World Class T5 transmission fluid

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Author Topic: World Class T5 transmission fluid  (Read 4919 times)

Offline AussiePhil

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World Class T5 transmission fluid
« on: June 15, 2020, 10:56:20 am »
Hi all, especially Shaunp and Bigal and the contributors of the initial post!
Found an old post (2013) about Borg Warner T5 WC transmission fluid last night in General chat!
Borg Warner (Now Tremec) advised in the day to use ATF Dextron ll.
But others now recommend a MTF as MTF's were not available at that time and are an EP oil.
I have the ex John Chapman 68 Mustang fitted with 89 Mustang GT engine and gearbox.
I've lost contact with John, I'm not sure who had it before John,  it used to have rego, PC689.
The gearbox is confirmed a world class by the part number 13-52-066-919 and torx head screw above reverse switch.
I only looked into the gearbox looking for the torque capability as on the dyno I have 520ft/lb.
Last night I panicked reading Borg Warner advised it should have ATF, because I knew it had gear oil in it!
I changed gear oil with gear oil when I bought the car a few years ago!
Currently have Penrite Progear 75W- 85 GL4 in it!
Shaunp and Bigal advised to use Valvoline Duragear 75W- 85 GL4.

I'm just checking if another product has come onto the market?

Thanks in advance for your comments and time.
Cheers Phil. 
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline Cob427

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Re: World Class T5 transmission fluid
« Reply #1 on: June 15, 2020, 03:51:50 pm »
I was advised by Mal Wood to use a mineral based gear oil...  Penrite  80w-90 mineral gear oil or something similar.
I believe that’s more geared towards the earlier non WC T5 transmissions or WC with the paper lined synchro rings.
I modified my WC T5 with carbon fibre synchros and now run Transmax Z.
You’ll probably get a number of different opinions on what to run no doubt.
Cheers
https://www.moderndriveline.com/the-many-different-faces-of-the-t5/
« Last Edit: June 15, 2020, 03:58:32 pm by Cob427 »

Offline AussiePhil

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Re: World Class T5 transmission fluid
« Reply #2 on: June 15, 2020, 04:15:53 pm »
Thanks Cob,

That one wasn't mentioned in the original post, Mal Wood certainly wood have an idea.
I'd love to know more about the gearbox, it may have already had something like that done as the car was a fresh build in 2008 if I remember correctly.
I couldn't discount it wasn't a mineral gear oil I emptied when I changed the oil before.
I'll put it on the list, it's not as if the cars going anywhere, I'm getting over a dirt bike accident!

Cheers Phil.
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline Cob427

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Re: World Class T5 transmission fluid
« Reply #3 on: June 15, 2020, 05:45:52 pm »
Cheers Phil
Had to sell my KTM 450 a while ago cos every time I’d do something stupid it would take longer and longer to peel myself off the ground. :thud:
Getting older sucks!

Offline AussiePhil

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Re: World Class T5 transmission fluid
« Reply #4 on: June 15, 2020, 05:54:11 pm »
Cheers Phil
Had to sell my KTM 450 a while ago cos every time I’d do something stupid it would take longer and longer to peel myself off the ground. :thud:
Getting older sucks!

I hear you! :omg:

Cheers Phil.
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!