I've changed T.C.M. TRANSMISSION FILTER and still having problems.the van does drive but on take off I have to rev the engine real high for it to move,but moving it goes just fine,only on take off is the problem.I was told it could be the low pressure pump,but it does have reverse. PLEASE HELP

i've changed T.C.M. TRANSMISSION FILTER and still having problems.the van does drive but on take off i have to rev the engine real high for it to move,but moving it goes just fine,only on take off is the problem.i was told it could be the low pressure pump,but it does have reverse. PLEASE HELP

https://www.askmehelpdesk.com/cars-trucks/when-asking-about-your-vehicle-303903.html

A little more about your vehicle, please.
As well as any inspections/repairs you've done so far...

1990 plymouth voyager 3L engine

Which trans option, too: 3 or 4 speed auto?

Here's a brief list of some of what can cause your problem:
-Worn or faulty underdrive clutch.
-Damaged clutch seals.
-Worn or damaged accumulator seal rings.
-Incorrect gearshift control linkage adjustment.
-Worn or broken reaction shaft support seal rings.
-Worn or damaged input shaft seal rings.
-Valve body malfunction or leaking.
-Hydraulic pressures too low.
-Faulty oil pump.
-Clogged oil filter.
-Low fluid level.
-Aerated fluid.
-Engine idle speed too low.

If you're not familiar with transmission diagnosis and repair, I'd recommend letting an experienced transmission shop take a look at this and share their feedback with us for a second opinion.