I was going to put one in the mav last summer and after looking at the c4 and the c6 side by side.......... i decided, no i'd better not. I am almost positive there isnt enough room without cutting or hammering.
John, you don't want to go that way. WAY to heavy and power robbing. They are putting c-4s behind big blocks because of this very reason. With the parts they are making now for the c-4 there is no reason to go with the c-6 other than in something heavy or used to tow with.
I agree with wardf. C6's are great for trucks that tow big loads...but for performance, go with the c4. They weigh about 100 lbs less than a prepped c6, and use about 50 less horsepower to turn it (on a good day!) I saw on another post that someone had stated that c4's arent that great above the 600 HP level....well, I know a guy that uses one that's built almost exactly like ours (except more, thinner clutches in forward and high drums) behind a nitrous 557 big block that has run some 8.30's in the 1/4. Built right, they are very tough. Not to mention they're fairly easy to build by yourself to hold up to respectable power levels.
Thanks guys. I was just wondering, cause I kept hearing all these chevy boys telll me I needed to go with a c6, but I know that guys are running BIG numbers with the c4. Just needed some reassurrance.
Gonna have to call you on that one Mavman . It takes about 35 to 40 HP to run a C6 with five clutches in each pack and around 15 for a C4 , at least 6 or 7 years ago when I last looked into converting to a C4. C6 weigh 160 + pounds depending on which tailshaft housing and pan you have on it . C4s weigh just over a hundred pounds . I am curious ( anyone ) what the price of a prepared C4 would be that could handle around 400 -425 HP . Please don't tell me a stock one will as I know that is not true by experience . Specifically which stock parts do you have to buy after market to make it stand up . I always broke input shafts and/or forward clutch packs . Sometimes the back planetary cage cracked too . I have also seen alot of cases crack around the pump . No problems with convertors though . I am kinda interested now . I am thinking of getting a higher stall convertor and maybe it is time to look at changing to a C4 again .It seems a lot of people are having good luck with them . I liked the C6 because you could basically run a stock transmission , tear it down every 100 passes and have no trouble . Faster ETs are always better though . Any advice will be appreciated .
The c4 will stand up to alot of abuse if built correctly and maintained properly!! Forget about a c6, they are just not the way to go when it comes to drag racing!! I searched around when building my c4 and found out that if you want it to last under MAJOR horsepower numbers you must be willing to spend some $$$$$. I bought a kit from Performance Automatic that included all new drums and performance clutches, hardened input shaft, 6-gear roller planetary, billet aluminum servo, deep pan, manual reverse valve body and several other little things!! This kit cost me about $800 if I remember correctly. I have since changed to a JPT billet t-brake valve body. I have had zero problems with my tranny since it was put together about 2 yrs ago. The tranny has been on several low 6 second passes in the 1/8th and has NEVER hesitated or anything!! In my opinion it was money well spent!! This tranny will last me a lifetime if I maintain it correctly, which means tearing it down at the end of the season and inspecting it and replacing what needs to be replaced. (clutches etc....)
