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#1 |
Registered User
Join Date: Mar 2016
Location: auburn new york
Posts: 71
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1971Chevy Pickup not shifting right
I think I have my engine RPM problem figured out. It is a three speed auto tranny. It seems like its only shifting first and second gear. I guess that would explain me running around 4K RPM's at 55 MPH. Any ideas why the tranny is not shifting up as it should? The vacuum line is hooked to the intake manifold and the tranny.
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#2 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,519
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Re: 1971Chevy Pickup not shifting right
Quote:
LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#3 |
Registered User
Join Date: Mar 2016
Location: auburn new york
Posts: 71
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Re: 1971Chevy Pickup not shifting right
not sure about the linkage. Truck doesn't have the transmission indicator on the column. How do you adjust the linkage?
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#4 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: 1971Chevy Pickup not shifting right
What about the kickdown cable at the carb? If that's disconnected and just pulled taught it'd never upshift, or not till very late. That's about all I can think of.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#5 |
Registered User
Join Date: Mar 2016
Location: auburn new york
Posts: 71
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Re: 1971Chevy Pickup not shifting right
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#6 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: 1971Chevy Pickup not shifting right
Transmission to carb.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#7 |
Registered User
![]() Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
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Re: 1971Chevy Pickup not shifting right
...have you checked your trans fluid/fill level?
If you are low on fluid it will not shift correctly or quickly. The level is often hard to read on the trans dipstick...but this is a quick check and fix if it is low. My two bits. Coley
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....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500 |
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#8 |
Registered User
Join Date: Feb 2011
Location: Modesto, CA
Posts: 2,188
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Re: 1971Chevy Pickup not shifting right
Everything said above, and do you know your rear end gearing? What's the story with the transmission? Where did it come from? Is it shifting soft, or firm right now? Does it lunge after it shifts?
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#9 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,553
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Re: 1971Chevy Pickup not shifting right
Kick down cable on a T350 does not affect up- shifting
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#10 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: 1971Chevy Pickup not shifting right
How does it work?
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#11 |
Registered User
Join Date: Jul 2001
Location: Youngstown, OH
Posts: 95
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Re: 1971Chevy Pickup not shifting right
Try starting in low gear and manually shift by hand and see how trans responds. Check trans fluid at running temperature with truck in gear with helper so no one gets run over or anything gets run into. Make sure modulator line is not leaking and any rubber on line is not cracked.
Not 100% sure but I think bad modulators will suck out trans fluid. |
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#12 |
Registered User
Join Date: Mar 2016
Location: auburn new york
Posts: 71
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Re: 1971Chevy Pickup not shifting right
You guys are the best!!!!!!!!!!!!!!!!!!!!!!!!! Cant thank you enough for your time spent with the less learned!!
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