RE: 1962 727 Transmission fluid?

Jim,

I believe “conventional” trans fluid (brands mentioned…Dex/Merc…) will suffice for most of our Mopar driving but when genuine technology/chemical advances develop a superior/proven product and budget allows, it doesn’t make sense not to use it; especially if one is racing or putting frequent loads on their vehicle/transmission.

The stacked fin design such as the B&M trans coolers provide the most heat exchange/fluid cooling, come in assorted sizes to meet all driving/racing needs and are worth the investigation. In my 340 Dart GT, I employ a “stealth” cooler wherein I converted an OEM A/C condenser into a transmission cooler mounted in the stock position behind the grill/in front of the radiator. Under the driver side fender is mounted an external trans fluid spin-on filter & temp line to my transmission temp gauge in the cab…MSD 6al box resides under the driver side fender as well. My normal in town driving trans temps are consistently around 165-170F and never peak above 190F when “racing” or “spirited street driving” and cool safely back to 170F-180F after runs almost as quickly as they increased. The huge A/C unit, added trans line footage & filter, and deep pan in my race-prepped 904 w/10” 3500 stall convertor provide a great deal of fluid capacity to afford these “safe” temperatures.

Gary P.

From: 1962to1965mopars@xxxxxxxxxxxxxxxx <1962to1965mopars@xxxxxxxxxxxxxxxx> On Behalf Of Jim Jablonski
Sent: Saturday, April 25, 2020 3:13 AM
To: 1962to1965mopars@xxxxxxxxxxxxxxxx
Subject: Re: 1962 727 Transmission fluid?

Amen on the trans cooler with fan comment. I (stubbornly) ran a cooler without a fan on my Fury and like the moron I am burned my fluid literally the first time I took it to the track. Clutches were damaged and the thing leaked afterward. Expensive lesson learned.

Also, I am pretty anal about logging data on runs and experience big (by bracket racing standards) differences in ETs depending on trans temp - as much as a tenth or more. In an attempt to be consistent, I try to heat my trans up to operating temp before actual runs. Fortunately our track let’s us run “mini-launches” way at the run-off end of the track before time trials. (Or at least they don’t stop us :-) anyway.). I guess my point is cold is not good for transmissions, either.

Long story short I now run a Derale fanned cooler to keep it from overheating and consistent at the top end. I also run an external filter and change that sucker often, if that helps.

Regarding fluid type, ATF4 came out in 1998 so I suppose it would be OK in an old 727 but again, Dex/Merc meets the Dexron III spec which I believe is more than sufficient for a unit originally built in 1962. Unless it is tricked out or something, I suppose. As usual, more details would be helpful.

Stay safe,

Jim

Sent from Jim’s iPhone

On Friday, April 24, 2020, 6:38 PM, glpavlovich@xxxxxxx wrote:

Good information Gary.
With a huge improvement in "fluid technology" these days, I suggest using synthetic transmission fluid in all of our Mopars. Here is an interview quote from JW Transmissions;
"Over the past couple years we have had a large number of general transmission questions so we thought it would be a good idea to sit down with one of the best racing transmission manufacturers in the country for an interview.

Recently, we did just that with John Winters from JW Performance Transmissions in Rockledge, Florida. We have known the management of this company for almost 30 years and have raced with their products for almost as long. The company has a tremendous reputation for building high quality, all US produced products with all US sourced components which we can attest to first hand.

Seeing that there are a million questions that could be asked, we decided it would be best to stay with those basics that would touch the greatest number of our customers.

Race-Mart: What are your thoughts regarding synthetic transmission fluid vs. conventional ATF?

JW: In our opinion, synthetic transmission fluid is by far the best for both street use and for all out racing. The synthetic fluids that are produced today offer so much more protection to the clutches and band surfaces because they have the ability to withstand so much more heat without breaking down. You can figure that by having synthetic fluid in your transmission, it will generally double the life expectancy of your transmission.

Race-Mart: With that being said, what is the normal operating temperature for a transmission?

JW: Normally, transmissions should be operated in the 160 to 200 degree F range. An operating temperature over 200 degrees F is too hot. Excessive temperatures will start to create heat damage to the clutches and bands as well as prematurely break down the transmission fluid. We strongly recommend using a transmission cooler with a fan for vehicles that typically put a lot of strain on a transmission such as heavy or towing vehicles and any form of race vehicle. Also keep in mind that for every second a car is at wide open throttle with a trans-brake the temperature will rise 100 degrees F."

-----Original Message-----
From: 1962to1965mopars@xxxxxxxxxxxxxxxx <1962to1965mopars@xxxxxxxxxxxxxxxx> On Behalf Of 62-65-mail-list-club@xxxxxxxxxxx
Sent: Friday, April 24, 2020 2:13 PM
To: 1962-1965 Mopar Mail List Clubhouse <1962to1965mopars@xxxxxxxxxxxxxxxx>
Subject: 1962 727 Transmission fluid?

Asking for David H. with a 1962 "B".

"For a 1962 727 Transmission what is the recommended transmission fluid? ATF+4?

Here's one reference:
"Dexron III fluid is the minimum one should use. For smoother shifting and less wear in winter, use Chrysler ATF+3 or
ATF+4."
https://www.allpar.com/mopar/torqueflite.html

Synthetic?

Thanks,
Gary H.

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1962 to 1965 Mopar Clubhouse Discussion Guidelines:
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