pav1

Hello friends at the Mustang Forums,

I'm doing some maintenance on a 92 Mustang and have a few questions.
What type of gear oil is used in the 5 spd manual transmission and 7.5 limited slip rear end? Do you use synthetic?
Should I use a stock thermostat on a stock motor, 192 deg?
Do you set your spark plug gap at .054?
Any info would be appreciated.

mjr46

dextron 3/mercon in the tranny
and unless it's a 4cyl you have an 8.8 not 7.5 if it's an 8.8 75w/90 with 4oz of friction modifier if it's a 4cyl 7.5 75w/90 = no friction modifier needed.......stock plug gap to .054 on 5.0 is fine as well as stock t-stat, some add a 180 t-stat for best overall cooling/performance.

yurizx6r

I use Red Line 75w90 on my rear axle with no additional friction modifier, and it works perfect. I use the recommended automatic transmission fluid (I think it's simply Castrol Dextron/Mercon) for my T-5. I use Mobil 1 10w-30 motor oil. Lucus "stop leak" for the power steering fluid even though it's a brand new pump (I use that to quite the damn pump and it works very well). For the spark plugs I gap them to .50-.52 with the simple NGK V-powered plugs. From what I read, it's better to put the old style plugs in there because the car was not designed for Iridium plugs, but do your own research and form your own opinion on that one. The coppers work fine for me, and I have never had a single issue with them.

I have also used both the stock 195 degree thermostat and the 180 degree thermostat. Both work just fine.

pav1

Thank you very much for the info and your time.

pav1

There's a sensor/sending unit that screws in to the top of the thermostat housing. Is this for the water temperature gauge or something the computer uses? What's the correct name for this part? Thanks again

yurizx6r

There shouldn't be anything that screws into the thermostat housing at all. There is the coolant temperature sensor (for the computer) that is on the heater core tube that is next to the thermostat housing.

If you do not have the heater core tube like me, then the coolant temperature sensor will sit next to the housing.

yurizx6r

See the brass fitting next to the thermostat? That is your coolant temperature sensor. I deleted my heater core tube, so I purchased this fitting for the coolant temperature sensor to sit on the intake. This is not that uncommon because people like me do not want to rip the dash apart to change a stupid heater core.

Whatever sensor you swap, ALWAYS swap them with Motorcraft. Don't waste your time or money putting something crappy like BWD on there. They will give you nothing but headaches. Do what you want, but I'd rather have the stuff that last for 20 years like the OEM Ford Motorcraft stuff on.

mjr46

if you lived in the north you would.....driving around with no heat here is not an option where as Florida you can get away with it.

yurizx6r

I think I've used my heat on my DD twice in 6 years, so yeah in Florida you do not need it. Up north...............sorry about your bad luck. lol

mjr46

nah, no bad luck....I can pull a heater core in a fox in 45 min if I hurry with a screw gun