c-4 transmission shift rpm

rojam18801 · 03-05-2008

got a new pro street car with 347 stroker and c-4 transmission. want to drive on street but found it will not shift gear until engine hits 5000 rpm. does anyone here know how to calm this thing down. need to get it to shift at 1500 or 2000 rpm. what do i have to change? thanks ron

me2stang · 03-05-2008

you can always shift it manualy...? all the way back to 1st then one click up for 2nd then another click for 3rd!

blueracecar · 03-05-2008

you probably should put a manual valve body in it. you may not have enough vacuum because of your cam to shift before that

rojam18801 · 03-06-2008

hey me2stang i tried to shift manual.low ok..2nd ok ..drive almost went into steering wheel ,it went back into low???? people in the aera called cops thinking i was racing. i have another c-4 full manual reverse pattern with trans brake. i can put it in and go but i would like to get the one in it now to shift at lower revs. could use it for a spare. the way it is it's only good for strip use. the guy i bought it from said trans was new from preformance automotive. maybe it is i 'm not sure. need to find out how to slow it down. thanks ron

CAPRIRACER468 · 03-07-2008

sounds to me like the problem is in the v-body.that trans uses vac to shift and probably been altered for drag racing.if you put a full manual v-body in you can shift it when you want. i have a pro comp trans from jw with all the goods in side. most shift kits take care of the problem your talking about so it makes me wonder whats been done to your trans!

rojam18801 · 03-08-2008

thanks capriracer, guess that's what i have to do. it goes like wow but not for street. i'll put my other c-4 in ,it has the tran brake and full manual. does make me wonder what all has been done to it too thanks ron

**EagleAutosports** · 03-15-2008

It could be the governor as well as the valve body. I use a manual valvebody and I wondered once I got it in what took me so long to do it.