C6 transmission advice needed
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Laughing Gas
Joined: Nov 2013
Posts: 1,207
Likes: 60
From: S.E. Louisiana;so far USA
C6 transmission advice needed
Hi Folks,
I’m a newbie. I’ve been reading the forum for over a year, but this is the first post.
Last year I bought a 1976 F-250; 460 engine; C6 transmission; 60K miles, thought to be accurate. Amongst other things, I thought that I should do a transmission fluid change, as the original owner used it to pull a camper trailer, and the fluid probably has never been changed. The transmission works correctly and the fluid appears as a light tan color on the dipstick. The first question is: What is the correct fluid? The owner’s manual (March 1976), shop manual (September 1975), and dip stick all indicate type F. Posts on the forum indicate that Ford started changing fluid type on 1 May 1976. The truck had final assembly on or about 2 June 1976 in San Jose with delivery to the customer on 11 June 1976 in Woodland, CA. The ID tag on the transmission shows the following:
PJD L9 E14
D5TP BDA054261
My second question is regarding the advisability of adding an inline filter on the cooling line. I was considering using a spin-on type filter without the anti-drain back valve. Nominal micron ratings available are 10 with no bypass and 21 with a bypass opening of 8-11 PSI. Both have flow rates of 7-9 GPM (max.) and were intended as transmission filters.
Any comments or suggestions on this “project” would be appreciated. The forum is great, as we can pool our knowledge.
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I’m a newbie. I’ve been reading the forum for over a year, but this is the first post.
Last year I bought a 1976 F-250; 460 engine; C6 transmission; 60K miles, thought to be accurate. Amongst other things, I thought that I should do a transmission fluid change, as the original owner used it to pull a camper trailer, and the fluid probably has never been changed. The transmission works correctly and the fluid appears as a light tan color on the dipstick. The first question is: What is the correct fluid? The owner’s manual (March 1976), shop manual (September 1975), and dip stick all indicate type F. Posts on the forum indicate that Ford started changing fluid type on 1 May 1976. The truck had final assembly on or about 2 June 1976 in San Jose with delivery to the customer on 11 June 1976 in Woodland, CA. The ID tag on the transmission shows the following:
PJD L9 E14
D5TP BDA054261
My second question is regarding the advisability of adding an inline filter on the cooling line. I was considering using a spin-on type filter without the anti-drain back valve. Nominal micron ratings available are 10 with no bypass and 21 with a bypass opening of 8-11 PSI. Both have flow rates of 7-9 GPM (max.) and were intended as transmission filters.
Any comments or suggestions on this “project” would be appreciated. The forum is great, as we can pool our knowledge.
<!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles> </xml><![endif]--><!--[if !mso]><object classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D" id=ieooui></object> <style> st1\:*{behavior:url(#ieooui) } </style> <![endif]--><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} </style> <![endif]-->
Cargo Master
Joined: Aug 2007
Posts: 2,560
Likes: 69
From: New Zealand
My understanding is........pre '77 - Type F; '77 on - Mercon/Dexron.
Assuming your trans has been rebuilt since the 70's, it should have later soft parts & will be M/D fluid compatible.
I don't have any automatics right now, but when I did I used a filter for a few weeks after a swap/install to catch anything that may be present, then removed it.
Some re-builders recommend this; some recommend keeping the filter.
You could try this site - Ford Transmission Forum
Assuming your trans has been rebuilt since the 70's, it should have later soft parts & will be M/D fluid compatible.
I don't have any automatics right now, but when I did I used a filter for a few weeks after a swap/install to catch anything that may be present, then removed it.
Some re-builders recommend this; some recommend keeping the filter.
You could try this site - Ford Transmission Forum
Postmaster
Joined: Jun 2014
Posts: 3,206
Likes: 3
From: Oakhust NJ Jersey Shore
Mercon/Dextron will be fine, inline filter is allways a good idea, but you should run a trans temp gauge, just in case that gets plugged, you have the stronger of the c-6's should for a long time, just where's the overdrive?
Laughing Gas
Joined: Aug 2002
Posts: 1,069
Likes: 19
From: Central Wisconsin
Type F… Mercon/Dexron will cause the clutch plates to slip and destroy themselves. Type F has a friction modifier that is needed… Dexron/Mercon does not.
I lost two transmissions in two weeks in two different vehicles after my local shop used the wrong fluid when doing a flush.
I lost two transmissions in two weeks in two different vehicles after my local shop used the wrong fluid when doing a flush.
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