Best manual tranny fluid?

[StandBackImaPro]

What should i Get

I want somthing that basically restores the gears,synchros, etc, somthing for older transmissions ( one with 107k miles)

Somthing that best improves shifting, stops grinding, etc

i was stuck between these

BG synchro shift, redline manual tranny fluid, synergyn syngear II

They al say the same stuff, but which one has anyone had experience with?

Like if ## car was hard to get into a gear, or it grinded, what fluid did u put in that stopped it?

or which fluid did u notice made a difference over the oem fluid

 

[1fastlaser]

Ok after being though different trans fluids, breaking trans and everything else this is my opinion. Ive ran a bg/redline heavy weight shock proof combo..alittle expensive works ok.

Ive recently been running the autozone coastal 75-90w 80-90w gear oil. No problems shifts like butter at 8500rpms, when i drained it color was like it was brand new 1000 miles later.

When i put the trans back in with my twin disk, im acually looking into using a gm trans fluid. Chrysler and dodge use the same fluid. Its a GL4 based synthetic fluid. goes for about 11 a quart, They say its called castrol syntorq

Do a search on castrol syntorq on evolutionm.net or on yahoo. Sounds pretty damn good.
Im putting it in my evo mr trans. If there is guys with 4500 dollars trans doing it ill trust them since they are making some power.
I definatly liked the price and performance of the coastal.

Pennzoil syncromesh, ran it... I think with the abuse the fluid sucks period. Its too thin, and theres no way that stuff takes any kind of drivetrain shock

 

[talon187]

ive used pennzoil syncromesh and it works good but i just put some royal purple in there and it shifted even better then the pennzoil syncromesh its up to you but eaither of thoses are good

 

[gsxtasy]

Mitsubishi MR 6-speed gear oil, for evo's, get it at your dealer.

 

[1fastlaser]

Mitsubishi MR 6-speed gear oil, for evo's, get it at your dealer.

Yeah i know, But after alot of research, the gm/chrysler/dodge fluid is the same, Mitsubishi just like to take advantage of things

Im gonna run it in my mr, and gonna get some for my trans for the race car when i get it back. Cant wait to try out the twin disk.

 

[-TunedDSM-]

I too tried the Penzoil Syncromesh and absolutely hated it as it was very thin; It drained out like water. It made shifting a chore by making it feel notchy and full of resistance. After draining that out I tried Royal Purple 75w90 since it was available at my local NAPA. Needless to say, I have been running it ever since. Shifting is smooth and enjoyable, minimal resistance and notchy feeling. Just my two cents

 

[92awddsm]

I have a shep stage 3 tranny and run his reccomendation on fluid. I was advised to run a 50/50 mix of redline shockproof heavy and bg syncromesh(or synthetic equivilent). Seems to work great so far.

 

[T9S1i]

I use redline mtl or mt-90 per jon at TRE's suggestion. Cant complain about it the trans shifts great!

 

[gsxAWDdsm692]

BG Synchroshift II

 

[1fastlaser]

Everyone always has there own opinions, beliefs and what not. Even the big boys of tranny building. Im waiting for ams's blend to pop up because i know they have there recipe also.

If you dont have the cash coastal 75 90w is awesome for the price, even the 80 90w
If you do a search on here for "coastal trans fluid" or "coastal gear oil" Theres a pretty good post.

Im gonna be trying the castrol syntorq when i put my trans back in just because i can get it though an account we have at work cheap. Synthetic GL4

Ive ran pennzoil syncromesh, yeah it works, but I think its like 10w30 motor oil. Way to thin in my opinion for the stress our gear boxes take. If your grinding gear, theres something out of adjustment (clutch master adjusted too high or too low) clutch issues, or the trans needs some freshening up.

 

[gsxAWDdsm692]

What if your car is taking a while to go into gear? Like it takes longer then normal to go into gear from a change. Could this be because of a high idle?

 

[jking29]

Im waiting for ams's blend to pop up because i know they have there recipe also.

I am running the AMS suggested fluid. It is a 50/50 mix of BG Synchro and Redline Shockproof light. It is what they recommend for a trans with mileage on it. For a fresh trans their recommendation is the same as Shep's, a 50/50 mix of BG Synchro and Redline Shockproof heavy. I have got to say that with their recommended mix my trans shifts like butter.

 

[lilbro717]

Royal Purpe , the only fluids i use in my car

 

[5spdFTW]

/resurrect thread


i heard lots of DSMers crying "chrysler fluid only" for m/t and if they didnt use the factory fluid, they usually used a synthetic instead and seemed to be ok.

i also heard from a friend that worked at Jiffy Lube to be cautious when changing the tranny fluid in higher mileage trannys that havent had regular fluid flushes cause the buildup over time on the inside walls of the tranny would come loose when new fluid was put in and it would make it hard to shift gears or trash the tranny. this problem became so common that Jiffy lube stopped doin fluid flushes on higher mileage trannys without proof of regular changes. this may have been relating to auto-trannys only, im not sure.... anyone know if manual trannys have the same prob?

i bought a 95 talon n/t and i dont know the maintenence history and was doing regular maintenence stuff on it to be sure, would it be a good idea to change the fluid in my tranny? (100Kish mi) i dont grind gears but i do have problems getting into reverse, somtimes takes force and several tries.


just want to get it ready for winter.

 

[smithGSX]

i found that royal purple 75-90 and a half bottle of pennzoil synchromesh works amazing. my friends tranny has 274000 original miles on it and he has had the mix in there for a long ass time and it still works like new.

 

[codyw]

Ive tried penzoil syncromesh, BG syncroshift, Redline MT-90, and Valvoline 80-90. I think Redline works the best and I'll probably use it in all my tranny's from now on.

 

[DoyoFCT]

I use Amsoil... its the only gear that I have found that actually states it is GL-4 compliant.

+1 the Amsoil stuff blows away anything else i've tried. I've done the mixtures and all that crap. Honestly if you have an old high mileage trans use cheap coastol 75/90, but on a rebuild I can bet any good name brand synthetic will do the job. I prefer the amsoil stuff.

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[rock1t]

penzoil syncromesh... amazing shit like everyone else says

 

[Defiant]

/resurrect thread


i heard lots of DSMers crying "chrysler fluid only" for m/t and if they didnt use the factory fluid, they usually used a synthetic instead and seemed to be ok.

For the N/t -non-turbo- transmissions, you must use Chrysler fluid. Not doing so will destroy the "cardboard" (fibre) synchro brakes.

i also heard from a friend that worked at Jiffy Lube to be cautious when changing the tranny fluid in higher mileage trannys that havent had regular fluid flushes cause the buildup over time on the inside walls of the tranny would come loose when new fluid was put in and it would make it hard to shift gears or trash the tranny.

Well, Jiffy-Lube. Not really renown as the Piedmont of automotive intelligence. No, there is no "buildup" that will be loosened by fresh fluid, except in rare, rare cases of extreme transmission neglect. But that's how they sell flush jobs.

i bought a 95 talon n/t and i dont know the maintenence history and was doing regular maintenence stuff on it to be sure, would it be a good idea to change the fluid in my tranny? (100Kish mi) i dont grind gears but i do have problems getting into reverse, somtimes takes force and several tries.

Yes.

 

[5spdFTW]

thanks a lot Def.

 

[grantman10]

If Jon at TRE says syncromesh is too thin, i trust him. Go with Redline MTL.

 

[Drifte]

Might as well bring this thread back instead of make a new. I have been doing some research on different fluids. What reputable shop recommends what. So heres just some info I have come up with.

AMS high mileage trans: 50/50 mix of BG Synchro and Redline Shockproof light
AMS fresh trans: 50/50 mix of BG Synchro and Redline Shockproof heavy
Shep was also reported to recommend that combination but I haven't seen proof of that.
TRE: Against the idea of any shockproof use unless its a race only car. After several trans fluid changes the shockproof stuff will start to block oiling passeges inside the gearshafts.
link Recommended Transmission Oils- Team Rip Engineering

Differences of some of these fluids can be found at
Red Line Oil: Gear Lubricants.

After looking this over I intend to run a 50/50 mix of Redline MT-90 and MTL. I have a somewhat fresh transmission, all new bearings a few new gears. I can report back how that works, but I'm really not "hard" on my car so I dont plan to have any issues.

 

[Defiant]

I still can't believe that anyone is recommending that lubricants be mixed. Especially from different manufacturers.

Pick one, stick with it, and use it by itself.

 

[1997_GSX]

I used BG Syncroshift 2 and didn't like it at all. I bought Redline MT90 and love it.

 

[toofast82]

I have actually used the Coastal on a few high mileage trannies with good success as well as others i know. I believe its GL5 and I always felt weary about not using a GL4 but there were no issues. A friend of mine said my old 90gst was the smoothest shifting car hes ever driven and that tranny had 170k+
If i had a new or rebuilt unit, i would probably go with BG or MT90

 

[Drifte]

I still can't believe that anyone is recommending that lubricants be mixed. Especially from different manufacturers.

Pick one, stick with it, and use it by itself.

I was surprised too. But apparently the different weight oils are miscible, or they would recommend the combination, right? I have gone ahead and run just Royal Purple, but my new trans started leaking from the case...so $30 leaked onto the floor while it waited for my tranny guy to fix (still waiting).

Oh and I have noticed well maintained high mileage trannys do shift much smoother than ones with rebuilds or new synchros and things. New synchros require a break in and I have noticed are very notchy.