Turbo 400 question?

1981 Chevy 4x4 3/4ton.350/400

Lately I have been delveloping a hard shift, after I have been driving the truck for a while, within normal operating temp, If I try to go into reverse it feels like it shifts really hard, loud noise, and a huge clunk! Only in Reverse though, and when the truck is cold it shifts just fine, any thoughts?
Blzn74
 

John DiMartino

PlowSite.com Veteran
Location
Walden,NY
make sure the vacuum modulator is hooked up,and you may need a new one,it sounds lie its not getting vacuum or is bad.are your shifts a little late too?
 

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