c4 woes

Alrighty, So I think my tranny is on its last leg...

here are my symptoms,

When car is cold, hasnt been driven for atleast 4 hours, when put into drive, if i hit a bump, or step on the brakes, the transmssion looses line pressure and comes out of gear.. (transmission is full of fluid)

When sitting at a stop light in drive, or 1'st i have to put excessive pressure on the pedal to hold the car stopped, normal pressure can be applied if i have the car stopped in 2nd gear (idle is set to 850 in park)

When shifting from 2nd - third it will give me a big slip..

I know the slipping third gear shift is a typical c4 issue, what about the other 2?

i have a fully built reverse manual valvebody C4 mated to my other high horsepower motor but it has a 3500 stall, so i am reluctant to swap those two trannys untill i can afford another converter..

Is there anyhting i can do to prolong the life of this tranny, or deal with mainly the loosing line pressure when cold issue?
I just want to limp it into winter...

fluid is a red, no smell of burnt, it dosent slip out of gear, it looses line pressure and dis'engages out of drive/2nd/1st, you bring the rmp up a couple times and clunk back into gear.. engine/tranny are on solid mounts..

it slips into third almost all the time, sometimes it will have a good day and shift hard for a bit..

sorry guys, added a buncha lucas tranny fix type **** and it stopped loosing pressure cold, but it still slips going into 3rd horribly, and feels like seccond dosent quite have the grab anymore.. its on its way out..

So, I want to build a c4 That rattles my teeth, breaks my back, and and knocks my head off the roll bar when it hits seccond and third gear.. what do you guys reccomend internals wise?