(800) 853-2651
SHOP NOW

Tranny not up shifting

E

El Toro

Well-known Member
I have a 1981 Mercury Cougar just started not upshifting. Is there a vacuum solenoid modulator used? It will up shift eventually and stays there until you slow down to a crawl or stop. It has that automatic overdrive, but I don't use that since it's too hilly and traffic is terrible. Hal
PS: It only has 56k miles. It has the 302cid engine.
 
(quoted from post at 19:17:51 10/18/12) I have a 1981 Mercury Cougar just started not upshifting. Is there a vacuum solenoid modulator used? It will up shift eventually and stays there until you slow down to a crawl or stop. It has that automatic overdrive, but I don't use that since it's too hilly and traffic is terrible. Hal
PS: It only has 56k miles. It has the 302cid engine.
Click to expand...

When I've run into that problem(
not that often) it has nearly always been modulater related.
 
It could be the C5 which is a modified C4 with a centrifugal converter clutch. Modulator would be a first guess then the fluid.
 
Hi Guy,

At the carburetor throttle, see if that TV control rod, which goes down to the transmission, is still connected. Oftentimes, those flimsy little clips will come off.

If it is still in place, go underneath the car to check the lower end, which connects to the 'inner' shaft of the manual shaft.

Allan
 
Thanks for all the replies. I had 2 other vehicles that had the same problem. It was always the modulator. The first was a 1959 Rambler Rebel wagon. Had to several shops and first said it needed the oil changed. It never helped. The Rambler shop said it was shifting normal and I told him it never took that long before. The owner of the Rambler had a son that taught auto shop at the local community college and I knew he was a first class mechanic.
He also raced Nash cars back in the late 1940's and 1950's on dirt tracks. The Fords always out ran the Nash. I ask him about the late
upshifting. He said it was the modulator. The same mechanic that told me it shifting normal replaced the modulator. That fixed the problem.
The other vehicle was a 1979 Chevy P/U. I found the vacuum line needed replacing to the modulator. I was a lot younger back then, when you're approaching 80 I don't like crawling around on that creeper. Hal
 
Oh for sure.

And 'sides that, you could be under there for days, weeks.......heck, even years trying to find that vacuum modulator.

You have the AOD transmission if it's an overdrive. They use a throttle valve in leau of a modulator valve.

See if that carb linkage is hooked up properly and we'll go from there.

Allan
 
You must log in or register to reply here.
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top