I remember seeing a thread on how to put a Kia sportage diff into my 89 fc. I want the 4.77 gears ratio. Anybody ever done this swap or know where the link is? Any info is greatly appreciated. Thank you.

 

I thought that was more of a 1st gen thing.

 

There are guys that do it in their FCs. I don't know about the reliability so I'm looking for that information as well.

 

You need to have the pinion lengthened to fit an FC center section, so you'd need a donor set of FC gears as well

 

It is a direct swap into the large bearing or axle FB axles. I have the sportage gearset in my B2200, it was a direct swap, just had to change over the driveshaft flange. I am using a FC GXL LSD with these gears. The pinion is 1/2 the length for a FC.

 

I tried finding a shop to swap the pinion gear with no luck. I finally swapped the whole short nose diff using a custom driveshaft (longer) to work. Then had a fab shop build a custom front diff mount which ended up sloppy and clunking. After 6 months of trying to find someone to build a better mount, i fave up and put the stock diff back in.


Ps: d*#n i love the 4.77 for the short tims i got to use it

 

Speedsource used to make 4.88 and the same with ISC racing.

Welcome to Rebello Racing and Mazdatrix can do the fabrication for you.

Rebello costs about $350 + shipping them all the gears to do the modification. I may be doing a spare one here in the future. You'll need a Kia 4.77 r&p set and a long pinion for them to modify.

Good luck!

Welcome to Rebello Racing

His son does the modification.

 

or you could just swap to a ford 8.8" and have any gear ratio you want

FC Ford 8.8 IRS - Complete Mount Kit w/ Axles

 

Actually the better and cost effective solution in the end.

I love the gear ratio selection and it's easy to find a shop to setup a 8.8.

 

I thought I saw a thread in the "other ROTARY car forum"

 

Either way you're looking at a big investment to change the final drive of these cars.