Ford Forums banner
1 - 2 of 2 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter · #1 ·
I have an open rear end on my 09 mercury grand marquis, can I put a complete rear end assembly from a police p71 if the gear ratio is same. Is everything a bolt in since the police use coil springs and the merc uses air springs. Also if ratio is different will other things be affected, like the computer, speedometer. Looking for a posi with the 3.27 ratio. Car sucks in the snow and ice without a posi.
 

·
Super Moderator
Joined
·
1,534 Posts
It’ll bolt right in but is a lot of labor. As for different ratios, it will throw off the speedometer and shift points so the ecu will need an update.


Sent from my iPhone using Tapatalk
 
1 - 2 of 2 Posts
Top