Sacko7 4 Posted January 30, 2024 Hi all, I have an 1982 Xe which I have converted to a 351, it runs at 2700rpm at 100kmh. I am looking at changing the diff ratio as I have put in an XR6 rear end to get disc brakes. I believe the ratio is 3.45. I have also been told to convert my gearbox from a three speed to a 4 speed for better top end revs. Can anyone advise me if this is possiobly and which box would i need and what modifications? Cheers Sacko7 Share this post Link to post Share on other sites
CHESTNUTXE 7,642 Posted January 30, 2024 just change your diff ratio. Share this post Link to post Share on other sites
bear351c 10,412 Posted January 30, 2024 All depends on what you want the car for..... 3.45 is a good all round ratio for economy and sprint off the line, most Clevo Automatics are 3 speed, (FMX, C4 etc) in XA, XD and similar vehicles. If you plan on going on 1200 kms trips, then you need more of a lower ratio, say 3.00 or even 2.92. The Clevo will be happy at 110km/h with a 3.45, but the revs will be slightly higher, so more fuel used and possibly a lot more noise in the cabin. I'm running 3.55 in my XB, with an FMX, and absolutely love it. But I wouldn;t drive from Perth to Sydney in it. Share this post Link to post Share on other sites
Sacko7 4 Posted February 2, 2024 Thanks guys, 2.92 now installed i will see how it goes cheers 1 1 deankxf and gregaust reacted to this Share this post Link to post Share on other sites
