Recently did a C4 conversion on my 93 vert. Problem Im having is that when you have the stick in drive and take off from a light, its not starting off in first gear, its in second. Basically its like a 2 speed, just goes from 2 to 3. If you use the stick to manually shift, it gets 1-2-3 no problem so I know it will phisically go into gear and all that. The trans has a fresh rebuild on it. My nephew rebuilt it in his auto tech class up at the community college and he has spoken with his instructor but he doesnt seem to have any idea what could be causing it.
I was thinking maybe the modulator had issues and I read somewhere there needed to be like 11+ inches of vacuum at the modulator in idle. I put a guage on the modulator line at the trans and it has the same 14" that I have at the intake. I'm also not running a kickdown rod but most everybody I spoke to about it swears I donr need it. One guy I know that I think knows his **** said that it is required and that it acts like the TV cable on an AOD and wont have enough pressure on the bands or something if its not hooked up. I have never run a kickdown on my chevy automatics and have never had any issues. Any thoughts on this?
I was thinking maybe the modulator had issues and I read somewhere there needed to be like 11+ inches of vacuum at the modulator in idle. I put a guage on the modulator line at the trans and it has the same 14" that I have at the intake. I'm also not running a kickdown rod but most everybody I spoke to about it swears I donr need it. One guy I know that I think knows his **** said that it is required and that it acts like the TV cable on an AOD and wont have enough pressure on the bands or something if its not hooked up. I have never run a kickdown on my chevy automatics and have never had any issues. Any thoughts on this?