C4 Adapter Fittings
#6 AN adapter fittings for the early C4 cooler ports. I wanted some and didn't see these available anywhere, so I started making the parts.  If you need some, I try to keep several sets in stock. They come with a set of USA made Viton o-rings. These are #6 x 1/8-27 NPS thread and should fit most or all of the late 60 and most 70s cases. 

There are cases out there with 1/4 thread ports (later C5 maybe?) and when I can find a case like that I will make some adapters in that size. 
Air pressure testing - that o-ring seal that Ford uses does pretty well.  I've had the pressure up to 100 psi with no leaks.
Installed - the 90 degree fittings you use may require a bit of trans tunnel massaging for clearance.  Depends on the chassis.  No problem with fit on the Falcon.  The 1970 Mustang required a little hammer work on a sheet metal seam in the tunnel.
 
Email or PayPal to ckelly AT raceabilene DOT com - Thanks!
$16 a pair plus current Small flat rate shipping to US 48 state addresses. I use the USPS Priority Small Flat Rate Box and it usually gets there in 3-5 days after pickup.  Yes, I have to nick Texas residents for 8.25% sales tax.  The USPS boxes will handle several pair, so there is
no upcharge for multiple orders. 

I do ship overseas - please email for a quote.  Shipping outside the US is usually in the $12~$25 range, depending. 
 
Canada, Netherlands, Australia - Ford hot rodders are all over the planet.
 
Additional transmission related links (all open in new window)


Good parts source: http://bulkpart.com

Another performance parts source - Broader Performance

http://broaderperformance.com

The massive C4 info thread at FordMuscle.com
- Best C4 reference on the web

C4 build article at MustangAndFords.com

C6 build article at MustangAndFords.com

C4 servo sizes - also more ID info and some of the old Burly 4x4 info <-link gone
NOTE - If anyone has the old Burly data, I'd be happy to host it.


C4/C5 Bellhousing Application Data

C4 Bellhousing and flexplate info at TCI.com

C4/C6 information at Baumann Engineering
(also see their other Ford trans tech, including AOD, AODE, E4OD, 4R70W, etc)

AOD swap info at hotrodders.com

More tranny info from hotrodders, including notes on parasitic HP loss


Power loss for various auto transmissions:
Please remember these are approximate values, and were provided by Car Craft Magazine.
Powerglide_____18 hp
TH-350________36 hp
TH-400________44 hp
Ford_C-6______55-60 hp
Ford_C-4______28 hp
Ford_FMX______25 hp
Chrysler_A904__25 hp
Chrysler_727___45 hp

Dan Jones' C4 to AOD swap page at The Mustang Shop

Articles:
What's up with stall?  Car Craft
http://carcraft.com/techarticles/80098/