transmission and differential fluid? (5 speed, non turbo, rx7 fc 1987)
05-10-15, 05:59 AM
#2
Regular, good ol' gear oil, 75-w90 does the trick for both. Some of the better shops recommend Redline or Royal Purple, along with GM 's LSD additive if you have a Clutch-type Limited Slip Differential (86-88 only). IIRC, only GXLs and TII's have a LSD.
05-10-15, 09:29 AM
#3
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i like to mix about 50/50 gear oil and atf in the transmission in a street car, it acts like synthetic, but its cheap and easy to find.
05-10-15, 10:44 AM
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Unless you are Pounding the **** out of the car then the regular 75w90 or so will work just fine.
It's cheap and works.
Now if you want you can go Half and half with a Synthetic gear oil and a 75w90(which is really what they refer to as Semi-Synthetic) or Hop up to a full synthetic which in the long run smoothens out the "glitchy gears".
Honestly for a car that won't see the track or racing then just get something that works.Regular Gear oil.
On the rear diff you can add a "modifier" (Royal purple has it) If it is LSD.
If it's a "one wheel Peel" type diff then don't waste the money.
It's cheap and works.
Now if you want you can go Half and half with a Synthetic gear oil and a 75w90(which is really what they refer to as Semi-Synthetic) or Hop up to a full synthetic which in the long run smoothens out the "glitchy gears".
Honestly for a car that won't see the track or racing then just get something that works.Regular Gear oil.
On the rear diff you can add a "modifier" (Royal purple has it) If it is LSD.
If it's a "one wheel Peel" type diff then don't waste the money.
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