Transmission Damage Due To Wrong Fluid

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frank@iupshot.com - 05 Nov 2007 17:31 GMT

Greetings!

Assuming that I have a WC T5, is it possible that the use of 70W gear
oil in the transmission could lead to transmission noise or damage? I
have noticed a particular noise from the transmission whenever the
vehicle is in motion above about 30 MPH. The vehicle is driven mostly
on highways and the noise started after a few months. Assuming I
replace the fluid with ATF and there is no damage might the noise go
away?

Thanks for your advice.
F

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Mike Romain - 05 Nov 2007 18:09 GMT

> Greetings!
>
[quoted text clipped - 8 lines]
> Thanks for your advice.
> F

My T5 can take either gear oil (summer) or ATF (winter), what it is
extremely picky on is the GL rating.

If I use a GL5 'compatible' gear oil, the syncros stop working after a
short while. If I then go back to a plain GL3, my T5 purrs again.

Mine is an older one in an 86 Jeep, The Borg Warner T5, not the WC one
with the plastic (I think).

I found some semi synthetic GL3 that is working well even in the real
cold (-40).

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08

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