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04-21-2008, 06:54 PM
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#1 (permalink)
| | Junior Member
Join Date: Apr 2008
Posts: 2
|  Tranny Shift Problems
I have a 79 thunderbird with the 429 motor and tranny out of a 69 mercury, the transmission won't shift untill the engine is at 3700rpm, I tried to look at the kickdown linkage to see if it was stuck, but all is well.
I want it to shift at 2500 like normal trannies, does it have some sort of shift kit or stall converter in it and what do I have to get to get it back to normal.
its a 3 speed trans and I want to not drive the @$$ off it to get it to change gears. | 
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04-21-2008, 07:00 PM
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#2 (permalink)
| | Moderator
Join Date: Sep 2007 Location: central illinois
Posts: 1,706
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Check your vacuum modulator on the side of the transmission.
__________________
93 Thunderbird 5.0 HO
89 Firebird L03
95 F150 XL
Get ready for the 351 boss build this summer, 4v closed chamber heads, 2.25/1.75 valves, .750 lift, 12.5:1 piistons, wieand tunnel ram, nitrous, I think its gonna roar!
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04-21-2008, 07:18 PM
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#3 (permalink)
| | Junior Member
Join Date: Apr 2008
Posts: 2
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I can check my other motor sitting on the floor, its a motor and tranny out of a 64, I know the trany shifted well so i'll see if I can find this vaccume thing and switch it over, and look over the placment of the lines, but that would change where the trans shifts at?
I thought converter stall, or kickdown | |
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04-21-2008, 07:19 PM
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#4 (permalink)
| | Moderator
Join Date: Sep 2007 Location: central illinois
Posts: 1,706
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Goes on the side of the transmission. Vacuum line runs up to the intake manifold.
__________________
93 Thunderbird 5.0 HO
89 Firebird L03
95 F150 XL
Get ready for the 351 boss build this summer, 4v closed chamber heads, 2.25/1.75 valves, .750 lift, 12.5:1 piistons, wieand tunnel ram, nitrous, I think its gonna roar!
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