Rafy13bt

Like I said believe me its 477 and is a straight swap no tricks but you need to have the widder axels which usually are the ones with rear disc brakes glsse model...

Pele

iTrader: (28)

Huh? You just put the whole Kia Sportage Diff in or did you rebuild your diff with the Kia ring and pinion?

The axles shouldn't matter so long as you use the same differential.

Rafy13bt

I used the kia diff but the rear end, I didnt touch it isfrom the RX7 its a pull off put on deal. It has 43 teeth on the round ring and 9 on the pinion you divide 43by9 it give you 4.77 done deal...you will be seated in a rocket of course on highway use the rpm will be higher lets say at 60mph before it cruises at 3000 rpm 5th gear now will go maybe 4000 rpm 5th gear..

Rx7carl

Cool. Pele look at the pumpkin, its not a Mazda one. It has an extra lug on the side. It looks like its on its side, weird. ANyway let us know how she runs after you get it going.

Rafy13bt

I told you allready I try it with the 12A eng it was a rocket now you dont see the driveshaft attached because I am swaping the eng for a 13BT and the trannsmition is not on the car look at my other post titled my RX7 pics..

brandon davis

iTrader: (3)

Way to keep it real!

Rotor13B

Do You have a picture of it before you installed the diff?

Tranquil

iTrader: (1)

That's the setup Peejay is using right now. A Kia dif and pumpkin.

Direct bolt in, but don't quote me on it.

Siraniko

iTrader: (13)

I better go back in the junkyard so I can grab the rear. As I mentioned on my other posts, I got the front and its a 4.44 and not a direct swap.

aussiesmg

iTrader: (1)

Is this an LSD or not.

Alex-7

Not.

Siraniko

iTrader: (13)

I just came from the junkyard and found 2 KIA Sportage 4x4. One is a 94 and the other is 96. You stated that the your pix is the rear diffyand its a straight bolt-on to an 84-85 (both SE and non-SE). Please confirm.

Rafy13bt

Guys it is a Kia pumkin 4.77 and Mazda diff the one that comes with the car I am telling you guys straight swap. If you have the big axels the thicker ones. As far as I know the diff from a glsse model is the one with thicker axels.. trust me I did not change the rear end only the pumkin.. One more hint that I can think if it will fit in your car if your bolt pattern for the rims is 4-114 it will fit if your bolt patter is 4-110 will not fit. if you have this rims I am pretty sure it will fit.

Rotor13B

95-97 Sportage and 84-03 B2000- B2200 have 26 spline 27mm small axles. 98-05 Sportages have 28 spline 29mm axles. Check your axle and pick accordingly. I seem to remember that the 84-85 axles were 26 spline but that's not a definite.

Rafy13bt

Guys I belong to others RX7 forums but on this one I am new, I just post this topic to share a knoledge with you guys if you guys dont trust me or you think I went down on a kia to take the pics and not on my RX7 thats fine. Then I will keep it as a Puertorrican secret. Here is my car without the eng it is being replace with a 13BT it does not have the trannsmision on it...

Siraniko

iTrader: (13)

The reason why Im questioning is due to the fact that the KIA"s front and rear diffy has unidentical 3rd member housing. You said you used the rear diffy however, the KIA's rear diffy is identical to FB/SA diffy housing. Again, your so-called rear-diffy is the same as the one I picked up which is the front diffy. I just want clarification since I read many threads on what will work-I have proven them wrong.

Siraniko

iTrader: (13)

I used an actual RX-7 axles for test fitting.

Rafy13bt

Bro as far as I know the KIA front and rear pumkins are the same 4.77 maybe the 3rd member is on the other side I dont know but I know that the one I am using comes from a kia sportage from the 90s and is from the front end and a friend of mine is using the one from the rear end so what I can tell you is that both of the will work but maybe the 3dr member hole will be on the other side..call me 787-448-6000 its easier.

Siraniko

iTrader: (13)

its cool. I will be heading to the junkyard this week to get the R&P's... Still cheaper than buying them RB & Mazdatrix. In addition, during today's visit, I found several GSL (2 81, 82 & 85) . Got to stock up on parts.

Pele

iTrader: (28)

Front and rear diffs WILL be the same gear ratio, guaranteed. Otherwise you've got your front wheels doing 50 MPH and your rears doing 60... No good.

HOWEVER... Size may be different.

My Mazda B2600 4x4 has a 7 inch ring and pinion up front and a much larger one out back... Both are 4.44:1 ratios...

Reason being that the rears take more abuse and are used more frequently.

So let's make a list of vehicles that run the same Mazda 7 inch ring and pinion... If the pumpkin doesn't bolt up, the ring and pinion will be interchangable.

1989-2005 Miata has several ratios available... 3.909, 4.10, and 4.3...

1986-1993 B2600 4x4 (Front diff ONLY)... 4.44 (The B2600 is the only model available in 4x4. There were 10,000 made in it's span. Being that it's a truck it might have mud up in the diff. Being that it's a 4x4 and many people forget there's a whole seperate drivetrain to maintain, it may not be in that great a shape to begin with. Probably not worth actively seeking, but it is still an alternative.) Perhaps they carried the design over to Ford Rangers.

Kia sportage (Rear diff ONLY) 4.77 (years?)

I've heard that the Honda S2000 uses the same ring and pinion. Confirmation? What about the differential?

Any others?


As far as differential units, many will bolt up to the 7 inch ring gear... There's several Viscuous and Clutch based from the N/A FC as well as the GSL/GSL-SE...

Rafy13bt

I dont know of the B2000 or the honda I am telling you what I am using a Kia pumking direct swap on my car maybe yours is different.

aussiesmg

iTrader: (1)

English as a second language? Nobody's having a go at you Rafy, these are just other options.

Rafy13bt

Cool English is my second lag but I am doing my best I wont lie to you guys just sharing some info...

fbdrifterrx7

I have heard of alot of ppl doing this swap over here in orlando and seen it being done with my very own eyes. There is a all stock gsl-se that ran a 15.9 on a stock mazda pumkin and diff then during the week they did the kia swap and when they took it back to the track it ran a 14.3 .Anymore proof?. Look at that almost a 2second improvement by just doing a simple swap and cheap.

steve84GS TII

4.77 is awful low gearing.

I can see it being good for a mild or underpowered car, or for a racecar that needs more lowend but will not run out of revs on the straights.

For a street driven car with good power(especially a 13BT) your just gonna be spinning your tires and shifting all the time.1st gear goes by in a flash with my 4.07 rearend ratio,Ive contemplated going to 3.90 to get more action from 1st gear.I cant imagine what it'd be like with 4.77's...unless you plan on running some 18-19" wheels!

With lots of power you dont neccesarily need low gearing,you have plenty of power to spin taller gears.And most especially with a turbo,you need a big of gearing back there,to get more speed/time out of each gear and to give the turbo an opportunity to spool up.......just something to think about for anyone considering the 4.77's.