Missing a Speed?

[tbar12]

I have a 66 Mustang with a 351 Cleveland engine, 750 Edelbrock carb and stock C4 tranny. Unfortunately, the C4 transmission is not kicking into the higher gear/speed at higher speeds (60+ mph). It did when the 289 was in it and purred from 60 - 90 mph).

What should I be looking at? How can I increase my bandwidth?

[Rev]

My thoughts would be to check the kick down linkage adjustment and the vacuum moulator. Both are adjustable and do influence upshifting.

Rev

[tbar12]

Rev,

Thanks so much for the advice. Unfortunately, I only know enough to be dangerous. How/Where do you check the kick down linkage adjustment and the vacuum modulator?

[mustangII460]

The vacum modulator is at the right rear corner of the trans pan area. Make sure the vacum line goes to a good vacum source on the intake manifold. Usually its plugged into a vacum T at the back of intake.

The modulator will control your upshifts. The modulator is round looking shiny thing with the vacum hose directy into the center backside of it. To adjust the shift points your adjusting the vacum pressure. If you pull off the vacum line you can use a small flathead driver to turn the screw, the screw is what the line goes over. ONLY TURN 1/4 turns at a time, drive. Check EVERYTHING first!

Im willing to bet you have a vacum line loose/pinched somewhere. It sounds like it to me. Alot of times your tranny will also spit fluid out as well with the modulator not working.

If you replace the modulator DON'T lose the little pin/actuator inside of it. Carefully replace it with new mod.

[mustangman65_79]

Originally Posted by tbar12

What should I be looking at? How can I increase my bandwidth?

well, first u have to have a good connection, say, at least a cable, DSl would be too slow. Then agood computer, or even better yet a server would..........oh what, ur talking about cars............opps















lol