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Old 06-09-2010, 04:57 PM   #1
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6 speed transmission fluid

my first post

ok so i have a 2005 wrangler 4.0L with the six speed transmission. I want to change the transmission fluid because im sure the previous owner did it and it has about 50k on it now and second is real ruff especially in colder weather. Ive read through the forum and most recommended the royal purple or the MT-90 for 5 speeds. I was wondering if its the same deal with the six speed the manual basically just tells me to use MOPAR.

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Old 06-09-2010, 08:10 PM   #2
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I also have a six speed in my tj and the move from first to second was extremely ruff when I purchased it (only had 15,000 miles) I took it to the dealer and they said some stuff, probably bs, about tolerances and that only manufacturer fluid will work. They changed it and it did make it noticeably better, though the transition is still noticeably more ruff than any of the other gear changes. I don't know if there was damage done or if it just an issue with these transmissions, but I am interested to hear what the others on here have to say.

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Old 06-09-2010, 08:18 PM   #3
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I have the same Jeep, same year and I recently changed mine at 38k. I wasn't sure it had ever been done because it was shifting a little rough. After much searching on here, I decided to go with Royal Purple Synchromax. I'm glad I did because it made a noticeable difference. Now, I can't say whether that is because of the brand or just the fact that it is fresh, but in any case, it's better and I'm happy. I'm not a Royal Purple freak or anything like that.

Quote:
Originally Posted by flint
I don't know if there was damage done or if it just an issue with these transmissions, but I am interested to hear what the others on here have to say.
If I had to pick one transition in mine that is rough, it's from 2nd into 3rd. It's not terrible, but definitely noticeable. 1st to 2nd is fine.
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Old 06-10-2010, 10:47 AM   #4
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bump
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Old 06-11-2010, 10:42 AM   #5
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well thanks for the advice. everyone seems to say that changing it makes some kind of improvement so im going to go ahead. going to try to find the purple up at auto zone this weekend
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Old 06-11-2010, 10:48 AM   #6
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I use Pennzoil - Synchromesh
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Old 08-10-2011, 09:38 PM   #7
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If you dont use Synchromesh it will trash your synchros
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Old 08-10-2011, 11:19 PM   #8
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i have an 05 mine is doing the same thing, i think i'm going to try the royal purple, anyone know how many quarts it takes.
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Old 08-11-2011, 06:34 AM   #9
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Quote:
Originally Posted by ggross View Post
i have an 05 mine is doing the same thing, i think i'm going to try the royal purple, anyone know how many quarts it takes.
1.58 quarts.
I got 2 bottles(2 qts) of the Royal purple Syncromax and it worked well. You'll want the extra half quart for spill/residual left in the suction gun.
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Old 08-11-2011, 06:52 AM   #10
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Thanks
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Old 08-11-2011, 07:38 AM   #11
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I used Amsoil Synchromesh in my '05 LJ 6-speed.
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Old 08-11-2011, 08:10 AM   #12
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Quote:
Originally Posted by blackjeepwrangler View Post
If you dont use Synchromesh it will trash your synchros
Sorry to disagree but you can also use Royal Purple Synchmax and Redline.. They meet Ms-9224 specs.. I personally use RP in mine and I can tell a slight difference in the shifting...
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Old 05-07-2013, 09:17 AM   #13
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The main issue is that the Wrangler I purchased has a 3 inch body lift kit and the shifter is hitting the plastic piece that holds the shifter boot cover on.
I took it off yesterday and trimmed the metal that is supposed to protect the plastic to give me the extra room to shift.
I am concerned that the 1st to 2nd syncro is already bad. It grinds a little and it does not feel smooth going into 2nd gear.
I had a similar issue with my S2000 and when I put the GM Synchromesh Friction Modified into that transmission, everything got better.
I have no problem rebuilding the transmission myself, rebuilt my 4 speed in my Cosworth Vega several times. I just don't want to have to do this to a vehicle with only 45000 miles on it.
I am also not looking forward to removing the transfer case and the transmission.

I just looked at the Royal Purple site and they suggest their Synchromax as a replacement, but the most interesting thing I noticed is that they also that they do not always recommend their fluids. They actually recommend the OEM products for some.
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Old 06-24-2013, 05:57 PM   #14
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Quote:
Originally Posted by Wench View Post
Sorry to disagree but you can also use Royal Purple Synchmax and Redline.. They meet Ms-9224 specs.. I personally use RP in mine and I can tell a slight difference in the shifting...
RP Synchmax is synchromesh and so is the Redline synchromesh so what exactly did you disagree with? Also, you state redline as if they are all the same and they are not.

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