GMPPDEALER

iTrader: (1)

4l60e in my 2000 rcsb with a whipple 😜. Come up to a stop sign, it turns green, u take off and it revs up about 200 rpm and then just engages. It does it in OD,D, and 2 but not in low or 1st manually. Line pressure is 65+. So what ya think a guy should look at first?
Yes fluid is good.

clinebarger

Is this a riddle? Stop signs don't change colors....

GMPPDEALER

iTrader: (1)

Lights... My bad.

bbond105

In could be that the low roller clutch is not holding. When putting the trans in low the low/reverse clutches are applied, overriding the low roller clutch.

What is a rcsb?

GMPPDEALER

iTrader: (1)

Regular cab short box. Well that suxs.. That's internals.

bbond105

If the issue stops in manual low the only thing that I can think of that changes when in manual low is that the low/reverse clutches come on and override the roller clutch. The low roller clutch is a mechanical clutch that looks something like a roller bearing but will only turn in one direction. Yes it is an internal part.

jimmyblue

iTrader: (11)

This sounds like a high stall speed torque converter to
me. What's the problem? That you don't (think you)
have one?

mrvedit

I assume the OP is stating that this problem just started happening. And that "just engages" means its suddenly grabs and not a gradual process as with a high stall converter.

OP: This is why a more detailed description is needed for us to reach the most likely diagnosis.

GMPPDEALER

iTrader: (1)

No stall. No it ls not gradual, been doing it for awhile, in drive on flat ground with the brake off it won't roll forward until u give it 2-300 rpm. Then just takes off.

jimmyblue

iTrader: (11)

In this case I'd begin with fluid level; last TC swap, I
got the car back with about 3 quarts short and it kind
of behaved this way. Marginal pickup at the pump.