redline1991

1991 Mustang LX 5.0 std.
Going to try and change the transmission (std) fluid and rearend fluid tonight. Anyone have any step by step instructions on how to change these fluids...lol
And what fluid do I use meaning Brand and Weight, THANKS... :-)

88BlueGT

Royal Purple

LOUDexhaust

I'd also like to know how to change the trans fluid. I can't find where to put it in lol.

samseed101

I know this doesn't really answer your question... but if your tranny fluid is really bad off, maybe you should flush it instead of just dropping the pan and changing the fluid.

kevstang87

Well for a 5spd the fill and the drain is on the passenger side on the tranny. top is fill botom is drain.
For auto drop the pan and fill through dip stick. Here is a chart on the fill specs

Recommended Fuel
All except Cobra- unleaded 87+octane
Cobra- unleaded 91+ octane

Engine Coolant
50/50 mixture of ethylene glycol antifreeze and water

Brake Fluid
Dot 3 or Dot 4 brake fluid

Differential Lube
80W-90 Lubricant; for trak-lock axles: add 4oz of friction modifier when changing oil

Fluid Capacities

Oil Capacities
3.8L V6- 5qts
4.6L V8 (-1996)- 5qts
4.6L V8 (1997+)- 6qts
5.0L V8- 5qts

Fuel Capacity
15.4 gallons

Cooling System Capacities
V6- 11.8qts
V8- 14.1qts

Automatic Transmissions
AODE- 12.5qts
4R70W- V6- 13.9qts; V8- 12.8qts

Manual Transmissions
T5- 5.6qts
T45- 6.6qts

Rear Differential
7.5"- 3.25pts
8.8"- 3.75pts

Hope this helps. If this doesn't take it to your local garage

gspfunk

For the T5, buy 3 qts Mercon III ATF. The bottom plug (like was said above^^^^) is the drain plug. Drain it all out and put the bottom plug back in. Now take the top one out. If you have a pump then just run your hose into the top hole and fill it until it starts overflowing. If you don't have a pump, it's a lot easier to take the shifter off and pour it in there...just go slow so it has time to drain. When it comes out the fill hole, you're done.

I use Royal Purple 75w90 in the rear end. The rear end will also have a fill plug...if I remember correctly, it's on the driver's side at the top, kind of facing forward. You will want a pump b/c it's PITA otherwise (I know this from experience). To drain it, just loosen the bolts and pry the bottom of the diff cover off. Make sure you have a pan under it or it will make a huge mess.

redline1991

Thanks alot for the info.... :-)

Was talking to a friend of mine and this is what he said to put in... Let me know if that's the way to go...

RearEnd fluid - 75/140 Synthetic w/XL3 Friction Modifier
Std. Trans - Dextron 111Let me know as soon as you can, I plan to pick up the fluids in the next hr... thanks

7upedition

for the rear end you really only need a synthetic 75w90 gear oil w/ a friction additive, you'll use 3 qts, but before you drain the fluid in there be sure you can get the fill plug out or else you'll be drilling a hole to fill the rear diff back up.

gspfunk

Sorry, I just saw this... RP 75w90 is all you need for the rear end and it has friction modifier in it. The Dexron is the same thing as Mercon III.

redline1991

Thanks alot guys for all your help, Now I know. It's getting Fluids done tonight. Already changed the motor oil and antifreeze, cleaned and re-oiled K&N, greased the front wheel bearings, put new front springs in her, tinted the windows yesterday. Going to buff the paint, and headlights this weekend. The fun never stops....lol