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#1
12-29-2015, 01:15 PM
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69 Firebird four speed Muncie
This car is original with 104K and I have always had some problems getting it into second when it is cold. The lubricant that it calls for is 90 weight and I am wondering if Royal Purple would help. They make it in 75-90 weight and 90-145? Any suggestions on using Royal Purple and what weight would be best?
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#2
12-29-2015, 05:57 PM
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Only when it's cold? No other shifting issues when it's warmed up?
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Cholesterol Bad Adrenaline Good Do it till your eyes bug out! |
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#3
12-29-2015, 08:32 PM
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Yes it is always difficult when cold. Once the car warms up it shifts well with no issues.
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#4
12-29-2015, 08:40 PM
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I would not use a synthetic lubricant in your Muncie, it was not engineered and designed for such gear oil. The internal tolerances are designed for non synthetic. Tim john---
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#5
12-29-2015, 10:21 PM
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When was the last time you changed the gear lube? You could try changing to the lowest weight lube to see if it helps. It seems like your syncros are fine and your clutch is adjusted correctly, maybe the tolerances are tighter in the second gear until it warms up some.
__________________
Cholesterol Bad Adrenaline Good Do it till your eyes bug out! |
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#6
12-30-2015, 12:12 PM
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Be sure and use a GL-4 rated gear oil only for a Muncie. Oils that are rated for both GL-4/GL-5 or GL-5 only have sulfer and chlorine in them that will attack the brass parts in the trans. Sta-Lube makes an 85w-90 gear oil that is GL-4 rated for the old style manual trans. I have it in my supercase Muncie and it shifts great. Do a search, there is lots of info out there on the subject.
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#7
12-30-2015, 07:36 PM
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69 Firebird 4 speed Muncie
First let me say Thank You to Tim John, Sport69 and ANDYA for your replies to my question. I will go with STA-Lube 85W-90 and I was so glad to know about the corrosion factor. Changing the oil out will most likely help the shifting. Will keep you posted.
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#8
12-31-2015, 05:54 PM
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69 Firebird 4 speed Muncie
Can not believe that after five moves and 42 years I came across a can of GM 40 fl oz of Syncromesh Transmission Lubricant SAE 80 1#5729187 that I bought in 1973 for this 69 Firebird. It is completely sealed with a metal plug under the cap. As this transmission calls for 80 or 90 weight oil and 2 and 1/2 pints I will have to mix it with the Sta-Lube. Any thoughts?
Last edited by c.w. fields; 12-31-2015 at 05:56 PM. Reason: add car |
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#9
12-31-2015, 06:10 PM
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I would keep the GM oil in the can on a shelf for display as "garage art" and fill the trans with the Sta-Lube. The Sta-Lube has the correct rating and weight for your trans and is probably the same quality as the GM stuff.
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#10
12-31-2015, 06:34 PM
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Sorry for jumping in like that, not to hijack this thread at all, but does this theory applies to a Richmond 5 speed as well ? I'm experiencing the same "problem" while cold.
Most of the components in that trans are from a Borg Warner Super t-10. Frank. |
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