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88 Chevy G20 Transmission Overdrive burnout?


Debbie Ann's Avatar
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02-21-02, 12:19 AM   #1  
Debbie Ann
88 Chevy G20 Transmission Overdrive burnout?

I have a 1988 Chevy G20 3/4 T. full-size van with 108,000 miles. Without warning, the transmission will not shift from 2nd to Drive/Overdrive. It will start in low, advance to 2nd, when it needs to shift into drive, it acts like it is in neutral. It is the same if I manually shift gears. I called a tranmission shop, told them the problem, and the shop said it is called "Overdrive burnout" and it needs a new/rebuilt transmission. The shop said this is a common problem with my transmission...I think it is a 700-R4. They also said I could drive it 'as is' without causing anymore damage, so that I could get to the store, etc., I just have to drive slow. I have never had a problem before this and I bought the van new. I cannot afford to replace the transmission. My questions: Does this diagnosis sound correct? Could it be something stuck, broken or missing and perhaps much less than the cost of a new trans.? Can I drive it (very slow) to get around until I can afford the new transmission? Approx. how much should it cost to replace my transmission? I appreciate any help and advise.

 
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Joe_F's Avatar
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02-21-02, 05:52 AM   #2  
Joe_F
Yup, internal failure. Common on an early 700R4 like this. 1989 and newer 700R4's had updated pumps. You don't mention when the last time the fluid and filter were done.

You can nurse it along because as the shop said, tranny replacement is the only option.

If the truck is good, save up your pennies for a rebuilt and get it done when you have the greenbacks to do it. If not, drive it until it doesn't go anymore and pitch it when it refuses to go .

 
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02-21-02, 07:25 AM   #3  
Debbie Ann
Thanks Joe....I was afraid this would be your answer....Does anyone have an idea of what I should pay for the repair? What about new vs. rebuilt? Perhaps a junkyard transmission? Anything else I should be aware of?? I appreciate all help and advise....thanks Debbie Ann

 
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02-21-02, 07:40 AM   #4  
Joe_F
Junkyard trannies are just that .

A good rebuild for this, installed is probably 800 to 1000 bucks.

It is worth spending the money if the rest of the truck is in good shape and it has been maintained. You can't replace a truck like this for a 1000 bucks.

The best option is a GM Goodwrench rebuilt unit which will include the latest updates, fixes and parts. It is probably the most expensive option though.

 
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02-21-02, 07:49 AM   #5  
Debbie Ann
Joe...the transmission shop said it would be $1,600 for the job....big difference...now what? I feel lost. This transmission shop is well known...not a hole in the wall. Any more advise??
:-)..thanks........Debbie Ann

PS I'm disabled and saving that much $ will take a very long time...anyone know if maybe charitable organizations help with this kind of problem? :-)

 
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02-21-02, 08:12 AM   #6  
Joe_F
Try a local independent repair shop and price around. They should be much more reasonable.

1600 is a little steep, even here in NY. That's a 1000 dollar job around here from what I recall.

Price it out with the chain shops (Ammco, Lee Myles) and see how they compare.

You can try a used transmission, but it is a gamble without a doubt, so be prepared to eat the labor twice and it may not last .

 
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02-21-02, 05:07 PM   #7  
mooser1
Joe is right about talking to an independent mechanic.....

although there is a possibility the tranny is shot, there are also several other things that could cause your problem...I would speak to a mechanic and see if it might be something simple, linkage fallen off or out of adjustment, modulator valve gone bad, vehicle speed sensor faulty or unplugged, etc.

I would have these external possibilities checked to verify whether or not it's indeed "toast" as Joe would say....most tranny specialists will tell you it's shot so they can sell you a rebuild, find someone you can trust to check out all the possibilities before spending your dough unecessarily.....

just a thought....

 
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02-22-02, 12:02 AM   #8  
Debbie Ann
Thanks so much for the info....Joe and moosser1....AAmco is the one that said $1,600 without even seeing it. My good friend thought the same as you moosser1, he said I should find out if it was something that could be repaired without having a new tranny. That is why I asked in my orginal post about it being something other than a new tranny.....you both haved helped me a lot...I appreciate it...Thanks....... Debbie :-)~~

 
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02-22-02, 03:39 AM   #9  
Joe_F
Low or dirty fluid will also cause this.

If ya tell me you can't remember the last time you changed the fluid and filter, the trans is likely wiped .

When the fluid overheats, the clutch pack material breaks down and it goes south.

Try changing the fluid and the filter and see if that helps.

 
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02-22-02, 06:22 AM   #10  
Debbie Ann
I will !! Thank you so much Joe....

 
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02-22-02, 07:16 AM   #11  
Joe_F
Ok then, let us know what you find....

 
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