1990 740 Turbo Auto trans shifting issue

5ft24 · Post by **5ft24** » 03 Nov 2015, 10:31

My trans has solid shifts, Fluid not burnt.
Symptoms:1-2 shift normal speed. 2-3, hangs in 2nd until I almost completely take my foot off the gas. 3-4 quick. 4-3 downshift with very little throttle.
Throttle cable to trans has been backed off almost as far as it can go.
Ideas?

lummert · Post by **lummert** » 03 Nov 2015, 15:53

Probably related to the kick down cable.

5ft24 · Post by **5ft24** » 03 Nov 2015, 18:50

lummert wrote:Probably related to the kick down cable.

It has been adjusted by the manual's procedure, and even backed off a TON to see if it made any difference... None with the 2-3 shift. and manually pulling the cable there isn't any binding or sticking

lummert · Post by **lummert** » 03 Nov 2015, 22:16

While reading about adjusting the kickdown cable (I recently had an issue with shifting on my 1988 760 Turbo Wagon) I noticed mention of first checking the adjustment of the throttle linkage.

93Regina · Post by **93Regina** » 05 Nov 2015, 18:18

5ft24 wrote:...manually pulling the cable there isn't any binding or sticking

Did you make or install an OD shift plate via removing solenoid?

5ft24 · Post by **5ft24** » 06 Nov 2015, 11:09

93Regina wrote:
5ft24 wrote:...manually pulling the cable there isn't any binding or sticking
Did you make or install an OD shift plate via removing solenoid?

Nope. Haven't touched the trans itself. I am planning on doing a fluid/filter change when the weather lets up a little here. Just because I don't know when it was ever done.

lummert · Post by **lummert** » 06 Nov 2015, 13:08

No need to replace the filter screen. Just remove the drain plug to drain the pan (holds about 4 quarts). Replace with new dexron lll fluid . Do a fluid flush if needed.

93Regina · Post by **93Regina** » 06 Nov 2015, 15:47

5ft24 wrote:Haven't touched the trans itself.

Push the OD button several times, when driving.

There is a higher viscosity transmission fluid...which might be a good idea.

5ft24 · Post by **5ft24** » 07 Nov 2015, 10:51

Is Dexron III still available, or has it been completely replaced with the Synthetic Blend Dexron V or VI?

lummert wrote:No need to replace the filter screen. Just remove the drain plug to drain the pan (holds about 4 quarts). Replace with new dexron lll fluid . Do a fluid flush if needed.

93Regina · Post by **93Regina** » 07 Nov 2015, 12:21

5ft24 wrote:Is Dexron III still available

Technically speaking, NO; GM does use it any more.

MAXLIFE™ DEX/MERC ATF*