0
Why would a 1990 GMC Vandura 3500 w 57l automatic 80k miles have problems switching gears on the freeway and even downshift in higher speeds causing a racing engine?
I would check to see if there is any Vacuum hoses on the transmission.
On GM Trucks/ Vans there is a small pod on the side of the transmission that has a vacuum hose to assist in shifting esp for getting into the passing gear on the highway these hoses often break making a vacuum leak to the engine that would also make your engine race or idle too fast would be a better term. It will be obvious when you crawl under the van look on the side of the transmission around the pan depending on what type of transmission it is it could be in different locations. there are different automatic transmissions GM uses.
Look for a small round tin thing Called the Vacuum Modulator link below is a photo of a couple http://spacecoastfieros.com/tech/440-4T60/Modulator.jpg that is threaded into the transmission or bolted. if that hose is not broken at that end follow the hose up to the engine see if it has broken up there or it may have just come off for what ever reason.
That would be my guess and the first thing I would look for.
Hope that helps
If that isn't the problem then it could be something else possibly electronic if it is EFI. alternator wire disconnected could make engine idle fast on EFI.
What else can I help you with?
What automatic transmission is used in a 1990 GMC Vandura 3500?
The 1990 GMC Vandura 3500 typically uses the GM 4L80-E automatic transmission. This heavy-duty transmission is known for its durability and is often paired with the larger V8 engines found in the Vandura line. It features a four-speed design with overdrive, providing better fuel efficiency and performance compared to older transmissions.
What transmission in an 89 vandura with a v6?
The 1989 Chevrolet Vandura with a V6 engine typically comes equipped with a 4-speed automatic transmission, specifically the TH700R4. This transmission is known for its overdrive capability, which improves fuel efficiency during highway driving. It's important to verify the specific configuration, as some models may have different transmission options.
What type of transmission did your gmc g2500 vandura come out with?
The GMC G2500 Vandura typically came equipped with either a 3-speed automatic transmission or a 4-speed manual transmission, depending on the model year and configuration. The automatic transmission was often the Turbo Hydra-Matic, which provided smoother shifting and improved performance. The choice of transmission could vary based on the engine option selected and the intended use of the vehicle. Always refer to specific model documentation for precise details.
Where would You locate the ECM on a GMC Vandura 2500?
The ECM on the Vandura 2500 is under the Driver's seat.
What size motor doe a 1993 GMC Vandura 2500 have?
My 93' vandura has a 5.7 liter 350cubic inch engine.
What other trans will fit 95 gmc vandura?
For a 1995 GMC Vandura, compatible transmissions include the 4L80E and 4L60E automatic transmissions, which are commonly found in GM vehicles from that era. Depending on the engine and drivetrain configuration, you may also find compatibility with certain versions of the TH400 and TH350 transmissions. Always ensure that the specific transmission matches the engine and drivetrain requirements for a proper fit.
What type of freon does the 1995 GMC Vandura van take?
It does not take freon. The 1995 GMC Vandura uses the new R134a.
Can I get a manual on dropping in a rebuilt motor in Vandura 3500?
Hi: Have you an elctrical diagram for the cruise control of a Citation GMC 1985 (Vandura). Regards.
What transmission is in a gmc vandura 3500 6.2L diesel?
The GMC Vandura 3500 with a 6.2L diesel engine typically comes equipped with a Turbo-Hydramatic 400 (TH400) automatic transmission. This three-speed transmission is known for its durability and performance, making it suitable for heavy-duty applications. In some configurations, it may also feature a manual transmission option, but the TH400 is the most common pairing with the 6.2L diesel engine.
Is GMC Vandura a truck?
No, the GMC Vandura is a van. If you have the Starcraft conversion, the van is technically considered a station wagon for insurance purposes (much cheaper).
Where is the 91 vandura G2500 Instrument Panel Cluster Relay located?
The 91 Vandura G2500 Instrument Panel Cluster Relay is located on the dashboard.
What is the gross vehicle weight of a 1988 gmc vandura short school bus?
my 1992 vandura 6.2 diesel short bus weighs 10,000 lbs
