429 motor and c6 trans

[Newold]

I have a 429 with a c6 trans attached. Out of a 71 thunderbird. Is the transmission the same length? And will it bolt right up to the cross member?

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[Don C]

The information at this link indicates that all cars, except Lincolns, had the same length tailshaft housing:

http://www.fordification.com/tech/transID-auto.htm

 

[Wilco549]

I'm about 99% sure the MM and frame perches are different..  The T-bird uses the wider mounts that were in LTD and other large corp cars. I'm putting a 70 LTD motor in mine and have ran into this issue myself. Basically, the LTD type mount is wider f-r by about 1" and are offset too much to put the engine, tranny in the right location. Picture below may help you identify them.



 https://www.rockauto.com/en/moreinfo.php?pk=315289&cc=1139802&jsn=12 is the LTD, T-Bird mount

https://www.ebay.com/p/1971-1972-1973-Ford-Mustang-429-CJ-460-6-Peice-Motor-Mount-Kit-Full-Set-Mounts/15021035339?iid=392074353185&_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D20131003132420%26meid%3D8ecb0773c1964eb488e893d477b000fd%26pid%3D100005%26rk%3D1%26rkt%3D5%26sd%3D162796297710%26itm%3D392074353185&_trksid=p2047675.c100005.m1851 appears to be the correct MM for the Mustang.

 

[Hemikiller]

My 72 T-bird with a 429 had the long tailshaft.

Another issue will be the column shift bellcrank on the trans doesn't play well with a floor shift.