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Tranny will not shift to third gear Bernie 10-5-03  
I have a 85 Southwind with a GMC454 and a 400 transmission. As I was driving it shifted to third then back to second. It will not shift to third any more. First to second shifts fine.The vacuum at the modulator seems ok.
Re: Tranny will not shift to third gear Chuck P30 10-7-03  
Call you local Transmission shop, IF you catch it soon enough you will svae lots o- clutch pack I am sure... Could be a few items, Such as stick valve and or spring in valve body, Could be clogged FILTER and thus loosing line presure Too many COULD BE's
Re: Tranny will not shift to third gear ROY 10-6-03  
I know what is wrong with your tranny
It cost me a 300.00 wrecker bill to find out that the plastic govenor gear is worn out it can be replaced from the outside and dont cost too much i bought one to fix mine and one to carry as a spare i know you still have reverse and low probally too
Re: Tranny will not shift to third gear Bernie 10-7-03  
Thanks Roy. I looked but all I could find was the gear for the speedometer. Is the gear you replaced in the same location? This is on the drivers side. The passenger side has the vacuum modulator. I do have reverse and first and second. They work smooth, no slipping or jerking.
Re: Tranny will not shift to third gear ROY 10-7-03  
If i remember correctoly it is under a small plate held on with 4 bolts the plate is about two and one half inches square and when you pull it off there is the plastic gear and it probally will show that the gear is worn out.
I sure hope this is your problem as it is simple to fix good luck
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