700r4 issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**66gmcguy** · 07-19-2023, 07:35 PM

700r4 in my 83 blazer started acting weird. It was working completely fine but now for some reason, it won't shift from 1-2 unless I wind the RPMs way up. It's not slipping at all and it seems to be grabbing the gears just fine. 2-3 shift points are also raised a bit but no where near as bad as 1-2. OD doesn't come in until 60-65 when it used to be 45-50. The thing is, when the transmission warms up, it seems to shift normally. I've reset the TV cable at least 10 times with no change. The TV cable doesn't seem to be binding. I pulled the governor out and it seems to be working properly. Fluid level was checked while running in park and hot and it was at normal levels. Any ideas what it could be?

v30crewcab · 07-19-2023, 07:42 PM

sounds like the filter might be plugged up.

**66gmcguy** · 07-19-2023, 07:53 PM

Quote:

Originally Posted by v30crewcab

sounds like the filter might be plugged up.

The filter is less than 7 months old. Do you think it could have plugged up that fast?

Tiger Joe · 07-20-2023, 09:31 AM

do you have a pressure gauge? check what the pressure is in each gear. you can pick one up at harbor freight for like $40 if you dont have one.

even if the tv cable is adjusted properly, could be a stuck valve inside the valve body.

my 700r4 is toast, sitting in the bed of my truck for rebuild as i type this. i was battling very similar issues and in the middle of checking pressures i lost reverse. before reverse let go my pressures were crazy high, like double what they should be.

07-19-2023, 07:35 PM	#1
66gmcguy Senior Member Join Date: Oct 2014 Location: Bay Area, CA Posts: 346	700r4 issues 700r4 in my 83 blazer started acting weird. It was working completely fine but now for some reason, it won't shift from 1-2 unless I wind the RPMs way up. It's not slipping at all and it seems to be grabbing the gears just fine. 2-3 shift points are also raised a bit but no where near as bad as 1-2. OD doesn't come in until 60-65 when it used to be 45-50. The thing is, when the transmission warms up, it seems to shift normally. I've reset the TV cable at least 10 times with no change. The TV cable doesn't seem to be binding. I pulled the governor out and it seems to be working properly. Fluid level was checked while running in park and hot and it was at normal levels. Any ideas what it could be?

07-19-2023, 07:42 PM	#2
v30crewcab Registered User Join Date: Apr 2012 Location: Chatt Tn Posts: 987	Re: 700r4 issues sounds like the filter might be plugged up. __________________ 88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535

07-20-2023, 09:31 AM	#4
Tiger Joe Registered User Join Date: Mar 2015 Location: South of Pittsburgh Posts: 428	Re: 700r4 issues do you have a pressure gauge? check what the pressure is in each gear. you can pick one up at harbor freight for like $40 if you dont have one. even if the tv cable is adjusted properly, could be a stuck valve inside the valve body. my 700r4 is toast, sitting in the bed of my truck for rebuild as i type this. i was battling very similar issues and in the middle of checking pressures i lost reverse. before reverse let go my pressures were crazy high, like double what they should be.



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