I heard a c-4 automatic tranny mentioned on another thread... what is it?

 

A FORD automatic transmisison

 

yeah I dont have any idea why you'd go out of your way to attach a slushbox to a rotary, but too each his own I guess.

 

c-4 and c-6 trannis are extremely tough and last damn near forever especialy for an automatic tranni.

 

actually... teh c-6 is pretty much bulletproof... on the other hand

the c-4 can be a finiky little bastard....i would know... i put one in my comet.. and my cousin killed one ona torino.. all in like a 3 month period... not to mention the 3 or so that they had to put in my grandmothers maverick

not being a dick.. just making a statement

 

well anyway i was half way there my cuz hasn't had any troubl so i asumed that they were both tough my mistake btw fyi any car that has a 4aet tranni stay away

 

my buddy just blew out the c6 in his truck. I dunno about bulletproof.

But I still dont see why youd put taht in a rex.

 

4aet? is that the pseudo c4 that mitsubishi ( or someone.. i forget who) was making for ford in the early 80's? i cant rememebr the code if not. but we have an old pos granada with what we thought was a c4.. turns out its not.. its some japanese tranny that ford used

 

MY question has been answered. Thanks!

 

The C6 is pretty damned bulletproof, but you can break anything.

The C4 on the other hand is aptly named... after an explosive compound! They *can* be built to be fairly beefy, and they weigh a lot less than the C6. But there's a reason Ford never offered the C4 behind big-blocks, and they never offered the AOD (an overdrive C4) behind the straight six in the trucks.

The 3-speed JATCO trans used behind rotaries seems to be fairly beefy, however you can't really get performance parts for it. I've heard of some very quick rotaries (big turbos) using bone stock JATCO's with no problems.

 

what kind of class would require you to run an auto tho?

 

HAHA, my old '66 Mustang had a C4 tranny in it. 3 whole gears, whohoo!!

 

Autos are advantageous for drag racing. Better launch, faster shifts, and with a good converter you can have a fairly narrow powerband and rely on the converter to keep it from falling off the torque curve after a shift. Torque converters are basically fluidic CVT's.

It gets expensive going through $800-900 converters trying to find the one that best works for your combination, though.

 

I am looking at building a drag car for next year. I know a bunch of people run auto's at the strip, but I was never sure why.

I do understand the problem about torque convertors going out tho. Thats the main reason why the auto RX-8 has a 4 port engine, with a 7500 RPM redline. They were blowing out torque convertors at the 9,000 RPM redline of the 6 port version.

 

Also on automatic turbo cars, you can launch on boost and never take your foot off the throttle, so boost is maintained throughout the run.

 

Most early fords (60's) and (70's) V8 and in-line 6's used a cruise-a-matic auto transmissions. the hi-po 271 289's and shelbys anything performance wise got the C-4's
they look the exact same on the outside it's mostly valvebody differences. C-6's are bullet proof as well as the 'N' case 9' inch 3rd members, and carriers 28 or 31 spline axles.

 

Someone please delete this. I double posted

 

For drag racing on most V8 engines the best transmission is a powerglide..IMHO..

 

Better than the AOD

 

thcruise o matic are ( from what ive seen atleast) more like early 60's... all the late 60's and up fords ive dealt with are usually a c-4 if its a small block L6 or small block v8..... i might be wrong.. im just juding by the galaxies/ fairlanes/comets/mavericks etc ive been around...

please correct me if im wrong.. its always good to learn somehting new

 

Don't forget the FMX! Cast iron case. Usually found behind 351Cs.

 

hey peejay maybe you can help. since you mentioned clevelands.... we have one thats in a 70 torino...and the tranny ate **** and died.... well weve been told that the tranny is a c-4 by several tranny shops... but we have yet to find a c4 that will fit...... we have the one we pulled..and the main problem seems to be that the TQ converter in this tranny is a dif size than all the others that weve come across....

so would this tranny be an fmx ( ive never even heard of an fmx.. enlighten me )

thanks


and sorry.. not meaning to threadjack here