Hi guys;
Ok I've had the 72 on the road 2 yrs now and have developed a problem. At stops she doesn't like to down shift to 1st untill I let the brake off, then a hard dump to 1, or just as I touch the gas. I was leaning toward the vac mod being leaky? Cause if I do a crawl to stop it will shift to 1st with no notice and excelerate normally. This is just a recent ( last 2 mo.) developement. I thought if it was just a gov. problem it wouldn't operate normaly on a slow stop. Thanks for letting me pick your brains

 

Check the vac hose to make sure it is still connected at both ends and has no holes.




John

 

I think what you are experiencing is the diff rolling under braking and returning to normal position when the brake is let off. I had a similiar complaint when I was working for Ford and verified it by hanging out the door, looking at the diff under braking.

 

You're dead on, The slip yoke needed some lube and it has gotten better. Gonna take it apart and clean and lube it this weekend.
Thanks for the help!