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Re: Type F or Dexron? And WHY???
[Re: topfueldart]
#1260446
07/03/12 05:29 PM
07/03/12 05:29 PM
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Joined: Jan 2003
Posts: 25,902
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,902
Rio Linda, CA
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The OP also asked "WHY" and the simple answer is.....some fluids are "more slippery" than others; the slippery fluids lubricate best and the not-so-slippery fluids give firmer shifts (less slippage).
Generally speaking, the 3-speed transmissions don't need a lot of lubrication because their geartrain only operates in the lower two gears so type F is suitable for them but the gears in OD transmissions operate nearly continuously so they need the added lubrication properties of fluids like ATF+4 and Dexron/Mercon.
In modified transmissions with really high line pressure, the slippery fluids are less of a slippage issue because the higher pressure reduces clutch/band slippage.
The INTERNET, the MISinformation superhighway
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Re: Type F or Dexron? And WHY???
[Re: Valiant_Showoff]
#1260449
07/04/12 12:17 PM
07/04/12 12:17 PM
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Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
cheapstreetdustr
master
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master
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
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normally id go with what your trans builder suggests..
however his reasoning...seems a little suspect or at the least vague
the issue as i see it is this..
band materials..im not a trans expert i cant even work on a transmission its like chinese to me i always refer to the experts..
however that doesnt mean ive not payed attention.
but i digress.
band materials have changed alot over the yrs..old style band materials may have required the type f or the merc..or atf I,II,III,III
i would base my trans fluid on the band and or clutch materials. this defers back to your builders recomendations..
I like what ive read about the ATF IIII, i understand that in a lot of cases it supercedes the fluids used previously..but again im no expert.
id use what your trans guy suggests or find out what parts he used in your trans and then use that info to base what the other trans experts recommend/opine
best regards..
365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured
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Re: Type F or Dexron? And WHY???
[Re: racerx]
#1260451
07/04/12 03:21 PM
07/04/12 03:21 PM
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Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
MRMOPAR622
top fuel
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top fuel
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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I have always run a good grade of type F,but the last time I got the B&M for just a few cents more. Next time I will go with ATI's new type F.
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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Re: Type F or Dexron? And WHY???
[Re: MRMOPAR622]
#1260452
07/04/12 06:52 PM
07/04/12 06:52 PM
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Joined: Jan 2003
Posts: 5,894
Florida
Locomotion
master
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master
Joined: Jan 2003
Posts: 5,894
Florida
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I ran Type F until I learned about Amsoil Supershift - basically a synthetiuc with enhanced Type F frictional properties. Synthetics hold up to heat MUCH better than conventional fluids so it provides extra insurance, last longer and run cooler. Firmer shifts reduce heat. As for one comment about 904's having a "ton of line pressure" and don't need the extra firm shifts & holding ability - like an oil pump in an engine, any excess pressure that isn't required takes up horsepower! ( i.e.: I was told that a trans brake valve body needs extra pressure and will actually be slower than a "regular" reverse pattern valve body when footbraking - all else being equal.) My trans builder also said to keep using whatever I'm using on several occasions when I brought my trans in for freshening! They always look good. I use the 4.2 lever and I believe he uses the "red" clutches. Amsoil Supershift Amsoil source & more info
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Re: Type F or Dexron? And WHY???
[Re: GTX MATT]
#1260454
07/06/12 02:29 PM
07/06/12 02:29 PM
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Joined: Jan 2003
Posts: 11,723
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,723
Portage,michigan
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Quote:
Quote:
I have always run a good grade of type F,but the last time I got the B&M for just a few cents more. Next time I will go with ATI's new type F.
I was wondering also about that B&M Trick Shift. It says it meets or exceeds Type F requirements. Anyone else using this?
I used that stuff years ago.
After finally being told by a number of people you are wasting your money paying extra for that stuff, i listened.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17
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Re: Type F or Dexron? And WHY???
[Re: GTX MATT]
#1260457
07/07/12 09:35 PM
07/07/12 09:35 PM
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Joined: Jan 2005
Posts: 3,635
Oakland, MI
dizuster
master
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master
Joined: Jan 2005
Posts: 3,635
Oakland, MI
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Quote:
Quote:
I have always run a good grade of type F,but the last time I got the B&M for just a few cents more. Next time I will go with ATI's new type F.
I was wondering also about that B&M Trick Shift. It says it meets or exceeds Type F requirements. Anyone else using this?
I had it behind my turbo small block, but it's only been on the dyno. It had stock tan cluches and an old Turbo Action valve body. Held fine to 470hp at the tires... LOTS of torque.
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Re: Type F or Dexron? And WHY???
[Re: dizuster]
#1260458
07/08/12 05:31 PM
07/08/12 05:31 PM
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Joined: Jan 2003
Posts: 1,607
Western Washington
Sixgun
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,607
Western Washington
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I was told many many times over the years, and a few months ago right here on this site, that the reason we are supposed to use Dexron/mercon was compatibility with the friction materials in the torqueflite trans.Compatibility was the driver there. I DO remember an "urban legend" and maybe the B&M instructions for the transpack themselves saying to use type F for a firmer shift. If different friction materials were/are being used then or now,then all bets are off, and it falls to the pro builder of the trans to know and recommend the right juice. Also the "plus 4"was explained to be slipperier (?) than previous Mopar recommended ATF (lower friction coefficient) for driveability and wear issues on the "newer" generation of chrysler vehicles.Not performance oriented, was what I was told here. 
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Re: Type F or Dexron? And WHY???
[Re: Sixgun]
#1260459
07/08/12 09:11 PM
07/08/12 09:11 PM
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Joined: Nov 2010
Posts: 3,696
jersey
Spaceman Spiff
master
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master
Joined: Nov 2010
Posts: 3,696
jersey
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Use what your trans builder recommends.
Or if it's a stock unit, call and ask a few 727 specialty places.
526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!
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Re: Type F or Dexron? And WHY???
[Re: Spaceman Spiff]
#1260461
07/09/12 04:43 PM
07/09/12 04:43 PM
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Joined: Jan 2003
Posts: 25,902
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,902
Rio Linda, CA
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Let's face it, there are a bunch of "pro builders" and they all use the same materials in the build so their choice of fluids is just their opinion....deviating from the builder's recommendation isn't gonna cause a catastrophic failure.
IOW, if Billy Bob and Ernie Joe each build the exact same trans but each recommends a different fluid who's right/wrong?
The INTERNET, the MISinformation superhighway
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Re: Type F or Dexron? And WHY???
[Re: John_Kunkel]
#1260462
07/09/12 07:19 PM
07/09/12 07:19 PM
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Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Quote:
IOW, if Billy Bob and Ernie Joe each build the exact same trans but each recommends a different fluid who's right/wrong?
Id say Ernie Joe, Cause we all know Billy Bob doesnt know Shick 
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but it's getting hard to find in my area anyone else having this problem?
