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Old 02-26-2008, 01:56 AM   #1
iceassassin21
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Default Tools needed for a Ring and Pinion Swap (R160)

Planning on doing a 6spd swap soon. Trying to keep price down. Don't have a trans yet so I don't even know if I even need to swap it out yet. Just curious as to when I do my swap, time will be an issue and I want to be prepared. What size nut holding on the pinion and what bolts down the Ring (special bolts?) to the carrier.
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Old 02-26-2008, 02:02 AM   #2
iceassassin21
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Also curious if all year/make/model R160's can swap out the R&P with each other.
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Old 06-11-2008, 06:06 PM   #3
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bump, curious as well
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Old 06-11-2008, 09:47 PM   #4
ciper
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Its infinitely easer if you DONT swap the R&P but rather just switch carriers. For example you have a 4.11 open diff and a 3.9 - take the carrier/ring gear out of each and swap the carrier then put the new carrier/ring combo back into its original case.

If you do it this way you dont even have to mess with backlash adjustment and the pinion but crush washer doesnt need replaced!
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Old 06-11-2008, 11:02 PM   #5
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Um anytime you remove the pinion and put it in another housing you have to setup both bearing pre-load and backlash. Its just a matter of adjusting and if need be purchasing different thickness shims for proper adjustment. As far as the pinion flange nut. I cannot remember off the top of my head what size it is. I'd have to go out and check. For all the work that is involved and to still have a R160 I would just install a R180, as I don't seem to get along well with R160 spider gears
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Old 06-12-2008, 06:56 AM   #6
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Select years of EJ22 powered Impreza's (or any OBS) should have the 3.90 final drive that you need, and would be a straight bolt-in affair. Adding an LSD to those rear ends is just a few hours at a bench with no interruptions. Swapping the pinion is an act of frustration unless you have the special tools to determine pinion depth, shim selection and bearing preload. It can be done, but If I had to do it again, I would search out a 3.90 rear end and go that route. The 4.11 bits can be sold off to recoup some of the cost (if not all).

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Old 06-12-2008, 07:16 PM   #7
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95-99 L legacys have 3.9s too.
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Old 06-13-2008, 04:37 PM   #8
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I did the 3.90 swap in my garage with hand tools. It took maybe 6 hours. Checking the pinion depth doesn't require anything special, just a straightedge and a good ruler. As for the mesh of the ring and pinion, I used grease to show the engagement and there was no need for new shims. I just swapped shims from one side to the other.
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Old 06-13-2008, 10:29 PM   #9
Ryanr1490
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I would suggest finding an open 3.90 diff as these are cheap and you wont have to mess with the pinion (replacing the pinion requires special tools and an experienced mechanic to do it right) If you want you can take the carrier out of your wrx diff and swap it into the 3.90 diff so you can have vlsd, just use the the outer plates and shims from the wrx diff and swap the ring gear over.
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Old 06-13-2008, 11:41 PM   #10
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Anybody done a DIY writeup?
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Old 06-15-2008, 04:28 PM   #11
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Here's a basic picture guide, to be used in conjunction with a more in depth guide. http://www.ultimatesubaru.org/forum/...ad.php?t=66430

A more in depth guide, with no pics....
http://www.ultimatesubaru.org/forum/...ad.php?t=49919

Using these guides and paying attention to the bits that are specific to your stuff, will help you do it yourself. Ideally, you should download the rear differential section of your FSM if you don't already have it. It has the backlash settings, torque specs, and other specific info you'll want.

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