Author Topic: 1973 400 Trans Am engine into a 1979 body/frame  (Read 1047 times)

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Offline KSI DarrkSparrow

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1973 400 Trans Am engine into a 1979 body/frame
« on: March 01, 2014, 07:14:10 PM »
Having trouble finding the correct subframe engine mounts the mounts i currently have are 5 1/2 on the engine and 4 1/2 on the subframe and every parts store I have been to they cannot order them because they are only OEM made? Any links that might have them available?

Offline hada76

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Re: 1973 400 Trans Am engine into a 1979 body/frame
« Reply #1 on: March 01, 2014, 08:46:01 PM »
what motor came in the '79?
'76 T/A 455 4sp   sold
'78 T/A Y88 auto  sold
'79 T/A WS6 4sp
'70 Z/28 4sp

jeff

Offline 72blackbird

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Re: 1973 400 Trans Am engine into a 1979 body/frame
« Reply #2 on: March 02, 2014, 03:40:50 PM »
A 73 481988 400 has mounting 5 bolt holes per side- with the correct brackets it should drop into a 79 TA that came with a 301 or 400. Without those brackets you're gonna have a hard time- does the subframe have the correct clamshell mounts for a Pontiac V-8?

Geno

Offline KSI DarrkSparrow

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Re: 1973 400 Trans Am engine into a 1979 body/frame
« Reply #3 on: March 03, 2014, 08:24:23 PM »
The 79 originally came with the 403 olds but the block was busted due to the previous owner running it hot with no oil or water. So we pulled it out scrapped it and bought a 400 Pontiac out of a 73 Firebird and bored and stroked it to a 461.

Offline hada76

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Re: 1973 400 Trans Am engine into a 1979 body/frame
« Reply #4 on: March 04, 2014, 01:32:46 AM »
the olds motor had different mounts, like geno said you will need the mounts from a poncho motor
'76 T/A 455 4sp   sold
'78 T/A Y88 auto  sold
'79 T/A WS6 4sp
'70 Z/28 4sp

jeff

Offline KSI DarrkSparrow

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Re: 1973 400 Trans Am engine into a 1979 body/frame
« Reply #5 on: March 04, 2014, 10:04:01 AM »
So I need to find 301 or 400 mounts?

Offline soldadito

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Re: 1973 400 Trans Am engine into a 1979 body/frame
« Reply #6 on: March 07, 2014, 03:54:17 PM »
From my understanding, doing the same thing myself. That you will need a set of 400 motor brakes from a 400 out of a Fire Bird set up. The 403 and 400 share the same motor mount (on cross member). From what I found the motor mounts (clam shells/on cross member) are bolted in the same spot. If you bolt your brackets to the engine and your motor mounts also, with the engine and transmission in the car you use the transmission cross member to help find the right placement of the motor mounts on the cross member.

If anyone has different info or if this sounds correct please feel free to help out.