[gelo]

hi guys i just got a question Im fixing to swap my aod tranny on my 89 mustang gt,but i can get c4 or c6 for a same price and i dont know which one is better for what i want for,dragracing.thank please help me

[Tominator]

C4 by far!

The C6 is for heavy duty applications. One of the best transmissions ever made, but it's heavy and takes MUCHO HP to work. You NEED that HP at the track.....

[gelo]

thanks that is what i have in mind,but i was it sure.thank again

[gelo]

if go for c4 tranny what gear i should use?thanks

[Tominator]

Originally Posted by gelo

what gear i should use for a c4 tranny? a 4:10 or lower or higher gear

Not possible to give advice without your HP goals.

Your complete combo is a factor as well.

You will need to buy the proper torque converter and the manufacturer will need all your info to give you the proper combo.

[bigbad5.0]

you mean axle ratios?

[blueracecar]

what size tires, and how much stall are you gonna have? i have a 4000 stall 28" tires and 4.10 and i cross the finish line about 6200 rpm

[blueracecar]

my tansmission guy says dont ever put a c-6 in a small block it robs all your hp and it is way too heavy

[shinerstang]

C6's are heavy!!!!! You would never need one with a properly built C4.......