EVO I-III RATIOS:
Info I've gathered and discovered over time and summarised below.
TRANSFER CASES:
* VR4 gearbox + VR4 transfer case input spline count = 22 (You will need a 1.090 VR4 transfer case when using a VR4 gearbox as its the only transfer case to suit the gearbox output shaft's spline count) = 3.545 rear diff ratio result. NOTE: VR4 EVO have a 23 spline count therefore refer to below GSR stats.
* GSR gearbox + GSR transfer case input spline count = 23 (You can mix and match a GSR gearbox with a GSR or EVO I-II 1.090 transfer case only) = 3.545 rear diff ratio result
* EVO I-II gearbox + EVO I-II transfer case input spline count= 23 (You can mix and match EVO I-II gearbox with GSR or EVO I-II 1.090 transfer cases only) = 3.909 rear diff ratio result
* EVO III gearbox + EVO III transfer case input spline count = 23 (You MUST USE the EVO III 1.074 transfer case with the EVO III gearbox only as it corrects the ratio to accept a 3.909 rear diff) = 3.909 rear diff ratio result
REAR DIFFS:
* First thing's first. All EVO I-III rear diff ratios are 3.909. All EVO I-III RS/GSR had a rear mechancial LSD diff centre, except the EVO 1 GSR which had a viscious LSD rear centre with different length rear driveshaft cups and shafts.
* If you are using an EVO III gearbox, YOU MUST also use an EVO III transfer case to correct the rear ratio to 3.909 - this will suit any of the EVO I-III 3.909 rear diffs.
* To make an EVO rear mech LSD a ratio of 3.545 to suit a E39A Galant VR4 or GSR 3.545 gearbox - Simply keep your existing GSR or VR4 rear diff housing, remove the diff centre and remove the 3.545 crown wheel and pinion from it. Get an EVO rear mech LSD centre, and transfer your 3.545 crown wheel and pinion into it. The replaced parts will NEED to be done by a professional as they need to setup the backlash and tooth contact correctly. If its a tiny bit off you're screwed. This can then go back into your existing housing and your existing axles can plug straight in.
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The gear ratios are on lancerregister.com under 'evo 1-3 buyers guide'
Here they are anyway:
EVO I:
2.571 (1st)
1.600
1.160
0.862
0.617 (5th)
Rear diff: 3.909
EVO II-III: (EVO III has slightly different transfer and front diff ratio)
2.750 (1st)
1.684
1.160
0.862
0.617 (5th)
Rear diff: 3.909
GSR: (CD5A)
2.917 (1st)
1.684
1.115
0.833
0.666 (5th)
Rear diff: 3.545
I have also got some info on EVO/GSR/VR4 diff and transfer case ratios below which I got from NZ MMC:
VR4s and GSRs:
1.090 Transfer ratio (TR) (24/22)
3.867 (58/15) front diff ratio. (FDR)
3.545 (39/11) Rear diff ratio (RDR)
RDR x TR = 3.866 combined rear final drive
Total final Drive ratio TFD of 4.9333
EVO 1 and 2s:
1.090 (24/22) TR
4.266 (64/15) FDR
3.909 (43/11) RDR
RDR x TR 1.090 (24/22) = 4.264 combined rear final drive
TFD = 5.443
EVO 3
1.074 TR (29/27)
4.200 (63/15) FRD
3.909 (43/11) RDR
RDR x TR = 4.199 combined rear final drive.
TFD = 5.358
The total final drive TFD, is the diff ratio (front or rear+transfer) multiplied by the 37/29 (1.276) primary reduction inside the gearbox that occurs before the diffs.
Contrary to belief, converting one of these 4WD 'boxes to FWD will NOT change the final drive ratio, why the hell would it?
"and yes an evo 2 gearbox and evo 3 rear diff would work together using either the evo 2 or gsr transfer case"
