This is topic GL5? in forum Tech Talk at Northern California Ford Owners .
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Posted by 90GT510 (Member # 9199) on
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I was wondering what type of transmission fluid to use in a 1990 5.0 T5 stock tranny
Posted by 89 306 (Member # 9042) on
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u could use that mercon stuff..but theres different ones u could get..redline trany fluid.or some royal purple..
Posted by Duncan Motors (Member # 7045) on
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gl5 is rearend oil t5 take automatic fluid
Posted by gercolla1 (Member # 3068) on
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use dextron/mercon III in all world class T5's and yes a 90 T5 is a world class.
Posted by 91fox (Member # 7842) on
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all world class T5's 85 and up use auto fluid dex/mercon 3 and NON world class T5's use gear oil
Posted by 90GT510 (Member # 9199) on
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I forgot to mention it is stick shift. does it matter?
Posted by Adam5.0 (Member # 6995) on
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quote:
Originally posted by 90GT510:
I forgot to mention it is stick shift. does it matter?
Oh boy. just take it to a shop
Posted by 1HaTCheD5LiTEr (Member # 8269) on
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T5s are sticks...AODs are automatics
Dex/merc III is what it takes but you can use anything up to Dex/Merc V
Posted by 91fox (Member # 7842) on
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quote:
Originally posted by 90GT510:
I forgot to mention it is stick shift. does it matter?
using auto fluid dex/merc III in your T5 stick shift is not a problem, thats what borgwarner (T5's original manufacturer)specifies to use in those manuel transmissions.
the reason to use auto fluid in a World Class T5 (thats what you have)is because they started using a thin caged needle bearing between the gears 1st-3rd to reduce friction. and to lubericate these bearings they switched from gear fluid which was too thick to flow inbetween the small bearings, to a thinner automatic trans fluid dex/mercon.
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