Question about 1994 Chevrolet Astro

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Can you adjust how quickly a transmission shift on a 1994 astro van, also after the tranny is in od and reaches 60 mph it starts and on and off vibration but it shifts fine with no slipping but shifts hard almost like it has a shift kit in it, and around 45 mph just after its in overdrive and you try and hold it steady between 45-50mph it starts to jerking

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Since this transmission is electronically controlled by shift solenoid's the first thing u must do here before starting any diagnostic is to have the trans electronic control unit tested for fault codes,then once u have those u start the diagnosis of the problem, and no the shift points are programmed into the computers memory, they can be changed in some cases if a program is available. Aamco transmission does the fault code test for free as well as the preliminary diagnosis and give u some clearer idea of what is causing the problem with the shifting.
My experience is 35 years as a factory trained service technican.

Posted on Aug 06, 2010

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1988 Chev. Van G30, auto. Trans., shifts fine from 1st to 2nd, but trying to go into high(3rd) gear takes a very long time getting into 3rd. gear. You can feel the holding back then after the speed picks...


Try using Lucas transmission fix. This product works great. Check your tranny fluid first (warm engine in park) it must be red and not black (contaminants) and not light pink and foamy (water), both require a visit to a transmission shop.
Before adding the Lucas, if your tranny level is normal, you MUST remove the same amount of tranny fluid as the amount of Lucas you are putting in. You can use clear plastic tubing that will fit into the fill tube and siphon it out. It could also be that your detent cable needs to be adjusted. You will need to get instructions on how to to this. It is fairly easy to adjust. It will be a cable connected to the throttle body.

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1 Answer

Transmission (1994 astro van ) shifts fine sometimes and other times feels like it stuck in 4th gear. i changed the filter and flushed the trans.Whats up with that?


Its more likely the tranny shift solenoids or the power wire going to the tranny. If the tranny loses its ignition feed (12Volts) it will default into limp home mode. This means neither shift solenoid has power and will be in the off position. When both shift solenoids are in the off position this is normally third gear. It will be very labored taking off from a stop being in third gear, but will allow you to still move (thus limp home). Astro vans were not known for it, however full size pickups with the same engine and tranny, would experience a bad ignition switch. It would disable the tranny circuit and no power would get to it, same symptoms. If it sometimes works it won't be a bad fuse, best to have it diagnosed at a reliable transmission shop to verify. Its not as expensive as a tranny overhaul.

Feb 26, 2011 | 1994 Chevrolet Astro

1 Answer

1994 Chevrolet G30 transmission problem


Its most likely the brake light switch, also connected to the steering column. It controls the Torque Converter Clutch, and when it is out of adjustment, it will not engage upper gears properly...The computer gets confussed and tries to protect the transmission.

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1 Answer

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I would check the fuild level and make sure the fluid is bright red. You may also want to replace the transmission filter. Also check the modulator, if so equipped.

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1 Answer

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Hello.
This a repair for a transmission shop. Sounds like the pumps are bad inside the transmission. Thats the worst option I have.
It also can be a poor shift linkage adjustment. And the last solution can be the speed module that tell the transmission when to shift.
Goodluck! I hope this helps!

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If your truck warms up in a normal amount of time, then you're all set.

Last year, my 4Runner started taking too long to warm up, so it wouldn't go into OD for a long time. In my case, it was that the thermostat was stuck open, so coolant was flowing freely even when the engine was still cold. Replacing the thermostat was quick and easy, and it's good as new again.

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Hello

A repair person could find theese really easy usually i have pulled a starter from tons of vans and even a astro and there usually a little hidden on the passenger side mounted on the side of the transmission if its not there then you may want to check the driver side of the tranny

scincerly Brian

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1 Answer

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