Volvo 240 Rally build

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NoCoast
I thought T-5s used ATF.

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02-11-2008, 11:00 AM #20
iroc_zz
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Join Date: Jun 2007
Location: MN
Posts: 75
Car: 1985 IROC-Z
Engine: 305 H.O.
Transmission: 5 Speed
Axle/Gears: 7.5" 10 bolt, 4.10, torsen posi

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Re: T5 FAQ - Everything we know about the T5
I work at Zumbrota Bearing and Gear, a rebuild facility for manual transmissions and we recommend running ATF in all the rebuilt T5 transmissions that we sell.

I believe people get confused on what to put in the non-world class because each manufacture that used the non-world class transmissions (i.e. Ford, Chevy, AMC, and Nissan) recommended a different fluid. Ford and GM say to use ATF, AMC said to use 5W-30 motor oil and Nisasn said to use 80W-90 gear oil. All of the non-world class transmissions are basically the same internally so you should be able to use any of the three recommended fluids with out damaging the transmission. You will see better shifting quality when using ATF but it all comes down to personal choice on what you want to run.

We have found that running synthetic fluids in transmissions with brass synchronizer rings, like the non-world class, causes shifting problems over time. It seems like the synthetic fluids leave residue on the synchronizer rings and cones and does not allow the rings to grab the cones like they need to.

According to ZF the required fluid for the ZF6 is GM# 1052931 and is replaceable by Castrol Formula RS 10W60, the GM part number for synchromesh is 12345349. Amsoil recommends using their synchromesh part number MTF in place of both the 1052931 and 12345349 (it is a synthetic formulated 5W-30).

The o-ring you are looking for should be available at most part houses in the universal o-ring kits they offer. Just take your old one in to match up.
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Transmission Fluid
BorgWarner allowed each manufacturer to choose the lubricant for its particular application, but it seems that BorgWarner's recommendation was Dexron-II ATF from the very beginning. GM adopted the Dexron, as proven by the stickers placed on each transmission. Ford adopted Dexron as their official fluid, as proven by specifying the ATF product in their original 1983 and 1984 Field Service Manual publications. For some reason, AMC chose to continue specifying gear oil instead of ATF. The early style of Dexron is no longer available. Generic ATF such as DEX/MERC is a suitable substitute. A Ford dealer will recommend their Mercon-V ATF which is also a good substitute.

Many Internet sources insist that gear oil should be used in the Non-World Class T-5, but the documentation above clearly reveals that both Ford and GM chose to use ATF from the start. Using gear oil in a Non-World Class transmission will not significantly damage the transmission, but many times, due to Internet confusion as to what is, and is not, a World Class T-5, gear oil has been mistakenly used in the World Class units.

Update on Dexron VS Gear oil for NON-World Class T-5's:
Dexron-III ATF replaced Dexron-II in 1993. While Dexron-III meets or exceeds the previous specifications, the viscocity of Dexron-III is thinner than the original Dexron-II that was specified for the NON-World Class T-5. This thinner fluid is fine for the World Class T-5 with the lined synchro rings, but the NON-World Class T-5 with the brass synchro rings needs a thicker fluid to work optimally. As a result, Tremec has specified 30W MOTOR OIL for the NON-World Class T-5's. While Tremec has not published an official document about this, it is confirmed by an email dated 1/9/2012 from a Tremec Engineering/Support employee.

WARNING: Using gear oil or motor oil in a T-5 with the composite lined blocker rings found in the World Class T-5's will destroy the blocker ring linings over a period of a few months rendering those synchronizers useless.

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MattP
Are you going to be ready for PFR then?