Hi guys i have a 66 2 1/2 duce. i just had a air shift case installed and replaced the sprag that didn't work. i also installed a original pto winch on it which included installing the pto on the side of the transmission. Everything works great but now the truck dont shift down without grinding really bad!! i cant seem to figure it out, the pto is not engaged i checked thats what people said to check. ive been working on this for 2 months with no luck! any suggestions....
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shifting issues
- Thread starter levisaacs
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clinto
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1. Is the trans full of fluid?
2. Is the PTO properly shimmed?
2. Is the PTO properly shimmed?
machinist75
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What Clinto said about the shimming. About 90% of the time they need .020 worth of gasket shimming or they won't shift properly.
ptg530C
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Syncros shot.
steelandcanvas
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You're not trying to downshift to 1st, are you? Also, as Machinist75 and Clinto said, your PTO box might need shimming, they are right on the money.
phil2968
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Time to learn to double clutch.
clinto
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So what was it? Ever figure it out?
Ford Mechanic
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What is double clutching????
212sparky
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smart a$$... 
I thought it was one of those things like a muffler bearing.... no such thing. Guess I got edgucated today
Mike out for the weekend!!!!! We're going to the RODEO!!!!
I thought it was one of those things like a muffler bearing.... no such thing. Guess I got edgucated today
Mike out for the weekend!!!!! We're going to the RODEO!!!!
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If the Snycros are good then yes you are to tight on the gear. I use one thick gasket and one thin shim gasket and never had a problem being to tight.
Sorry guys for not getting back sooner. First of all yes to everthing said, we shimmed the case and it did not help, so we shimmed it again and it has made a big difference. ITs not as smooth as before all the modifications but manageable! thanks for all the help!
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What was the thickness of the second shim, I getting ready to do the same.
JC
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If I rember NAPA only offered two different sizes. There would be to many gaskets if that were the case so like I said there is a thicker one and a thin one. I don't know the thousands.
brianp454
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What exactly are you suggesting be shimmed? My truck doesn't have a PTO and sometimes find downshifting to engine brake difficult. Any suggestions for me?