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Old 07-07-2010, 02:31 PM
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Muncie oil capacity

I jacked my car up and drained the gear oil from my 4 speed and when filling, the oil ran out of the fill hole after about a 1 1/4 pints? I read it was suppose to be three pints, would the car not being level cause it to be off by 1 3/4 pints? seems like alot.

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Old 07-07-2010, 04:31 PM
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Quote:
Originally Posted by turchiac
I jacked my car up and drained the gear oil from my 4 speed and when filling, the oil ran out of the fill hole after about a 1 1/4 pints? I read it was suppose to be three pints, would the car not being level cause it to be off by 1 3/4 pints? seems like alot.
A Muncie M20/21/22 holds over a quart if empty.

BTW, GL-5 spec lube is said to be hard on brass- don't use it unless it specifically says OK for use w/brass tranny components. Some synthetic GL-5 lube is said to be compatible w/the Muncie's guts- but check first! Or, just use GL-4 fossil diff dope (Amsoil's 75w-90 GL4 or Valvoline are two) and don't worry about it. I've not ever used synthetic, but have read that it's too slick for the syncro's.
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Old 07-07-2010, 04:35 PM
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Cool thanks ill have to check the bottle its valvoline 80w90 MT-1 spec.
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Old 07-07-2010, 04:37 PM
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Quote:
Originally Posted by turchiac
Cool thanks ill have to check the bottle its valvoline 80w90 MT-1 spec.
You should be good. White bottle?
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Old 07-07-2010, 04:38 PM
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I think it was blue, not 100% sure though.
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Old 07-07-2010, 04:49 PM
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Quote:
Originally Posted by turchiac
I think it was blue, not 100% sure though.
That's the blended oil. I have no personal experience, but the guy here who sells trannys and parts said there have been reports of (unnamed) problems. From this THREAD:

Quote:
We; and most of the builders reccomend a quart.
Additionally; we ONLY reccomend NON synthetic NON blended 85w90 or the like WITH the GL-4 designation or GL-5 with the MT1 listing. These are safe for the old school synchros. The brand we recommend is Valvoline in the white bottle 85w90 or whatever it is. The blue bottle is a blend and has caused problems in the past. Synthetics are TOO slippery for the synchros to use as a friction brake and they end up clashing...
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Old 07-07-2010, 04:56 PM
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Just checked its a white bottle
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Old 07-12-2010, 09:41 AM
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Cobalt;

The usual symptom is not being able to shift into 2nd under load; foot off the gas, rpm's drop 50% and it'll begrudgingly shift 2nd. The problem with the synthetics is that they're always tinkering with formulas, so what works today...may not tomorrow. Heres the rub with having synthetic lube-related shift problems: Synthetics are so tenacious that it can be hell flushing them out of the box without disassembly.

That being said, This is not a knock against the synthetic lube industry...it just doesn't fit this specific application very well AND brand new transmissions shift very tight, I'd guess most people haven't driven a brand new Muncie, and those that have probably don't remember.

Drive it for 200miles, drain the quart and reload with fresh oil
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