting the first responses (could only wait so long once she was ready which was much faster than expected) and knew people had suggested the Syncromesh, so I got three bottles, only $4.19 each so no big deal. The stuff feels very thin to me and now that I put it in I defiantly do not care for it.... I am grinding the gears almost every time I go into reverse now and it's never done that before ...and this is on a tranny that was rebuilt just two years ago.

Was probably good to flush it with anyway, but for the price and how easy it is to change I'm gonna get something different tomorrow and put in it. Probably the 75w90 Synthetic Valvoline several people in this thread have recommended, I use Valvoline Durablend semi-synthetic in my 1971 'Cuda's pistol-grip 4 speed and it's always worked great so no big deal to pick up some of the full-synthetic version of it.

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post #8 of 79 Old 12-26-2013, 11:00 PM
NateC
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I noticed a distinct improvement (no more grinding or fighting into gear) when I started using BG Products Synchro Shift II. It is a synthetic 75W-80. It is GL-4 so it should not cause any corrosion issues with brass synchronizers. I am using this in the T-5 transmission as well as the transfer case.
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post #9 of 79 Old 12-27-2013, 06:49 AM
Matt1981CJ7
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James,

I had the same experience with Synchromesh on my newly rebuilt T-19. I didn't care for it at all.

I flushed it and stuck standard 50W engine oil in. Much better.

Matt
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post #10 of 79 Old 12-27-2013, 06:58 AM
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The Synchromesh did just the opposite for me. Mine wouldn't shift right, grinding gears, and almost impossible to down shift. Put in the Synchromesh, and there was a definite improvement.

I eventually swapped in a T176, as I wanted the 4 speed.
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post #11 of 79 Old 12-27-2013, 07:25 AM
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I use 5-30 motor oil. It was recommended by a very experience manual transmission re-builder who has been rebuilding these transmissions for 30 years. I used to run ATF, however when the weather got below freezing it was very difficult to shift. Felt like molasses. After replacing it with 5-30 no more hard shifts. I have been running with 5-30 for 5 years and it shifts perfect every time!
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post #12 of 79 Old 12-27-2013, 08:40 AM
LumpyGrits
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Reverse is a non-scycho gear. It WILL 'grind' if you don't bump it in first or second before engaging "R".
LG

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post #13 of 79 Old 12-27-2013, 08:46 AM
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Quote:
Originally Posted by GeCJ7 View Post
I use 5-30 motor oil. It was recommended by a very experience manual transmission re-builder who has been rebuilding these transmissions for 30 years. I used to run ATF, however when the weather got below freezing it was very difficult to shift. Felt like molasses. After replacing it with 5-30 no more hard shifts. I have been running with 5-30 for 5 years and it shifts perfect every time!
The B-W T5 was never built for 5W-30 eng oil.
75W-90 syn tranny oil has never failed any T4-T5 that I know who has used it.
We see 'teens'-110* plus in temps hear. So I'll stick with what I know works.
I have 30K miles on my T5 that I rebuilt w/75W-90 Valvoline.

LG

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post #14 of 79 Old 12-27-2013, 09:36 AM
wm69
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I think this is the MOST conclusive effort I've seen on T5 fluid. Spankrjs took some original T5 fluid and sent it off for analysis......

I run 90W gear oil in mine and have since the mid 90's with no problems, but I only have 80k on the Jeep, so not like it's a high mileage transmission. I planned on putting some Redline MT90 in, but instead picked up a T176 to swap in.

http://www.cj-8.com/forum/showthread...crambler/page5

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post #15 of 79 Old 12-27-2013, 10:01 AM
LumpyGrits
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wm69-what are you calling "original T5 fluid"?
Is that the brown stinky sulfur laced oil that AMC sold? PN was 83000000.
I have several qts of this AMC stuff. I can assure you that in our current 35* temps, it is no ways the thickness of the 90w it's sitting next to on my self.
LG

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