305 to 350
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Joined: Nov 2006
Posts: 30
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Car: 84 Z28
Engine: LG4
Transmission: 700R4
Axle/Gears: 3.23
305 to 350
If I wanted to take my 305 out and replace it with a 350 from the 60s or 70s, would the transmission still shift the same? Is there anything else I would need to know that I'll have to change for this swap? The car is a 84 Z28 LG4
Joined: Sep 2004
Posts: 2,777
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From: Casselberry, FLA
Car: 88 V6 'bird/89TBI bird/85 T/A
Engine: 2.8/TBI/TPI
Transmission: V8 T-5/700R4 x2
Axle/Gears: 3.42 open/2.73 open/ 3.27 9 bolt
Re: 305 to 350
The transmission shifts are decided by how your TV cable is adjusted. If you re-use your intake and carb, the way it is set now shouldn't change.
If you are running a different setup then you will need to re-adjust your TV cable to make it shift properly. Your repair manual will tell you how to adjust the cable.
If you are running a different setup then you will need to re-adjust your TV cable to make it shift properly. Your repair manual will tell you how to adjust the cable.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
If you run the LG4 ignition/induction system (only sane approach for a street driven car, IMO), then all you have to do is properly adjust the TV cable when you reinstall. Adjusting the shift point/behavior with TV cable adjustments is an absolute no-no.
If you don't use the LG4 carb, then you have to make absolutely sure the cable, bracket, and lever geometry exactly matches the q-jet configuration, or you'll be buying transmission after transmission.
If you don't use the LG4 carb, then you have to make absolutely sure the cable, bracket, and lever geometry exactly matches the q-jet configuration, or you'll be buying transmission after transmission.
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