Update on azkid's 1988 Burb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

arizona kid · 05-06-2004, 03:29 AM

Well drained the tranny and replaced the filter on my 1988 Burb hoping to get the thing out of first gear (th700r4). I had no probs with pan and fluid yet didnt fix the no-shift-into-2nd problem. So , I adjusted the TV cable from highest (towards firewall) to about where it was originally set when I bought it 8 days ago. I still feel there is a slight adjustment problem.......?? Or possiblly the valves are clogged from 4 wheeling here in dirty azz Arizona

So I may possibly use some detergent in new tranny fluid...what y'al think ?? Kevin

arizona kid · 05-06-2004, 03:34 AM

Oh forgot to mention, that every attempt at different settings on the adjustment of the TV cable didnt work after severaol test drives.

Grim Reaper · 05-06-2004, 11:24 AM

I don't know a lot about the 700 but that sympton on a TH350 would be either stuck valves or problem with the Govoner. I heard a 700, even manually put in first should shift out at some point was my understanding. It would do this to protect itself. That says that it's probably a stuck valve.

Does it have reverse? I think the common syptoms of them just "done" is no reverse and iffy 1st no OD.

What did the filter look like? Did it manage to suck a hole in the media and alow unfiltered fuild to run through it?

I'd start concidering dropping the valve body and cleaning it.

Krosati · 05-23-2004, 01:11 AM

We had a similar problem with a 90 th400. No upshift to 2nd.
Drive the truck about 10mph and quickly shift from drive to reverse. As soon as the reverse grabs, pull to neutral. If you kill the engine, it should be ok, just don't leave it in reverse.
This should unstick the valve.
Grab a quart of transX to swell the seals in your tranny. That's most like why the valve stuck in the first place.

05-06-2004, 03:29 AM	#1
arizona kid Registered User Join Date: May 2004 Posts: 11	Update on azkid's 1988 Burb Well drained the tranny and replaced the filter on my 1988 Burb hoping to get the thing out of first gear (th700r4). I had no probs with pan and fluid yet didnt fix the no-shift-into-2nd problem. So , I adjusted the TV cable from highest (towards firewall) to about where it was originally set when I bought it 8 days ago. I still feel there is a slight adjustment problem.......?? Or possiblly the valves are clogged from 4 wheeling here in dirty azz Arizona So I may possibly use some detergent in new tranny fluid...what y'al think ?? Kevin

05-06-2004, 11:24 AM	#3
Grim Reaper Registered User Join Date: Jul 2001 Location: Atlanta GA Posts: 1,704	I don't know a lot about the 700 but that sympton on a TH350 would be either stuck valves or problem with the Govoner. I heard a 700, even manually put in first should shift out at some point was my understanding. It would do this to protect itself. That says that it's probably a stuck valve. Does it have reverse? I think the common syptoms of them just "done" is no reverse and iffy 1st no OD. What did the filter look like? Did it manage to suck a hole in the media and alow unfiltered fuild to run through it? I'd start concidering dropping the valve body and cleaning it. __________________ Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project

05-06-2004, 03:34 AM	#2
arizona kid Registered User Join Date: May 2004 Posts: 11	Oh forgot to mention, that every attempt at different settings on the adjustment of the TV cable didnt work after severaol test drives.

05-23-2004, 01:11 AM	#4
Krosati Registered User Join Date: Jul 2003 Location: Texas Posts: 49	We had a similar problem with a 90 th400. No upshift to 2nd. Drive the truck about 10mph and quickly shift from drive to reverse. As soon as the reverse grabs, pull to neutral. If you kill the engine, it should be ok, just don't leave it in reverse. This should unstick the valve. Grab a quart of transX to swell the seals in your tranny. That's most like why the valve stuck in the first place.



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