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Royal Purple Synchromax Manual Transmission Fluid

Market Price $25.99 You Save 12% ($3.00)
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FREE Shipping on orders over $49
  • Item 45004
  • MPN# 1512

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Features & Details

  • Smoother Shifts
  • Better Transmission Performance
  • Superior Protection
  • Full Synthetic
  • Resists Breakdown
  • 1-Quart Bottle
Protection. Royal Purple Synchromax® is a full synthetic transmission fluid that provides superior wear protection for your Mustang's drivetrain. Synchromax® is formulated with Royal Purple's synthetic, proprietary Synerlec® additive technology, which offers improved shift quality over a wide temperature range and reduced gear noise. Use Royal Purple Synchromax on your Mustang's next fluid change for the cheapest insurance you can get against future transmission breakdowns.

Better Shifts. If your transmission is notchy, rough, or loud but is mechanically fine, a fresh fill of Synchromax® can help smooth things back out. If you have a new Mustang or transmission, changing your fluid to Synchromax can keep your transmission working better - both now and later.

Protects Internal Components. Synchromax® is fully compatible with all types of friction materials and offers excellent corrosion and oxidation protection without affecting the soft metals commonly found in manual transmission synchronizers.

Application. Synchromax® is recommended for manual transmissions that specify an automatic transmission fluid or motor oil. Please note the T-45/T-3650 will take approximately 3.25 quarts to fill the transmission after a full transmission fluid flush.

Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Details

What's in the Box
  • (1) One Quart bottle
Installation Info
Tech Specs
Will it fit my Mustang?
  • Boss 302 - 12, 13
  • Foxbody - 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16, 17
  • Bullitt - 01, 08, 09
  • Cobra - 94, 95, 96, 97, 98, 99, 01, 03, 04, 93
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16, 17
  • GT500 - 07, 08, 09, 10, 11, 12, 13, 14
  • EcoBoost - 15, 16, 17

Fits manual transmissions

People Who Bought This Item Also Bought

Most Helpful Reviews

Good stuff

Awesome product, shifts a lot smoother. Pair this up with the applicable gasket to your transmission and you have the perfect excuse to hide in the garage from the wife and improve the drivability of ...

Read More
Helpful (27)

Royal Purple Synchromax

I have a 03 Mach 1 with a T-3650 and Ford sez 3.8 quarts of fluid, I put in 3.25 quarts and it was not full so I put all 4 quarts in and its just up to the fill hole. The Tranny shift real smoth now, great ...

Read More
Helpful (10)

Overall Rating 4.8 out of 5 stars
Read All 100+ Reviews

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28 Questions / 13 Answers

Ask a Question

how many quarts of transmission fluid do i need for my 1998 t-5 transmission?


  • you need 3 quarts. you can refer to your owners manual.


Show 2 more answers Helpful (5)

Is this safe for use in the MT82 2011+ GTs? Is this safe to use in the manual MT82 transmission for 2011+ GTs? I ask because I have heard its not good to change fluids outside of Motorcraft but I used this in my 01 GT and it made a huge difference in shift performance and I might have even picked up a few ponies


  • Yes this is safe to use. My local Ford dealer assured me it is great for performance enthusiasts.


Show 2 more answers Helpful (1)

Would this fix...? I'm long over due for a transmission fluid change and most likely going to buy this fluid, but I was wondering if this would fix a noise I have in 5th gear, (rubbing noise that is not constant but more of a lopping pattern noise) Keep up the awesome service AM!


  • This fluid will quiet down transmission noise to a degree. It really all depends on what's causing the noise. As long as it's not like a bad synchro or something to that effect it should help.


Show 4 more answers Helpful (1)

How many quarts for 01 bullit?


  • Ford recommends 4 quarts of transmission fluid for the TR3650 transmission in the 01 Bullitt


Helpful (0)

I have a 03 Mach 1 and was wondering how many quarts of royal purple to use and where I can find a filter if it needs one ?


  • The TR3650 transmission found in the Mach 1 requires 4 quarts of transmission fluid. Unfortunately we do not currently carry any filters, however, this is a component that should be available directly through Ford.


Helpful (0)

I have a 2017 GT, with MT82. Should I use the Motocraft XL-18 additive when I perform the fluid change?


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Customer Reviews (100+) Write a Review

Overall Rating 4.8

out of 5 stars

  • 5/5

    March 08, 2010

    Good stuff

    Awesome product, shifts a lot smoother. Pair this up with the applicable gasket to your transmission and you have the perfect excuse to hide in the garage from the wife and improve the drivability of your Stang.

    Oh For Pony

    Helpful (27)

  • 5/5

    November 14, 2009

    Royal Purple Synchromax

    I have a 03 Mach 1 with a T-3650 and Ford sez 3.8 quarts of fluid, I put in 3.25 quarts and it was not full so I put all 4 quarts in and its just up to the fill hole. The Tranny shift real smoth now, great improvement from the stock fulid.

    Doug Russell

    Year: 2003

    Helpful (10)

  • 5/5

    June 25, 2010


    before my shifter got scorching hot and shifting through gears required a little effort when tranny got warmed up, with synchromax paired up with the short shifter gasket set eliminated my hot shifter and now my tranny shifts smoothly i would deffinately reccomend this product to anyone

    Kolby Riley

    Helpful (9)

  • 5/5

    June 22, 2010

    great oil

    works great . the easiest way to refill your trans is to fill a suction gun up with royal purple trans fluid then push the oil out of the suction gun. into the fill hole . and always use rtv thread sealer on drain plug and fill plug thrads to insure no leaks.

    Tim Nelson

    Helpful (9)

  • 5/5

    August 08, 2011

    Shifts like hot butter

    I put some of this in at 70k it was definitely an improvement but it was also the first transmission fluid change. The improvement was noticeable but I can't say that it was from the royal purple and not from it just being fresh tranny fluid. I have a hurst shifter and with this fluid you can feel every single movement in the shift. I love it that way. I feel more connected like I know how the car is behaving. I would recommend this to anyone else.


    Year: 2006 Submodel: GT

    Helpful (6)

  • 5/5

    August 01, 2010


    Great product..I did notice smoother shifting..They say the trans holds 3.25 quarts..I bought 4..Should have bought 5..


    Helpful (6)

  • 5/5

    January 28, 2012

    Smooth Operation

    I have the new China made 6speed in my 2011 mustang and I tell you what it was very stiff going into gears cold and hot. This product helped out a lot. I would recommend this to anyone wanting to smooth out there transmission and also add better protection.


    Year: 2011 Submodel: GT Fuquay Varina, NC

    Helpful (5)

  • 5/5

    March 22, 2011

    cost be big time

    i had this put in my 98 gt, which was previously problem free and shifted smoothly with no grinds or pop outs.Less than 1,000 miles after using this my trans locked up with no warning. Techs at the transmission shop said that the failure was do to the use of Royal Purple, because it did not properly lubricate and caused excessive wear. cost me over $2,000 to get it rebuilt and reinstalled. now using Amsoil with no issues.


    Year: 1998 Submodel: GT

    Helpful (5)

  • 5/5

    June 08, 2010

    oyal Purple Synchromax

    well i totally noticed the smooth shifting thats what i enjoyed the most great stuff.


    Helpful (5)

  • 5/5

    December 13, 2009

    Awesome Lubricant

    This stuff is fantastic! I just put 3.2 QTS of it in my TR3650 and the notchiness has virtually gone away. Not only that, but AM has the best price around; a full $6.00/QT less than my local Pep Boys! AM and RP rock!

    David Forman

    Helpful (4)

  • 5/5

    June 06, 2008

    Purple Syncromax

    Elete transmission fluid for the 3650 Tremec, makes for very smooth shifting and quiet operation of tranny. The price per qt. at American Muscle beats them all!


    Helpful (4)

  • 5/5

    February 17, 2013


    Great product. Smooth shifts. Would highly recommend this product.


    Year: 2002 Submodel: GT McKinney, Texas

    Helpful (3)

  • 5/5

    November 29, 2012

    TR3650 Second Gear Hitch

    I have a 08 GT, with pretty much every bolt on there is, bought it new, and it has always had a hitch (a little difficult) going into second. Just changed to RP Synchromax, and what a difference, this oil really made a difference. Hitch completely gone, yes, gone, and all other gears are smooth as silk. I have to tell you, if you haven't changed you Tranny oil, you are really missing out on a quality upgrade. Banging second gear with confidence now, and yes, it has had the Tri-Ax since almost new. Worth every penny boys and girls.


    Year: 2008 Submodel: GT Jacksonville, FL, USA

    Helpful (3)

  • 5/5

    August 09, 2012


    Made shifting smoother overall and improved but did not really any performance gain. Had to put in a little more than 3.2 quarts in order for it to be full. I just bought a pump with two pipes that sucks in from one pipe and comes out for the other pipe that way I put one in the fluid bottle and one in the fill plug and kept pumping in.


    Year: 2010 Submodel: GT Chicago, IL

    Helpful (3)

  • 5/5

    November 19, 2015

    Good protection, worth the money.

    I really like this product. Had my local transmission shop put this in my car, and it really helps. Shifts are a bit smoother and the whole thing is quieter, but improvements are rather small in that area. Where this REALLY shines is on cold mornings. In the past, you had to wait for the transmission to "warm up" before it would shift well. Until then, shifts would be jerky, and the transmission would not want to go into gear; basically, it would just be very 'defiant' for the first 5-10 minutes, and this was only on 45 degree mornings, can't imagine how bad it would be if I lived somewhere where it got REALLY cold. After switching to this, however, this issue no longer arises. Plus, its Royal Purple, so you know it's good not just now, but in the long run for the health of your tranny. Well worth the price!


    Year: 2012 Submodel: GT Azle, TX

    Helpful (2)

  • 5/5

    November 29, 2012


    Did no think i was going to get results like i did. I had my doubts but changed my mind as soon as I started driving. Smoother shifts than Micron. I will be switching to ro yal purple from now on. Well worth the money.


    Year: 2010 Submodel: GT Spring, TX, USA

    Helpful (2)

  • 4/5

    November 22, 2012


    i was having a grind everytime i would throw it into 3rd gear and aftee changing the fluid its 90% gone! pretty much puts itself into gear now!!


    Year: 2002 Submodel: GT California, USA

    Helpful (2)

  • 5/5

    September 28, 2012

    stopped car from grinding!!

    car started to pop out of gear and did alot of grinding i have benn running this for a couple of months now problem solved switching all fluids to royal purple now!


    Year: 2004 Submodel: GT Clinton ct

    Helpful (2)

  • 5/5

    September 24, 2011

    keeps the tranny cooler

    I installed the royal purple when i put a new steda shifter , clucth cable kit with new quadrant and fire wall adjuster. The shifting is awesome now and because of the royal purple i can tell my trans is staying cooler. I also had a little sycro noise in 3rd and 4th , but after several weeks use its gone away. though i did need 4 quarts and ordered them accordingly after reading the other reviews. thanks american muscle


    Year: 1989 Submodel: Other michigan

    Helpful (2)

  • 5/5

    September 20, 2011

    much better shiffiting now

    Shifts a lot more smooth now. Even seems to have reduced the minor vibration problems i had at high r.p.m.'s. Filled it through the top from shifter while leaving the fill plug open and it made life so much more easy on me. Put the shifter back on with the Shifter Base & Handle Gasket that here has and lo and behold, no leaks. The only mistake I made was I forgot the T5's take about a Qt. less than the T45's, so now I have an extra Qt. sitting in the tool box. Remember people, do it your self means DO YOUR RESEARCH before you even think about buying the parts you need/want. Would recommend this to anyone.


    Year: 1999 Submodel: V6 El Monte, CA

    Helpful (2)