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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHTransmission rebuild upgrade option questions
Leading reported evidence
Check condition of bearings
Suggestion or failed attempt
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Read evidence and context
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Suggestion
Of course check the condition of bearings to the extent possible.
Leading evidence: 'Check condition of bearings' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check condition of bearings' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
Did you check the prices on LSD, its installation cost, G50-996 syncros and sliders, and gear sets?
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Suggestion
I'd also inspect 5th and 6th gear synchros, replace as needed.
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Suggestion
When I rebuild these transmissions (G96 for the 911, G86.20 for the first generation Boxster six-speed), replacing the 3rd-to-6th thrust washer with CMS' improved part is mandatory.
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Suggestion · Original poster
Replacing all of the syncros is a lot but could I just do 2-4 or some subset?
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Suggestion
When I rebuild these transmissions (G96 for the 911, G86.20 for the first generation Boxster six-speed), replacing the 3rd-to-6th thrust washer with CMS' improved part is mandatory.
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My c4's transmission is currently taken apart for some rebuild warranty work and i'm considering some upgrades / preventative maintenance while its out.
3 things i'm considering:
wavetrac diff - does this require rwd conversion
upgraded syncros - do I have to / should I replace all of them? or are there just a few important ones?
4:1 rack and pinion
I'm not made of money but the 4:1 is really tempting. Replacing all of the syncros is a lot but could I just do 2-4 or some subset? Thoughts?
"[you] are not made of money" ...
could have fooled me. Did you check the prices on LSD, its installation cost, G50-996 syncros and sliders, and gear sets? You have got to be kidding me.
The lower gear synchros are certainly the ones that see the most wear and are normally replaced. You may also want / need to replace their engagement teeth (dog rings) and shift sleeves, depending on condition. I'd include 1st gear. I'd also inspect 5th and 6th gear synchros, replace as needed. Of course check the condition of bearings to the extent possible.
When I rebuild these transmissions (G96 for the 911, G86.20 for the first generation Boxster six-speed), replacing the 3rd-to-6th thrust washer with CMS' improved part is mandatory. The factory washer breaks, and when that happens things get really expensive quickly. You may also want to replace the shift arrester segment with CMS' improved version.
I am a little surprised that you are coming to this forum for advice, when it sounds like you already have someone working on your transmission. They really ought to be your best source of good advice. Good luck with the project!
Well the entire transmissions already apart and that's covered under their warranty, so I wouldn't be paying much in labor costs, and that does make it significantly cheaper than it otherwise would be.
The diff's spider gear, case bearings and I believe the pinion bearing are being replaced at no cost too
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