Final Drive Discussion

[Dustin]

Just ordered my 4.56 final drive from Weir Performance. Should be here by the end of the week!!!

[37]

Here's the list I compiled with help from @Jeff Lange describing what all I'd need. Part numbers are on me so if anyone finds an error, please let me know so I can correct the list.

90179-20018 ... Pinion nut
90311-38070 ... Pinion seal
41231-24010 ... Pinion spacer
90366-35133 ... Pinion bearing*
90311-43009 ... Side seals (x 2)
41222-22010 ... Ring gear lock tabs (x 5)
12157-10010 ... Drain bolt gasket
SU003-00122 ... Fill bolt gasket
(listed above) ... Pinion bearing shims
(listed below) ... Diff washers**

*Note 1: Pinion bearing can potentially be reused if you or your shop has the removal tool and your bearing is still in serviceable condition. Replacement is recommended but not mandatory depending on these conditions.

**Note 2: Side washers might be needed depending on the new ring/pinion tolerances. If anyone has any input on this, please add to the discussion.


Diff washers in order of thickness:
90201-52001 ... T=2.58, MARK 01
90564-46014 ... T=2.60, MARK 32
90564-46015 ... T=2.62, MARK 33
90201-52003 ... T=2.64, MARK 03
90564-46016 ... T=2.66, MARK 34
90564-46017 ... T=2.68, MARK 35
90201-52005 ... T=2.70, MARK 05
90564-46018 ... T=2.72, MARK 36
90564-46019 ... T=2.74, MARK 37
90201-52007 ... T=2.76, MARK 07
90564-46020 ... T=2.78, MARK 38
90564-46021 ... T=2.80, MARK 39
90201-52009 ... T=2.82, MARK 09
90564-46022 ... T=2.84, MARK 40
90564-46023 ... T=2.86, MARK 41
90201-52011 ... T=2.88, MARK 11
90564-46024 ... T=2.90, MARK 42
90564-46025 ... T=2.92, MARK 43
90201-52013 ... T=2.94, MARK 13
90564-46026 ... T=2.96, MARK 44
90564-46027 ... T=2.98, MARK 45
90201-52015 ... T=3.00, MARK 15
90564-46028 ... T=3.02, MARK 46
90564-46029 ... T=3.04, MARK 47
90201-52017 ... T=3.06, MARK 17
90564-46030 ... T=3.08, MARK 48
90564-46031 ... T=3.10, MARK 49
90201-52019 ... T=3.12, MARK 19
90564-46032 ... T=3.14, MARK 50
90564-46033 ... T=3.16, MARK 51
90201-52021 ... T=3.18, MARK 21
90564-46034 ... T=3.20, MARK 52
90564-46035 ... T=3.22, MARK 53
90201-52023 ... T=3.24, MARK 23
90564-46036 ... T=3.26, MARK 54
90564-46037 ... T=3.28, MARK 55
90201-52025 ... T=3.30, MARK 25
90564-46038 ... T=3.32, MARK 56
90564-46039 ... T=3.34, MARK 57
90201-52027 ... T=3.36, MARK 27
90564-46040 ... T=3.38, MARK 58
90564-46041 ... T=3.40, MARK 59
90201-52029 ... T=3.42, MARK 29
90564-46042 ... T=3.44, MARK 60
90564-46043 ... T=3.46, MARK 61
90201-52031 ... T=3.48, MARK 31

[Anthony]

Originally Posted by 37

Here's the list...

Very nice!

Originally Posted by Dustin

More good info!!

I wish I was awesome enough to quote people from the future.

[Dustin]

Originally Posted by Anthony

I wish I was awesome enough to quote people from the future.

It's a gift. Lol, yeah I just copied and pasted from where he posted in another thread. Sorry bout that. Thanks for the great info @37!!

[8686]

Originally Posted by 07jazzrs5gt86

What new seals part number you need for the install?
How many shims did it come with?
I've read on 1 of the cusco tread that each car have different shims size.

The mechanic told me he used the old seals.
I didn't count how many seals it came with. It was in a small clear bag that I was afraid to open. The install is done but I am on business trip and will not be able to get the car until Thursday when I am back home.

[8686]

Originally Posted by 448hpsti

pics? before and after dyno? thx!

I don't believe this mod will add anything in term of HP. It will just help the car accelerate faster.

[8686]

Originally Posted by JimmyMac

Looking forward to your install! Keep us posting on anything you come across.

The install is done buy our local mechanic but I will not be able to drive the car until Wednesday. cant describe my feelings.

By the way my car is AT

[8686]

Just drove my car around the block. Difinitly accelerate better. Mostly in 1-3 the gears are shorter than before. My guess, is gears became like MT from 1-3. Need to drive it on the high way to test 4-6 gears. I am very satisfied with this change.


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[Dustin]

Just got my Weir Performance 4.56 final drive and solid pinion spacer. He supplied shims for both. I'm going to buy a few more things before installing it but we've purchased from Weir before and his products are top notch!! We have his axles, final drive, and solid pinion spacer in my brother's AE86. Anyone wanting to do this mod should definitely get in touch with him. Everything for well under $400 shipped and I received it in 2 days!!!

[Anthony]

Very nice.

[448hpsti]

Damn. Nice.

[37]

Originally Posted by Dustin

Just got my Weir Performance 4.56 final drive and solid pinion spacer. He supplied shims for both.

Nice! Let us know how your install goes without the pinion bearing. For that price I'd have bought one without question, especially since he offers Koyo.

[Dustin]

Originally Posted by 37

Nice! Let us know how your install goes without the pinion bearing. For that price I'd have bought one without question, especially since he offers Koyo.

That's one of those things I still have to buy. I'm gonna get the pinion bearing, pinion seal, and a few other things.

[448hpsti]

if youre careful and low miles shouldnt be an issue if youre delicate with the press!