429 TJ Engine Swap question

regislovato · 11-10-2008, 01:17 AM

I had just gotten my hands on a 429 Thunder Jet and C6 tranny out of a 1971 T-bird recently, and I really want to drop it into my '73 Mustang. Does the motor mount up differently as apposed to a Cobra Jet from '71? Would I have any trouble mounting the C6 up where the old C4 used to be? What sort of mounting hardware would I need to get it all nestled in? You all can probably tell I'm new at this, and any help and guidance would be greatly appreciated!
Thanks!

bmxmon · 11-17-2008, 02:01 AM

I start out saying im pretty bad when it comes to ford big blocks. I did a little research and in 71' the mustangs cobra jet motor was the 429, so the same block as the one you have out of the t-bird. So as far as the motor is concerned I believe it should just be a simple replacement.
I really cant tell you much about the transmissions. If your mustang was originally a BB car I dont believe it should of had a c4 in it. I believe it should of came with an FMX transmission.

regislovato · 11-19-2008, 08:31 PM

I got it with a 302 and C4, and even then, I'm not totally sure if any of it's really the original equipment. is there a difference in dimensions between the C6 and C4?
Thanks

red · 11-20-2008, 07:27 PM

c6 is bigger

regislovato · 11-21-2008, 08:37 PM

What kind of modifications would I need to bolt up a C6 to my mustang? Sorry, I'm really inexperienced at this.

11-10-2008, 01:17 AM	#1
regislovato Registered Member Join Date: Nov 2008 Location: Bernalillo, New Mexico Posts: 5	429 TJ Engine Swap question I had just gotten my hands on a 429 Thunder Jet and C6 tranny out of a 1971 T-bird recently, and I really want to drop it into my '73 Mustang. Does the motor mount up differently as apposed to a Cobra Jet from '71? Would I have any trouble mounting the C6 up where the old C4 used to be? What sort of mounting hardware would I need to get it all nestled in? You all can probably tell I'm new at this, and any help and guidance would be greatly appreciated! Thanks!

11-17-2008, 02:01 AM	#2
bmxmon Registered Member Join Date: Mar 2004 Location: Minnesota Posts: 950	Re: 429 TJ Engine Swap question I start out saying im pretty bad when it comes to ford big blocks. I did a little research and in 71' the mustangs cobra jet motor was the 429, so the same block as the one you have out of the t-bird. So as far as the motor is concerned I believe it should just be a simple replacement. I really cant tell you much about the transmissions. If your mustang was originally a BB car I dont believe it should of had a c4 in it. I believe it should of came with an FMX transmission. __________________ Alex

11-19-2008, 08:31 PM	#3
regislovato Registered Member Join Date: Nov 2008 Location: Bernalillo, New Mexico Posts: 5	Re: 429 TJ Engine Swap question I got it with a 302 and C4, and even then, I'm not totally sure if any of it's really the original equipment. is there a difference in dimensions between the C6 and C4? Thanks

11-20-2008, 07:27 PM	#4
red Registered Member Join Date: Sep 1998 Location: Millburn, NJ Posts: 310	Re: 429 TJ Engine Swap question c6 is bigger

11-21-2008, 08:37 PM	#5
regislovato Registered Member Join Date: Nov 2008 Location: Bernalillo, New Mexico Posts: 5	Re: 429 TJ Engine Swap question What kind of modifications would I need to bolt up a C6 to my mustang? Sorry, I'm really inexperienced at this.

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