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06-07-2020, 12:27 AM
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#1 |
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Registered User
Join Date: Jan 2012
Location: Portland, OR
Posts: 37
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Transmission won't upshift
Hi, guys and gals! I can't believe it's been 8 years since the last time I logged in to this Forum!
Well, my transmission started acting up. It won't upshift or downshift properly. This happened quite suddenly one day after I stopped for gas, then seemed to fix itself, and then a few weeks later stopped shifting properly for good. I haven't been driving it for about a year, but the other day I had to use it, couldn't be avoided. I found that if I left the line at around half throttle, the trans will upshift to 2nd at about 35 mph, and to 3rd at about 55 mph, just as if I was punching it into "passing gear." It never shifts to 4th, and on stopping, won't downshift to 1st unless I select Neutral, and then back to Drive. The trans is a 700R4. Any ideas what might be wrong? |
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06-07-2020, 12:39 PM
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#2 |
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Registered User
Join Date: Jul 2018
Location: Bluffton, SC
Posts: 59
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Re: Transmission won't upshift
Have you checked the fluid?
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06-07-2020, 08:20 PM
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#3 | |
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Registered User
Join Date: Sep 2019
Location: Scottsdale Arizona
Posts: 114
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Re: Transmission won't upshift
Quote:
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06-08-2020, 12:30 AM
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#4 |
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Registered User
Join Date: Jan 2012
Location: Portland, OR
Posts: 37
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Re: Transmission won't upshift
Thanks, guys. The fluid level is good, and I had it and the filter changed 5 years ago, and I've put about 15K miles on it since then. I checked it first thing when this problem appeared. I have not been under there to physically check anything.
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06-08-2020, 08:48 AM
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#5 |
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Registered User
Join Date: May 2016
Location: Willow, Alaska
Posts: 869
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Re: Transmission won't upshift
Governor gear stripped/unit sticking?
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06-09-2020, 10:48 AM
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#6 |
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Registered User
Join Date: Jan 2012
Location: Portland, OR
Posts: 37
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Re: Transmission won't upshift
I have not been under there to physically check anything. This week I will. The TV cable and governor are the first 2 things...I just thought someone else might have experienced the same thing...
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06-11-2020, 03:43 AM
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#7 |
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Senior Member
 
Join Date: Jul 2000
Location: North Texas
Posts: 3,465
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Re: Transmission won't upshift
Job #1 is to make sure the TV cable has no slack at the carb linkage. It's even OK to have just a slight bit of tension on it. It's absolutely necessary for the cable to start moving immediately when the throttle starts to open.
Check it with the choke open, so the throttle lever is not cocked slightly open by the fast idle cam.
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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06-11-2020, 01:46 PM
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#8 |
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Registered User
Join Date: Jan 2012
Location: Portland, OR
Posts: 37
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Re: Transmission won't upshift
OK, thanks. I don't suppose anyone here has a factory service manual for this truck in digital format?
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06-11-2020, 08:37 PM
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#9 |
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Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,465
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Re: Transmission won't upshift
Service manuals: http://67-72chevytrucks.com/vboard/s...d.php?t=545416
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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06-12-2020, 09:46 AM
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#10 |
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Registered User
Join Date: Jan 2012
Location: Portland, OR
Posts: 37
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Re: Transmission won't upshift
Wow...that's amazing! Thanks much!
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06-12-2020, 03:58 PM
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#11 |
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Registered User
Join Date: Jan 2012
Location: Portland, OR
Posts: 37
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Re: Transmission won't upshift
Well, I messed with the TV cable, and at closed throttle it seems very loose, but pulling on it and snapping it like a guitar string made no difference; however, it seems like it's the #1 suspect, with the governor being 2nd, and then big problems follow that... I appreciate those manuals. Very kind of you.
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