Transmission slipping in overdrive - 1996 Plymouth Grand Voyager

Hi Scott, The link below is a youtube video showing how to fix your transmition, I hope this helps......CHEERS''

Auto Transmission Problem
https://www.youtube.com/watch?v=WjNbeInU6-4

Fixing Transmission That Slips And Clunks

Clutch pack, s burnt out will have to be replaced.

Either the transmission is shot completely or the filter is clogged and needs replacement and new fluid added

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_677dced97ad9bddf

Roger, that doesn't even make a whole lot of sense to me. If the overdrive is causing the transmission to slip, wouldn't it also cause the fuel mileage to go down? Are you sure the transmission is slipping? Or is the transmission simply shifting in and out of overdrive? If it is, is it shifting at the proper speeds? Driving at around 40 - 50 Mph will sometimes make the transmission go in and out of overdrive repeatedly. This can be perfectly normal.

Have you checked your transmission fluid level?

Is your overdrive off light flashing? If the transmission is actually slipping the OD OFF light should be blinking at you to let you know there is a transmission problem. Either that, or the Check Engine light will be coming on. In either of these cases, you need to scan your onboard computer network for possible fault codes.

P1744 - Torque Converter Clutch System Stuck in Off Position.

Either way the problem points to an internal transmission problem.
1. Drive it and see if the codes come back, and see if it is slipping in overdrive.

2. Check the transmission pressure in drive, with the overdrive on and the transmission slipping.

These transmissions have a high failure rate. Have seen internal transmission slippage that showed up in drive with the Overdrive (OD) switch on, but not with the OD switched off. It was related to the coasting clutch being on and off in that range. In that case, there was an internal mechanical transmission problem. We recommend a rebuilt transmission from the dealer and an external transmission cooler - the new rebuilt transmission will last longer.

Good luck (remember to rate this free answer).

You should not use overdrive unless you are steadily going highway speeds. I had one of those and my ex liked to use cruise control on windy coastal roads. This caused it to shift back and forth from 3rd to overdrive constantly. So I disconnected the cruise control so he couldn't use it. Lol. I'm not suggesting this for you. You should keep overdrive off for now and have your transmission serviced. New filter & oil & flush the cooler. Make sure you ONLY USE THE RECOMMENDED FLUIDS!!!!!!!!!! See if that helps. Do not use overdrive pulling a trailer and going up a hill and do not use it if you are on windy roads where you are slowing down alot of times. Try letting off the gas for a second when you do want to engage the overdrive. Remember to always check your automatic tranny fluid with the engine running and fully warmed up.

I’m happy to assist further over the phone at https://www.6ya.com/expert/kim_3202917d7c587455

No,1 quart won't cause slipping

A bad lock-up Solenoid or Worn Converter Clutch, Might

OD is another issue

ANY SLIPPING-and you will be completely
rebuilding it ,in a couple months

sorry to say this trans has to be removed and rebuilt seems like od clutches burnt out-do you tow heavy trailer with truck as you have to tow with od off(push button on shifter)

well the low cost way to go first would be to try and change the trans fluids. If the problems still remains the it may be an internal problem

you may have damaged the overdrive gear, a local transmission shop would be your best bet. for good troubleshoting and estimate.