#1  
Old 06-23-2022, 06:16 AM
Robert_Z_ Robert_Z_ is offline
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Default Swapping a 403 for a 455

I own a 79 Trans Am that originally had a 403. I purchased the 455 and th400 transmission for a 74 Trans Am. I'm wanting to know what all I would need to change out in order to drop the new engine and transmission in?

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Old 06-23-2022, 07:31 AM
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thepontiacman thepontiacman is offline
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sent you a list by PM

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Old 06-23-2022, 08:39 AM
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Why not put the list up for everyone?

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Old 06-23-2022, 09:16 AM
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thepontiacman thepontiacman is offline
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Motor mounts frame side and block mount brackets (f-body Pontiac)
Fuel line has to go to driver side
Shaker and air cleaner base(PONTIAC 400)
A/c lines
Fan shroud -pontiac
Engine harness - Pontiac,
Battery cables
Brackets and pulleys for Pontiac

This is a good start to get you headed in the right direction.

If you need the block motor mount brackets, I have them.

thepontiacman@yahoo.com


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Old 06-23-2022, 01:59 PM
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Quote:
Originally Posted by thepontiacman View Post
Motor mounts frame side and block mount brackets (f-body Pontiac)
Fuel line has to go to driver side
Shaker and air cleaner base(PONTIAC 400)
A/c lines
Fan shroud -pontiac
Engine harness - Pontiac,
Battery cables
Brackets and pulleys for Pontiac

This is a good start to get you headed in the right direction.

If you need the block motor mount brackets, I have them.

thepontiacman@yahoo.com


Sent from my Moto Z3 Play using Tapatalk
Thanks PontiacMan

  #6  
Old 06-23-2022, 03:55 PM
rockys1970 rockys1970 is offline
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Not sure if the '74 Turbo 400 trans will fit. My 1978 T/A w/ Pontiac 400 engine has a Turbo 350 Trans which is shorther in length, has a different trans mount location and uses a different spline on the front U-Joint than a Turbo 400.

Maybe the experts can comment here.

  #7  
Old 06-23-2022, 05:09 PM
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thepontiacman thepontiacman is offline
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TH400 will fit in the TA.

shorter driveshaft, TH400 yoke, and crossmember, electric kickdown switch/accelerator pedal assembly.

TH400 is longer than TH350. Yoke is bigger.

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  #8  
Old 06-23-2022, 06:49 PM
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It would prob be faster just putting. A 79 nose on a 74 ta.

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