T-5 transmission fluid

fastford3388 · May 27th, 2008, 02:20 AM

Hey guys! i'm putting a T-5 in my mustang and i'm wondering what fluid to use? I want to use some good stuff, preferably synthetic. My friend says GM synchromesh is really good in his dodge stealth. I was wondering if you guys had any experience with synthetic fluid and what is best? Mobil 1? B&M synthetic?

thanks

G.T. Rags · May 27th, 2008, 02:20 AM

royal purple

bullitt5576 · May 27th, 2008, 02:22 AM

royal purple is by far my favorite oil/lubricants

fastford3388 · May 27th, 2008, 02:46 AM

how many quarts do i need?

fastford3388 · May 27th, 2008, 02:58 AM

also, i've heard bad things about synthetics. something about it not having enough friction in order to mesh with the syncros making it harder on the synchros to shift. should i go synthetic? also, should i go dexron mercon or syncromesh? royal purple makes syncromax which is synthetic syncromesh.

e3sean · May 27th, 2008, 09:35 AM

get dexron III(3) or IV (4) with mercon you dont need a synthetic,and it will be exactly 3 quarts.

ryans88gt · May 27th, 2008, 11:45 AM

I've always had good luck with plain old D/M III. I've heard some guys use lightweight 30W synthethetic gear oil for track only use, but I have never tried it.

fastford3388 · May 27th, 2008, 11:45 AM

i know ford recommends dexron/mercon but i wanted to put some better stuff. Has anyone used syncromesh from GM? my buddy uses it in his AWD Stealth and he says stealth guys swear by this stuff. I'm just curious because i want to put the best stuff in my transmission. something a little better than regular dexron/mercon

ryans88gt · May 27th, 2008, 11:56 AM

No, use D/M III.

Using other stuff will not be better, it will be a quick route to a rebuild.

Hasselm8 · May 27th, 2008, 12:19 PM

Originally Posted by 96GTRagTop

royal purple

+1

nolife · May 27th, 2008, 02:17 PM

Originally Posted by fastford3388

i know ford recommends dexron/mercon but i wanted to put some better stuff. Has anyone used syncromesh from GM? my buddy uses it in his AWD Stealth and he says stealth guys swear by this stuff. I'm just curious because i want to put the best stuff in my transmission. something a little better than regular dexron/mercon

What would make Syncromesh "better" in a T5 and what is wrong with dexron/mercon? They are two different fluids with different characteristics. Maybe one is better then the other but I personally would not switch without some actual evidence or at least a theory of why one was better than the other in the T5. I did see that Amsoil suggests their version of Syncromesh can be used in a T5 although they make no claims of it being better in a T5 or that it is a replacement for Mercon/Dexron, only that it would be easier for the retailers to stock only Sycromesh instead of a bunch of different types of transmissions fliuds.

AMSOIL Manual Synchromesh Transmission fluid is a versatile transmission lubricant. It reduces inventory needs, is readily available and is cost effective compared to vehicle manufacturer branded products.
Recommended for automotive and light truck applications that require synchromesh transmission fluid. Applications include manual transmissions and transaxles such as New Venture NV T350, NV 1500, NV 2550, NV 3500, NV 3550, NV 5600, and Tremec T4, T5, T18, T56, T176, TKO500, TKO600, TR 3450 and TR 3550. Replaces MTF-94 fluid for Land Rover, MG, and Mini Cooper. Replaces Honda Genuine MTF fluid for manual transaxles and Texaco MTX fluid.

e3sean · May 27th, 2008, 09:31 PM

i would use AMSOIL but thats cause my buddy is a dealer and i get it cheap but for something like that i would use what ford says to use.

nolife · May 27th, 2008, 10:14 PM

I use Castrol brand Dexron myself, the Amsoil site was the first one I found that mentioned any comparison or reference to a T5.

Iownastang · May 27th, 2008, 10:51 PM

I was thinking of buying vavoline dexron mercon atf for mine

terribleonexx88 · May 27th, 2008, 11:54 PM

i put mobil 1 synthetic in mine and if i flog it in 1st i rele have to slam second or ill miss it would the synthetic fluid make it harder to shift.

fastford3388 · May 30th, 2008, 04:34 PM

Originally Posted by terribleonexx88

i put mobil 1 synthetic in mine and if i flog it in 1st i rele have to slam second or ill miss it would the synthetic fluid make it harder to shift.

thats a good question. anyone know? I ended up getting schaffers (sp?) synthetic dex/mer III oil. they guy at the speed shop said its completely un-advertized and they've been around since mid 1800's. He said the fastest guys around put that stuff in their trans and its the only stuff that holds up.

anyone used it? should i stay away from synthetic?

ryans88gt · May 30th, 2008, 04:36 PM

I've heard of people putting a light weight synthetic gear oil in their T5s for drag race use only. If drag race use only sounds like what you use your car for, then go ahead and try it. If not, stick with Dex III, if it aint broke don't fix it.

fastford3388 · May 30th, 2008, 04:51 PM

yeah this stuff is dexron mecron III its not lightweight gear oil but would the synthetic oil make a huge difference if it's a street/strip car? is it gonna be ok? I don't want drivability issues but i want good performance from my fluid. its just regular dexron mercon synthetic stuff

e3sean · May 30th, 2008, 04:55 PM

Originally Posted by terribleonexx88

i put mobil 1 synthetic in mine and if i flog it in 1st i rele have to slam second or ill miss it would the synthetic fluid make it harder to shift.

it could. remember syncros work on friction. they need to be able to make 2 gears turning at differnt speeds to the same speed in a fraction of a second if it cant get that grip it will grind into gear. thats why old non world class t-5's use gear lube cause they were all brass but now they are fiber and carbon backed so they have to be able to grab smoothly.

Arctic Fox · May 31st, 2008, 08:24 AM

Redline MTL

May 27th, 2008, 02:20 AM	#1
fastford3388 Regular 1991 Mustang GT Join Date: Feb 2007 Location: Lisle, IL Posts: 367 iTrader: 0 reviews	T-5 transmission fluid Hey guys! i'm putting a T-5 in my mustang and i'm wondering what fluid to use? I want to use some good stuff, preferably synthetic. My friend says GM synchromesh is really good in his dodge stealth. I was wondering if you guys had any experience with synthetic fluid and what is best? Mobil 1? B&M synthetic? thanks __________________ - '90 Mustang LX-Sold "Debbie" - '89 Mustang GT- Deceased "Lucy" - '91 Mustang GT-70,000 mi "The Unicorn"

May 27th, 2008, 02:22 AM	#3
bullitt5576 Regular 2001 Bullitt Join Date: May 2008 Location: Oklahoma City Posts: 414 iTrader: 0 reviews	royal purple is by far my favorite oil/lubricants __________________ MM NEW EDGE COBRA CREW #2

May 27th, 2008, 02:46 AM	#4
fastford3388 Regular 1991 Mustang GT Join Date: Feb 2007 Location: Lisle, IL Posts: 367 iTrader: 0 reviews	how many quarts do i need? __________________ - '90 Mustang LX-Sold "Debbie" - '89 Mustang GT- Deceased "Lucy" - '91 Mustang GT-70,000 mi "The Unicorn"

May 27th, 2008, 02:58 AM	#5
fastford3388 Regular 1991 Mustang GT Join Date: Feb 2007 Location: Lisle, IL Posts: 367 iTrader: 0 reviews	also, i've heard bad things about synthetics. something about it not having enough friction in order to mesh with the syncros making it harder on the synchros to shift. should i go synthetic? also, should i go dexron mercon or syncromesh? royal purple makes syncromax which is synthetic syncromesh. __________________ - '90 Mustang LX-Sold "Debbie" - '89 Mustang GT- Deceased "Lucy" - '91 Mustang GT-70,000 mi "The Unicorn"

May 27th, 2008, 09:35 AM	#6
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	get dexron III(3) or IV (4) with mercon you dont need a synthetic,and it will be exactly 3 quarts. __________________

May 27th, 2008, 11:45 AM	#7
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	I've always had good luck with plain old D/M III. I've heard some guys use lightweight 30W synthethetic gear oil for track only use, but I have never tried it. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

May 27th, 2008, 11:56 AM	#9
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	No, use D/M III. Using other stuff will not be better, it will be a quick route to a rebuild. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

May 27th, 2008, 09:31 PM	#12
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	i would use AMSOIL but thats cause my buddy is a dealer and i get it cheap but for something like that i would use what ford says to use. __________________

May 27th, 2008, 10:14 PM	#13
nolife MM Fanatic 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 3,057 Blog Entries: 3 iTrader: 0 reviews	I use Castrol brand Dexron myself, the Amsoil site was the first one I found that mentioned any comparison or reference to a T5. __________________

May 27th, 2008, 10:51 PM	#14
Iownastang I Post Entirely Way Too Much 1987 ford mustang gt well see when shes done Join Date: May 2007 Location: mascot, tn Posts: 5,020 iTrader: 0 reviews	I was thinking of buying vavoline dexron mercon atf for mine

May 27th, 2008, 11:54 PM	#15
terribleonexx88 Enthusiast Join Date: Oct 2006 Location: new england Posts: 822 iTrader: 0 reviews	i put mobil 1 synthetic in mine and if i flog it in 1st i rele have to slam second or ill miss it would the synthetic fluid make it harder to shift. __________________ 85 svo. work in progress

May 30th, 2008, 04:36 PM	#17
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	I've heard of people putting a light weight synthetic gear oil in their T5s for drag race use only. If drag race use only sounds like what you use your car for, then go ahead and try it. If not, stick with Dex III, if it aint broke don't fix it. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

May 30th, 2008, 04:51 PM	#18
fastford3388 Regular 1991 Mustang GT Join Date: Feb 2007 Location: Lisle, IL Posts: 367 iTrader: 0 reviews	yeah this stuff is dexron mecron III its not lightweight gear oil but would the synthetic oil make a huge difference if it's a street/strip car? is it gonna be ok? I don't want drivability issues but i want good performance from my fluid. its just regular dexron mercon synthetic stuff __________________ - '90 Mustang LX-Sold "Debbie" - '89 Mustang GT- Deceased "Lucy" - '91 Mustang GT-70,000 mi "The Unicorn"

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