1984 z28 engine swap
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Joined: Dec 2024
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1984 z28 engine swap
I知 engine swapping my Camaro, it originally had a 305 in it. I知 buying a 383 blue print engine from summit racing, I知 wondering since the new engine makes more than double the hp (440)as the stock engine will I need to upgrade my transmission or rear end?
Joined: Nov 2008
Posts: 2,106
Likes: 181
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: 1984 z28 engine swap
Need? No. Are you going to use 350 hp of that 440 hp? You are? Then yes, yes you will. The axles and transmissions and chassis and brakes and well everything, are fairly weak in our cars. Modifying a thirdgen for more power equals a lifelong project usually. But that's part of the fun. Good luck!
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Joined: Aug 2021
Posts: 418
Likes: 66
From: Central Michigan
Engine: SBC Dart 400 Holley 750 Carb
Transmission: 700R4
Axle/Gears: 28 spline 323 gears
Re: 1984 z28 engine swap
It all depends on how hard you are on it as to when the trans & rear end will go out. Might be more convenient for you to rebuild the trans when you do the swap rather than wait until it goes out.
Joined: Apr 2000
Posts: 1,536
Likes: 322
From: South Windsor, CT
Car: '89 GTA
Engine: ZZ6TPI
Transmission: T56
Axle/Gears: Borg Warner 3.70:1
Re: 1984 z28 engine swap
The OEM transmission and rear end are not rated for that much power. They will live for a while if you are nice to them, but you should be planning for upgrades.
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