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  #1  
Old 11-25-2003, 09:10 PM
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Join Date: Feb 2002
Location: Monroeville, NJ
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Unhappy Transmission only shifts at high rpm's

I tried a search for this problem, and it seems to either the b2 piston, the vacuum modulator, or the bowden cable. My 1986 560 SEC sat for about two months without use until I replaced one of the fuel pumps. Now, for some reason, it won't shift into third below 2,200 RPM, or into 4th below 2,800 RPM. The fluid level is fine, and I plan to have the fluid and filter serviced. Has anyone had a similar problem? I tried changing the linkage throw to the bowden cable, but it had no effect. Any suggestions would be greatly appreciated.

Max
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M. Sandler

1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man)
1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great!
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1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right.
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  #2  
Old 11-25-2003, 09:14 PM
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Max

If you are sure the ATF and all are good, I would guess it is a bad vacuum modulator on the side of the trans .... or the vacuum connections to it.

Soemone posted a similiar complaint and it turned out to be the rubber tube between the vacuum line and the vacuum modulator. Hard and brittle, was the description.

Haasman
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  #3  
Old 11-26-2003, 07:31 AM
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Join Date: Feb 2002
Location: Monroeville, NJ
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Thanks, Haasman. I happen to have a new vacuum modulator that I was going to use in my 560 SL. I think its the same for the 560 SEC, so I'll try installing it and see if it helps. What are the symptoms associated with the b2 piston? Given the year of the car (1986), it would seem to be susceptible to this problem also. God, I wish I had been born rich instead of good-looking (LOL).

Max
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M. Sandler

1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man)
1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great!
1997 GMC Jimmy: Turned out to be a turkey.
1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right.
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  #4  
Old 11-26-2003, 08:33 AM
TX76513's Avatar
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Join Date: Apr 2003
Location: Brandon, Mississippi
Posts: 5,164
Here is a link that is probably everything you need to know about B2 Pistons and some good transmission stuff. Scroll down to transmissions.
TRANS
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