Trany Problem...Wont move in D

[pearlm30]

I did some search and found nothing regarding to this trany problem.
Just got this 95 SVX about 145,xxx miles with trany problem.
When shift into D, nothing(I couldnt feel the engagement and when I hit the gas, it just rev up as its in N). same as 3. But when I move the shifter to 2 or 1, it would engage and drive. When speed reached about 30, I then move the shifter to 3 and then D and everything is fine including the TC locking at proper speed.
Reverse is woking properly.
The trany fluid is dirty but at full mark. I also disconnect the resistor to see if it would make any difference(no difference at all).
Any suggestion?
Thank you

[Trevor]

Originally Posted by pearlm30

I did some search and found nothing regarding to this trany problem.
Just got this 95 SVX about 145,xxx miles with trany problem.
When shift into D, nothing(I couldnt feel the engagement and when I hit the gas, it just rev up as its in N). same as 3. But when I move the shifter to 2 or 1, it would engage and drive. When speed reached about 30, I then move the shifter to 3 and then D and everything is fine including the TC locking at proper speed.
Reverse is woking properly.
The trany fluid is dirty but at full mark. I also disconnect the resistor to see if it would make any difference(no difference at all).
Any suggestion?
Thank you

Your description is rather confusing. Please confirm.

If you select D on start up there is no drive?

Same in 3, if you select 3 on start up there is no drive?

When either 2 or 1 is selected it will engage and drive. Will it shift from 1 to 2 automatically after take off and speed is gained?

When speed reached about 30, I then move the shifter to 3 and then D and everything is fine including the TC locking at proper speed.
Reverse is woking properly.
Presumably making the shifts manually after 2 has been engaged.

On the basis of what you say, the fault is confined to automatic selection functions, which causes one to suspect faulty speed sensing or information signalling.

First off run a check for both transmission and engine codes and advise the results. Instructions available within the how too section.

[pearlm30]

Just an update
When the car is cold(sitting for over 5 hours, the trany would shift fine). Once it warms up(turn off the car after 3 or 4 miles of city driving, upon restart, the trany is acting up again)
And sorry about my description

If you select D on start up there is no drive? YES

Same in 3, if you select 3 on start up there is no drive? YES

When either 2 or 1 is selected it will engage and drive. Will it shift from 1 to 2 automatically after take off and speed is gained? YES

When speed reached about 30, I then move the shifter to 3 and then D and everything is fine including the TC locking at proper speed.
Reverse is woking properly.
Presumably making the shifts manually after 2 has been engaged. YES

Will check if any code present.
Thanks again for the help!

[oab_au]

Originally Posted by pearlm30

I did some search and found nothing regarding to this trany problem.
Just got this 95 SVX about 145,xxx miles with trany problem.
When shift into D, nothing(I couldnt feel the engagement and when I hit the gas, it just rev up as its in N). same as 3. But when I move the shifter to 2 or 1, it would engage and drive. When speed reached about 30, I then move the shifter to 3 and then D and everything is fine including the TC locking at proper speed.
Reverse is woking properly.
The trany fluid is dirty but at full mark. I also disconnect the resistor to see if it would make any difference(no difference at all).
Any suggestion?
Thank you

There is a difference in the power flow through the gearbox in 1st gear in Drive, and 1st selected by the shifter.
When it is in Drive 1st gear, the 1st/2nd one-way clutch takes the power flow. When it is in 1st Selected, the Low/Reverse brake is used.

So I would say that the 1st/2nd one-way clutch is slipping. As it is a Sprage type, it will need replacing, and the box has to come out to do it.

You can continue to drive it as you are doing, selecting 2nd with the shifter to start, then moving it to D to pick up 3rd. Of course you will have to select 2nd again when you slow down or stop.
Sorry about that.
Harvey.

[Trevor]

pearlm30, special thanks for the update and confirmation.

I note that if you select 1 the car will drive.

If you select 2 the car will drive and shift from 1 to 2 automatically.

Only when a speed of about 30 MPH is reached and D is selected, will shifting progress through 3 and into D and then all is normal.

Therefore you confirm that first is engaging correctly when selected via the shifter. Also that first is engaging correctly when second is selected from rest, so that first is engaged automatically to be followed by second.

I am not sorry to say that there is no indication that the one way clutch is slipping. What is more at this stage there is no indication that the transmission will have to be removed.

The symptoms as you have reported, at this stage do not look ominous. My original diagnosis regarding possible causes stands.

As a matter of interest, two arrangements are provided for first speed, such that manual selection of first, specifically provides engine braking for tricky situations.

[pearlm30]

Thank you everyone
I took the trany pan off and there are a lot of metal shavings and dirt paste. I will put in a new internal filter and install a trany cooler tomorrow(mainly to bypass the radiator cooler in case its blocked)while letting the trany drain over night.
I read some of the trany slip related threads and found out I can use Ford type F fluid and the Lucas trans fix to increase fiction(less slip)
I know the trany is most likely toasted and just curious if the trany drain and magic fluid would fix it.
Thanks again and I will report back.

[Trevor]

Originally Posted by pearlm30

Thank you everyone
I took the trany pan off and there are a lot of metal shavings and dirt paste. I will put in a new internal filter and install a trany cooler tomorrow(mainly to bypass the radiator cooler in case its blocked)while letting the trany drain over night.
I read some of the trany slip related threads and found out I can use Ford type F fluid and the Lucas trans fix to increase fiction(less slip)
I know the trany is most likely toasted and just curious if the trany drain and magic fluid would fix it.
Thanks again and I will report back.

I am now more than confused as at no time within your reports of a fault, have you previously mentioned "trany slip".

[oab_au]

Originally Posted by pearlm30

Thank you everyone
I took the trany pan off and there are a lot of metal shavings and dirt paste. I will put in a new internal filter and install a trany cooler tomorrow(mainly to bypass the radiator cooler in case its blocked)while letting the trany drain over night.
I read some of the trany slip related threads and found out I can use Ford type F fluid and the Lucas trans fix to increase fiction(less slip)
I know the trany is most likely toasted and just curious if the trany drain and magic fluid would fix it.
Thanks again and I will report back.

Yes give it a go if you like. Stranger things have happened.

The type of clutch that this is, does not have fiber linings, that the additives help.
The Sprage(Sprag, Sprague) is like a roller bearing with metal fingers that lay down and slip when turned in one direction, and stand up to lock it when rotated in the opposite direction. There is a chance that the fingers are goo-ed up in their cage, so that they don't stand up when they should. This usually makes them slip when cold, work when hot. As yours displays the opposite, I don't think it this is your case.
But when all else fails, try anything.
Harvey.

[crazyhorse]

If it can be manually shifted into every gear, and pull. This doesn't sound like a mechanical fault. It sounds electronic.

Cleaning out the pan, and replacing the filter can only do a world of good. Before you change from DexIII, and go adding LSD additives, PLEASE try it with fresh, clean dexIII. You do NOT want to be changing trannies on these cars. They're WAY EFFIN' HEAVY!

As it sits, your trans isn't doing anything that would indicate you need to change it. Your TCU, on the other hand IS acting flaky.

Adding the LSD goop is a last ditch effort to save a trans that's a goner already.