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Author Topic: 1987 Automatic Trans. Adjustment ?  (Read 10422 times)
408ciw
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« on: February 27, 2015, 06:02:44 pm »

I bought a 87 Gt with a auto trans, the seller told me the TV cable needs to be adjusted. The problem is it will not shift into O/D . If I shift it to O/D engine just revs up I have to put it in D.  Is the trans junk or does it need adjusting. If anyone has a adjustment procedure that would be great.

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Joel5.0
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« Reply #1 on: February 27, 2015, 07:42:17 pm »

OD clutches are gone, kaput, burnt. I'm sorry
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Nate_135
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« Reply #2 on: May 01, 2015, 01:28:11 pm »

The overdrive BAND is probably gone, or the servo isn't applying for some reason (leaking, stuck, etc.) The o/d band is a notorious weak point of stock aod's.
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97 ranger, 2wd, Stock 302 shortblock, 10:1, Vic JR, TW170, QFT 650, 1 3/4 x 3 L/T's, header evac, homebrew AOD/4R70W, Precision converter, 325/40/17 DR's, Cal-tracs. 3450#.
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« Reply #3 on: May 03, 2015, 09:18:55 am »

Ditto, the OD band is the weakest link, and it only runs OD. The direct clutches power both 3rd and 4th gears, so if the 3rd gear is still relatively solid, you may have only lost the OD band.

Adjust the TV pressure up, more pressure is helpful. Over time the cable stretches, which lowers the TV pressure. Always replace the TV cable grommet, and use the brass version instead of the poor stock plastic one.
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Don

1991 Mark VII LSC Special Edition, soon to be OBDII and 4R70W, then GTC body kit and 347.
1998 Mountaineer, plans for A4WD and KB 2200 blower later, XP8 parts, paint and a 332.
1973 Ranchero and 72 Sport front end ...will be a 351 Clevor, EFI and 4R70W.
408ciw
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« Reply #4 on: May 03, 2015, 10:38:45 am »

The AOD is new to me so if you could explain how to adjust the TV cable and/or pressure.
Thanks
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CDW6212R
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« Reply #5 on: May 03, 2015, 09:30:20 pm »

First check the TV cable grommet at the throttle body. If it's not attached there then don't drive the car at all until you put one there. If the one there is plastic, begin first by buying a new one. A plastic grommet often breaks when you remove the adjustment block from the TB(you have to do that to make each adjustment). Buy a brass TV cable grommet, those will last forever and are easier to install etc.

The TV cable pulls on the TV valve inside the trans valve body. It adds pressure to the internal main system, it's required. The cable stretches with old age, slightly, and that reduces TV pressure(bad).

So get the grommet condition reliable, and then begin to carefully raise the TV pressure(shorten the cable effective length).

Be sure to mark the cable before loosening the adjustment block. It's a plastic square shaped cable at the TB end, with lots of tiny teeth which the adjustment block engages(hold onto). Gently mark the cable to the side of where the teeth enter the adjustment block.

Then when you release the tiny plastic lock inside the adjustment block, the cable will quickly move(there's a spring there which will make it move). You need that mark/line on the cable to reference where it began at, so you can properly move the cable forward into the adjustment block more(that makes the cable shorter and raises the TV pressure).

When you do drive the car, if the trans shifts to higher gears really early/soon, the TV pressure is too low and you should stop driving it ASAP, and adjust the TV pressure up more. I'd begin by making a 1/4" adjustment(shorter cable). You'd rather find that the shifts are too hard and/or later(more rpm), than have it shift too early(and soft(more slipping)).

A typical stock AOD vehicle(gearing) should shift down quickly from 3rd(at a steady 30mph), to 2nd with little throttle pressure. A low TV pressure will make that down shift slower, more delayed(less responsive).


At the adjustment block, which is where the TV cable and grommet meet, you have to disconnect it from the TB before you can loosen the tiny plastic lock to allow an adjustment. Any very small screwdriver or pick etc, will be able to push the plastic lock a little. It comes out of the top about a 1/4" at most to release the cable. So you press it upward from the bottom side of the adjustment block. I think all of those blocks are black, and the locking "pin" is a white or kind of clear color. If you didn't push the lock pin back in, it would be forced back in when the block is reattached to the TB(into the grommet).

But you want to gently get the adjustment block in your hand, slightly away from the TB. It will spin around the cable with no resistance, the top is the part with the pin that sticks up to go into the TB. Get the cable marked well before releasing the tiny locking plastic pin going through it. You don't want to try to push the pin out all the way, just the small amount to make it let go of the cable, which will quickly make it move along the cable. So you have to have the cable marked before loosening the adjustment block "pin."

Move the block in your had along the cable and line up the mark you made with the block, to where it was, and then move it back over the cable(makes the effective length shorter), the amount you want to adjust it. Hold it where you want it there, and then with a finger press the release/locking pin back in(down from the top). That locks your chosen length in, and you can then push the block back into the TB grommet. Then take a new test drive, decide if the shifting is higher/firmer, too little, or too much etc.

Since you have an OD issue, don't ever place the shifter in that OD position right now. Sort out the TV pressure first, you can do that with 1st-3rd gears easily. Then and only then is it worth the risk to try OD once again, after you know the TV is set right.

A VB kit often fixes most inherent or existing issues with shifting, unless the damage is already too far along.
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Don

1991 Mark VII LSC Special Edition, soon to be OBDII and 4R70W, then GTC body kit and 347.
1998 Mountaineer, plans for A4WD and KB 2200 blower later, XP8 parts, paint and a 332.
1973 Ranchero and 72 Sport front end ...will be a 351 Clevor, EFI and 4R70W.
Nate_135
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« Reply #6 on: May 05, 2015, 09:26:10 am »

Easiest way to set TV is to put a gauge in the TV port of the trans, set it to 3-5 psi at idle. I wouldn't recommend setting it by feel until you KNOW you have 3-5 psi at idle... As far as the overdrive goes, this doesn't sound like a TV issue, this is servo or band.
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97 ranger, 2wd, Stock 302 shortblock, 10:1, Vic JR, TW170, QFT 650, 1 3/4 x 3 L/T's, header evac, homebrew AOD/4R70W, Precision converter, 325/40/17 DR's, Cal-tracs. 3450#.
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