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Transmission decision - need advice

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Old 11-08-2018, 07:37 PM
Nancy 1966
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Transmission decision - need advice

My 1966 F250 camper special custom cab came with a green dot c4 according to the factory plate. However when we took the transmission out, it was a FX with an external transmission oil cooler attached directly to the transmission. We replaced with a C6 and rebuilt the FE block 352. The FX external cooler lines ran from the cooler to the the driver side of the engine block and from the radiator back into the external cooler. My question is: Should I try to use the engine block plumbing with the new external trany cooler? Should I plug the engine block hole and install a external new trany cooler? should I do something else completely? Has anybody else seen this type of configuration on the camper special? seems to be a lot of options out there.
 
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Old 11-08-2018, 08:43 PM
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Your OEM trans was probably that MX, not a C4. That said, it appears it used coolant circulated through the engine and radiator back to the transmission's external cooler. You can't use that with a C6. The C6 sends the transmission fluid up to the radiator and back, not coolant.

You could either find a radiator with the trans cooler in the bottom, or use an aftermarket cooler with a thermostatic control. You will have to plug the engine block.
 
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Old 11-09-2018, 01:14 AM
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Originally Posted by Nancy 1966 View Post
My 1966 F250 camper special custom cab came with a green dot C4 according to the factory plate. Impossible!

However when we took the transmission out, it was a FX with an external transmission oil cooler attached directly to the transmission.
No FX's installed in F100/350's after 1964.

C4's were not installed behind FE engines (352/360/390 etc).


1961/78: You cannot go by the 'G' TRANS code stamped on the Warranty Plate to ID the type of A/T, you wanna know why?

The IDIOTS at FoMoCo used the 'G' TRANS code for
ALL A/T's! One had to know which trans was installed with what engine. It was a royal PITA back then and still is today.

1979: The IDIOTS finally woke up: G = C4 & K = C6.

1965/67 F100/350 352: The
only A/T was the MX Cruise-O-Matic (aka BIG Cruise-O), the larger brother of the FX Cruise-O-Matic (aka SMALL Cruise-O).

btw: The green
dot shift lever dial (C5TZ-7B033-A) is the same for C4 (240/300 I-6) & M/X (352) Cruise-O-Matics in 1965/66 F100/250's.
 
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Old 11-09-2018, 08:40 AM
Nancy 1966
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Thanks All- That clears some of the history for us. Looks like we are going to have to plug the engine block for sure. Any opinions out there for a radiator with the trans cooler in the bottom, or use an aftermarket cooler with a thermostatic control? Pros and Cons of installing one or the other?
 
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Old 11-09-2018, 09:25 AM
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Originally Posted by Nancy 1966 View Post
Thanks All- That clears some of the history for us. Looks like we are going to have to plug the engine block for sure. Any opinions out there for a radiator with the trans cooler in the bottom, or use an aftermarket cooler with a thermostatic control? Pros and Cons of installing one or the other?
I'm trying to take my 1966 F250 Camper Special back toward stock configuration and I am looking to purchase a set of the cooling lines that anyone has removed from their truck. If you would be willing to consider selling the pieces I'd be a buyer. A fellow in Tennessee *might* come up with a set but I wouldn't mind if I end up with two sets of everything to have a backup set.

I do have the "Y" for the lower radiator hose and the cooler itself with the brackets, so I could buy just the lines and brackets that go from the engine block sides to and from the cooler. Whatever you might be willing to part with.

Thanks for considering
Chad
 
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Old 11-09-2018, 10:15 AM
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If Chad doesn't need the "Y" or the cooler I would be interested in them as a back up. Thanks Scott
 
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Old 11-09-2018, 10:41 AM
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Originally Posted by 85e150six4mtod View Post
Your OEM trans was probably that MX, not a C4. That said, it appears it used coolant circulated through the engine and radiator back to the transmission's external cooler. You can't use that with a C6. The C6 sends the transmission fluid up to the radiator and back, not coolant.

You could either find a radiator with the trans cooler in the bottom, or use an aftermarket cooler with a thermostatic control. You will have to plug the engine block.
If I understand the setup right the stock MX transfer the heat (trany to water) at a cooler back by the trany?
If so what difference does it make if the transfer of heat happens back there or in the radaitor like the way you want him to do it?
You would still have heat transfer just at a different location. Other than the C6 it would look factory stock.
Dave - - - -
 
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Old 11-09-2018, 02:20 PM
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Originally Posted by Nancy 1966 View Post
Any opinions out there for a radiator with the trans cooler in the bottom, or use an aftermarket cooler with a thermostatic control? Pros and Cons of installing one or the other?
My own opinion:
Use both, especially if you are putting the "Camper" in "Special".
Reason: the radiator cooler will help cool, but more importantly (I think), it will help regulate the transmission oil when used with an aftermarket cooler.
The aftermarket cooler adds both needed cooling under stress, and also more oil, which aids cooling and transmission life.

If a show truck, just the radiator cooler will be enough.

BTW, all aftermarket radiators have the cooler built in, to eliminate two part numbers. If you were to put the radiator in a manual transmission truck, don't use the cooler (I HAVE been asked that question).

Cosmo
 
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Old 11-09-2018, 07:37 PM
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Originally Posted by FuzzFace2 View Post
If I understand the setup right the stock MX transfer the heat (trany to water) at a cooler back by the trany?
If so what difference does it make if the transfer of heat happens back there or in the radaitor like the way you want him to do it?
You would still have heat transfer just at a different location. Other than the C6 it would look factory stock.
Dave - - - -
Best to abandon old cooler with a new transmission.
 
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Old 11-10-2018, 06:55 AM
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Originally Posted by 85e150six4mtod View Post
Best to abandon old cooler with a new transmission.
That may be true but a good flush with carb or brake clean and blown out with air will work also.

I also like using 2 coolers, first thru the radiator to pull the really hot heat out then the aftermarket one.
I have done it this way on a few different cars & trucks pulling heavy rrailers.
Dave - - - -
 
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Old 11-10-2018, 07:18 AM
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My '65 C/S still has the original cruise-o-matic and had the external cooler as well. Due to the condition of the cooler when I bought the truck, I decided to remove it completely. I now have it plumbed to the radiator’s built in trans cooler, since I changed that as well. As my daily driver/work truck, I've never towed anything, but do haul loads of about half ton regularly and have had zero issues. Since you're changing the transmission I'd suggest going with the setup that was made for it and do away with the side mounted cooler.
 
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Old 11-11-2018, 05:51 AM
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Trans cooler

This is a picture of the cooler on my truck. Here is a link to Summit https://www.summitracing.com/parts/sum-g4961a/overview/
The problem with these trucks is there isn't enough room in front of the radiator to install a heavy duty cooler even this 3/4 in thick one required removing some metal from the hood latch lever. Since water is much better at removing heat than air you really need to have a radiator cooler in tandem with the add on cooler. Any radiator shop can install a trans cooler line in the bottom tank on the radiator you have now.


 


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