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Re: Recommend 833 4 Speed Fluid??
[Re: Dennis_K]
#294231
05/05/09 05:00 PM
05/05/09 05:00 PM
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Joined: Apr 2008
Posts: 1,285
Pacific NW USA
CompSyn
pro stock
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pro stock
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
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Quote:
CompSyn, I'm only asking since you know your Amsoil products, is there a reason you recommended the 75W90 stuff instead of this? This is the one that I found at my local Napa store and am using in my Charger. http://www.amsoil.com/storefront/mtf.aspx?zo=1606470
Dennis,
Going by the 1969 Plymouth service manual, the 4-Speed transmission came with SAE 140 gear lube. The service manual goes on to state that in colder weather, use an SAE 80, SAE 90 or ATF.
This is what the Amsoil Technical Service Bulletin says:
API GL-4
AMSOIL product recommended for GL-4 applications is:
• MTG (SAE 75W-90)
"AMSOIL MTG is recommended for automotive and light truck GL-4 applications where 75W-85, 75W-90 or 80W-90 viscosities and GL-4 performance specifications are recommended. MTG is ideal for muscle car transmissions such as Muncie, Borg Warner, Saginaw, Ford Toploader, Dearborn and New Process. Also recommended for Gear Vendors Gear Splitters."
Now let’s compare the differences between the viscosities.
The factory fill SAE 140 has a viscosity of between 24-to-40.99 @ 100-degrees C.
Amsoil Synthetic Manual Transmission and Transaxle Gear Lube 75W-90 API GL-4 (MTG) has a viscosity of 14.7 @ 100-degrees C.
Amsoil 5W-30 Synthetic Manual Synchromesh Transmission Fluid (MTF) has a viscosity of 9.6 @ 100-degrees C.
Amsoil Synthetic Universal Automatic Transmission Fluid (ATF) has a viscosity of 7.6 @ 100-degrees C.
So from comparing the viscosities we can see that as per Plymouth recommendations (circa 1969), you could use a viscosity of 7.6 in colder conditions and up to 40.99 in warmer conditions. Of course lubrication technology has changed immensely since 1969 and we now we have multi-grade gear lubes that don’t have to be change out as per seasonal climate conditions.
As far as comparing the Amsoil 5W-30 (MTF) and 75W-90 (MTG), the 75W-90 is a little thicker and has a little bit more pressure additives for heavier-duty/higher horsepower applications. Further the 75W-90 is a balanced API GL-4 formulation so it doesn’t incorporate the extreme friction modifiers found in API GL-5 gear lubes. This means the 75W-90 (MTG) won’t make for harder shifts.
I’d say if you baby your Charger, the 5W-30 Synthetic Manual Synchromesh Transmission Fluid (MTF) will work fine for you. However, if you have a lead foot or like to race your car sometimes where transmission temperatures might be increased, then I’d think about switching to the 75W-90 Synthetic Manual Transmission and Transaxle Gear Lube API GL-4.
Hope this helps,
CompSyn
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