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c4 vs. AOD
I've got a lightly modified 91 GT with a stock AOD. But I've got a chance to get a c4. The question is...do I want the c4. What are the advantages and disadvantages of these two transmissions?
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From what I understand about these transmissions is that the c4 is stronger and lighter but you lose your overdrive, so your rpm's will be higher. The c4 is a good transmission but if you want to stay with a good aod lentech makes one rated to 600 hp for $1995.00. If you don't have that much money get the c4.
------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph |
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Regards, Paxtoned_88 |
Hey!! Wallace is right up the road from me. About the c-4, I sometimes wish I had gotten a c-4 instead of throwing all the money at the aod. Ok, you lose od but I've concluded the trade off is well worth it.
------------------ Rick My 89lx(updated 11/5/2000) My 97 Cobra |
Hmmm. Kinda surprised with all the complements people are giving the C4. I got one and am very happy with it, but I always wondered how it would be to swap in a beefed up AOD (get that overdrive). Yeah, I have heard that it costs a lot to make an AOD strong compared to a C4, but does it really take much work? Am I right to say that if it weren't for the cost of beefing up an AOD, that most people would just about always prefer it over a C4?
------------------------------- '79 Mustang Coup 4" Cowl Weld wheels (15x6;15x8) Stock 5.8L C4 w/ shift kit 1.5" MAC full length headers Holley 750 CFM Edelbrock intake 2.5" Off road H-pipe 8.8" Rear end w/ 2.73:1 gears (sucks!) Front: 225/60/15 Rear: 255/60/15 Eagle GT II Sucky Purolator air filter that's choking my car. http://www.mustangworks.com/interact...gboard/mad.gif |
I may go for the C4, since I do not drive real long distance. I am not worried about gas mileage because it is a mustang.
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You can have it both ways. Gear Venders has an add on unit for the C-4 that's supposed to be super good. About $2000 though and a drive shaft job on top of that. These units are said to be good to 600 hp (you'd need a built C-4 to handle that). Lots of $$$, but they're supposed to be good. My $.02.
Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi. |
Hey rev how about a little more info on what it is you are talking about.
What does it do and what is it? ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph |
It's an add on over drive unit that repaces the stock Tail shaft unit. It is longer than stock, so drive shaft work has to be done. I think there's a recent article in Mustangs and Fords on this. It does give either an automatic (tail shaft speed) or a manual push button operated over drive. It's supposed to be hellaciously strong (up to 600 lb/ft). They are expensive, $2000 or more. I bet they have a web site. Anyone know? Check Gear Venders.
Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi. |
Thats pretty cool, I will have to check that out. Thanks rev
------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph |
C-4 all the way!!! The AOD is nothing but a boat anchor in my opinion. AOD's can't handle the power a C-4 can without dumping a small fortune into it.
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Thanks for all your info, BUT this is gonna be a daily driven car, not a pro street dragster! I'm not planning on dropping any other engine into my car anytime soon. So unless I go crazy with the mods then I'm not gonna need anything super strong. I was just wondering if the transmission ratio's were about the same, I thought they were but I'm not sure. And didnt the early fox-body mustangs come with c4's? On and I have read about gear vendors, I'd love to get them....If i happen to find a couple thousand lying around the house! Thanks for the help http://www.mustangworks.com/interact...oard/smile.gif
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how much will your mileage suffer if you switch from an aod to a c4??
My car gets about 12 mpg now with an aod ------------------ 4 cyl converted to 302 comp cams cam, ported GT 40 heads, Edelbrock intake, holley carb Turbo coupe rear with 373's 4 inch cowl hood finally done after what seemed like forever!!!!! |
Personally, i'm going with a lentech. They are good up to 700hp and have overdrive intact with or without lockup. My car is a daily driver and I hope to be making 450-500rwhp once I get it finished...
------------------ 92 AOD GT, K&N, ram air, pulleys, 2 ch. flowmasters, 4:10's, shift kit, 1 5/8 mac longtubes and offroad hpipe 14.249 @ 97.34 mph before the headers and hpipe [This message has been edited by FivepointOH (edited 01-01-2001).] |
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