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Discussion Starter · #1 ·
I read to use regular ATF for 200-400 mile break in. Then drain and add GM syncrmesh fluid. Could I not use any good synthetic fluid like Mobil 1?
 

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Senior Charter Member
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I have Mobil 1 synthetic ATF in mine. Works great. I also used it when I had my Mustang and it made a word of difference, especially in the winter. I've never used the GM Syncromesh, just never had a reason to.
 

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FFCobra Craftsman
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I have Mobil 1 in the cobra and my beater '84 Escort. No problems. In fact, it fixed a "hard to shift when cold" problem in the Escort.
 

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Use Redline oil manual trans fluid. It is formulated to work with the lined synchros in the T5. My T5 shifts better now with the Redline than it ever did when new with the specified ATF. Plus according to numerous before/after dyno tests synthetics reduce friction and affectively give you more available rear wheel horsepower. How can you go wrong?
 

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Is the RedLine syn manual tranny fluid tha correct weight? Don't most(other than our T-5s)maual trannys take a heavy oil, closer to a rear end spec? Is there a RedLine ATF fluid?
I ask because I'll be putting my tranny back together this week and I havent bought the oil yet.
Thanks,
RR
 

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Rob

Get REDLINE MTL (Manual Transmission Lubricant). It's SAE 75W80 weight and is the correct fluid for T5's. Should be about $8 a quart. Don't use the ATF.

The Redline was reccommended to me by Bob Hanlon ( www.hanlonmotorsports.com ) who rebuilt my T5 and it has proven to be great stuff. If you visit Bob's website you'll see why he should know a thing or two about T5's (and Tremecs). If anyone needs transmission help with a T5 or Tremec I would highly reccommend Bob.
 

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Thanks Mike!
Yea , I'm familiar with Hanlon.
Can RedLine stuff be puchased at regular auto parts stores, or do they have distributors?
Thanks,
RR
 

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Discussion Starter · #8 ·
Thanks for the info guys.
 

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Venom Buster
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Originally posted by PUDDY:
I read to use regular ATF for 200-400 mile break in. Then drain and add GM syncrmesh fluid. Could I not use any good synthetic fluid like Mobil 1?
This is the exact instructions for the TREMEC transmission. NOT THE T-5. ALL T-5s use AUTOMATIC transmission fluid. Use of any heavy weight gear lube will destroy the T-5 transmission. The syncros, and the gears are designed to run automatic. Synthetic ATF is fine, but anybody running gear lube in a T-5 is doomed to future premature failure. I have seen stock T-5s go 200K miles with NO service and still work perfectly. It is all in the useage and driver shifting skills. T-5 syncros use "paper" or automatic tranny clutch material on the friction surface, and gear lube cannot penetrate it properly or protect it properly. This wears out the syncros in short order. Also, the gears are cut to use the light weight fluid, heavy fluid is not recomended. STEVE SIEGEL
 

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Originally posted by Mike Noyes:

Get REDLINE MTL (Manual Transmission Lubricant). It's SAE 75W80 weight and is the correct fluid for T5's. Should be about $8 a quart. Don't use the ATF.

THIS IS TOTALLY WRONG, and shouldnt have been posted. Gear lube will destroy a T-5. It was designed to run Automatic tranny fluid.
 

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FFCobra Fanatic
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I had read about problem running synthetic ATF due to the synchros being too slick. Nevertheless, I put Mobil1 ATF in my brand new T5 and it runs great. No problems with the synchros not spinning up. The T5 is a manual transmission designed to use ATF. The oil galleys are too restrictive to use anything heavier than ATF.
 

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Well, Well, Well.
Look who's honoring us with his presence!
If it isn't Mr. Siegel!
Nice to see you over here! Hope to see more of you.
RR
 

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Discussion Starter · #14 ·
Wow, thanks for the correction. You just saved me alot of problems. I'll use the mobil 1 synthetic that I already have.
 

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Sorry guys....But Redline MTF IS formulated to work with synchros with organic linings such as the T5. It has a friction modifier already blended in as a part of the oil.

I have had in in my T5 for over 75,000 miles in my Mustang before the Cobra and it works better than any other fluid I have tried. If you have a new trans and it's under warranty you'd better use the manufacturers recommended fluid or it may void you warranty otherwise I strongly recommend the Redline oil, or if not another synthetic that is suitable for the T5. The main thing to remember is that the synchros in the T5 have organic linings much like the clutch packs in the 8.8 traction loc rear end (or automatic trans). Regular gear lube will not work.
 
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