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View Full Version : Thinking about a C4 swap,need some input.

EHardy1971
11-25-2008, 09:15 PM
Ok,I've been kicking around the idea of swapping a C4 in place of my AOD. I know where a Turbo coupe C4 is for REAL cheap,and even after a rebuild (and possibly a transbrake :D) I would not be into it for very much money. I know I'd have one gear less,which would be a disadvantage on the street,but the advantages seem to outweigh that,IE; more durable,lighter,cheaper to mod,etc,etc. Tell me what other advantages/disadvantages there would be to the swap.:shrug:
86GTPONY
11-26-2008, 07:13 AM
What year turbo coupe? If memory serves me right, the t-c's came with the dreaded A4LD. I know I pulled one out of my 87 when I went to a t-5. Good for a boat anchor, not much else.
EHardy1971
11-26-2008, 10:02 AM
I'm not sure Don,it's a 4 eye T-coupe,and it's definately a C4. It's sitting in the trunk of the car,so I got a real good look at it. I know I'd have to swap the bellhousing,but I just happen to have a C4 shortshaft from a '71 F-100 that was a 302 truck.
SlowJoe
11-26-2008, 10:07 AM
i am in the process of getting 4r75w parts together for my car. if i did not drive it so much i would go c4. what size converter you thinking about?
86GTPONY
11-26-2008, 10:12 AM
According to www.turbotbird.com (http://www.turbotbird.com) the 83-86 turbo coupes had a C-3 in them. 87-88's had the A4LD. The 83-86's are the 4-eyed.
EHardy1971
11-26-2008, 10:19 AM
i am in the process of getting 4r75w parts together for my car. if i did not drive it so much i would go c4. what size converter you thinking about?
Probably a 10" with a 2800-3000 stall.

According to www.turbotbird.com (http://www.turbotbird.com) the 83-86 turbo coupes had a C-3 in them. 87-88's had the A4LD. The 83-86's are the 4-eyed.
Crap! I did'nt think about the C3! I know some of the parts between the C4 and C3 are interchangeable,I just wonder if the output shaft and tail shaft would work on my C4? :shrug:
SlowJoe
11-26-2008, 10:24 AM
Probably a 10" with a 2800-3000 stall.


Crap! I did'nt think about the C3! I know some of the parts between the C4 and C3 are interchangeable,I just wonder if the output shaft and tail shaft would work on my C4? :shrug:

waypastcrazy has some c-4 parts if u need them and cheap.

and i think the trans brake/manual valve body is the way to go if you are going to racing it! and on the street it will still be like a stick car:jester:
qkjuicedpony
11-26-2008, 10:53 AM
keep the aod. put a good valvebody in it
coupe
11-26-2008, 12:09 PM
keep the aod. put a good valvebody in it

+1 :yup:
EHardy1971
11-26-2008, 12:46 PM
keep the aod. put a good valvebody in it

+1 :yup:

That's what I'm probably going to do. I know you can use some of the AODE internals in an AOD to beef it up. I don't see me getting a transbrake for it though,they run $700-$900 on the AOD! :eek:
89five0Gt
11-26-2008, 12:54 PM
hell E you only drive 5 yards to work so I know you ain't worried about gas mileage. get the C-4 and then sell me the stall for the AOD
EHardy1971
11-26-2008, 01:02 PM
hell E you only drive 5 yards to work so I know you ain't worried about gas mileage. get the C-4 and then sell me the stall for the AOD

:slap: I do sometimes drive it to other places besides the depot,besides,that stall converter ain't going to work with that Tremec of yours! :jester:
89five0Gt
11-26-2008, 01:04 PM
:slap: I do sometimes drive it to other places besides the depot,besides,that stall converter ain't going to work with that Tremec of yours! :jester:

I have 2 AOD's and one is going in my red truck :wiggle:
SlowJoe
11-26-2008, 01:16 PM
i am looking into the transgo manual valve body setup. what year trans do u have? i called ptc yesterday and they say for mine 3000-3600 10" stall for 500. and they say there is about 300 rpm difference between lockup and non lockup.
EHardy1971
11-26-2008, 01:47 PM
i am looking into the transgo manual valve body setup. what year trans do u have? i called ptc yesterday and they say for mine 3000-3600 10" stall for 500. and they say there is about 300 rpm difference between lockup and non lockup.

Mine is an '86 out of a Cougar,which has gotten my curiosity up about the gear ratio differences in the AOD's,depending on their application. I already have a stall in mine,it's a B&M Holeshot 2400,11",non lockup. When I put that in there back in the summer,the converter ALONE took a full half second off of my ET!
SlowJoe
11-26-2008, 01:59 PM
what gears you got? i would do some searching on 94-95 years
EHardy1971
11-26-2008, 02:02 PM
what gears you got? i would do some searching on 94-95 years
I've got 3:73's in the rear. The '94-'95 have the AODE (electronic overdrive),but alot of the hard parts from it,and the 4RW70 will work in the AOD.
SlowJoe
11-26-2008, 02:20 PM
I've got 3:73's in the rear. The '94-'95 have the AODE (electronic overdrive),but alot of the hard parts from it,and the 4RW70 will work in the AOD.

it my be better to just put the valve body in a AODE. unless you want to keep the auto shift. thats what i am doing full manual. i am thinking this kit but i found a full manual vavle body without brake for like 500.

http://www.bulkpart.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=2&Product_Code=T76173E&Category_Code=AODEvbkits&Product_Count=2