• Ciao Guest - You’ve landed at the ultimate Guzzi site. NEW FORUM REGISTRATIONS REQUIRE EMAIL ACTIVATION - CHECK YOUR SPAM FOLDER - Use the CONTACT above if you need help. New to the forum? For all new members, we require ONE post in the Introductions section at the bottom, in order to post in most of the other sections. ALWAYS TRY A SEARCH BEFORE STARTING A NEW TOPIC - Most questions you may have, have likely been already answered. DON'T BE A DRIVE-BY POSTER: As a common courtesy, check back in and reply within 24 hours, or your post will be deleted. Note there's decades of heavily experienced Guzzi professionals on this site, all whom happily give endless amounts of their VALUABLE time for free; BE COURTEOUS AND RESPECTFUL!
  • There is ZERO tolerance on personal attacks and ANY HYPERLINKS to PRODUCT(S) or other competing website(s), including personal pages, social media or other Forums. This ALSO INCLUDES ECU DIAGnostic software, questions and mapping. We work very hard to offer commercially supported products and to keep info relevant here. First offense is a note, second is a warning, third time will get you banned from the site. We don't have the time to chase repeat (and ignorant) offenders. This is NOT a social media platform; It's an ad-free, privately funded website, in small help with user donations. Be sure to see the GTM STORE link above; ALL product purchases help support the site, or you can upgrade your Forum profile or DONATE via the link above.
  • Be sure to see the GTM STORE link also above for our 700+ product inventory, including OEM parts and many of our 100% Made-in-SoCal-USA GTM products and engine kits. In SoCal? Click the SERVICE tab above for the best in service, tires, tuning and installation of our products or custom work, and don't miss our GT MotoCycles® (not) art on the BUILDS tab above. WE'RE HERE ONLINE ONLY - NO PHONE CALLS MADE OR RECEIVED - DO NOT EMAIL AND ASK QUESTIONS OR ASK TO CALL YOU.
  • Like the new V100, GuzziTech is full throttle into the future! We're now running on an all-new server and we've updated our Forum software. The visual differences are obvious, but hopefully you'll notice the super-fast speed. If you notice any glitches or have any issues, please post on the Site Support section at the bottom. If you haven't yet, please upgrade your account which is covered in the Site Support section or via the DONATE tab above, which gives you full site access including the DOWNLOADS section. We really appreciate every $ and your support to keep this site ad-free. Create an account, sign in, upgrade your account, and enjoy. See you on the road in 2024.

850-T gearbox interchangeability???

cragar

cragar

Just got it firing!
Joined
Jul 28, 2010
Messages
9
I found a crack in the gearbox housing of my new (old) 850-T causing an oil leak. I found another gearbox from a 84 California II, it should just bolt up right????
The bike is already apart, just need a suitable replacement. Thanks for any advise.
 
cragar said:
I found a crack in the gearbox housing of my new (old) 850-T causing an oil leak. I found another gearbox from a 84 California II, it should just bolt up right????
The bike is already apart, just need a suitable replacement. Thanks for any advise.
Click to expand...

Yes. But I don't remember where the transmission vent is on the 84. I believe the 84 still has the good double row metal cage bearings so that is a good thing.

The only real differences in the 5 speed gearbox is the location of the speedometer drive in the back cover. To the side in loop frames, to the top in Tonti and Spine. The transmission vent has some variation also. Early bikes (like yours) through the detente plug for the shift drum, late through a vent at the back cover.
 
Good news, thanks. I'm going to try to secure that one and fit it. wish me luck. Thanks for your time.
 
Ummmm? Any chance of a pic of this crack? Gearbox castings on the five speeds are very robust and rarely crack. Also if the only problem is the case I'm sure that Mark and Sean at Guzzi Classics in Long Beach will be able to sort you out with a case, and build your internals into it, with small cost and it'll be shimmed up properly at the same time.

If you're determined to swap out the whole box sell me your old 'Cracked' one for $50 and I'll get Todd or John to hold it for me until I can get my Eldo crated up for shipment back here and I'll build a good'n out of it.

Pete
 
Pete, I'll give you $100 for it once you've made a good'n out of it :) Really I'm being lazy and haven't got round to shimming either of my boxes yet. Have to be the first gearbox I've heard of cracking too, maybe it took a hell of a hit somehow.
 
It's cracked at the inside end of the final drive shaft looks like it took a hit at the outside end. I'm sure Guzzi Classics would charge me quite a bit more than the $250 that I'm spending on the replacement to rebuild it but I am a welder and thought that I would repair it myself at some point and have it standing by just in case. If I get desperate for $50 I'll drop you a line. thanks.
 
pete roper said:
Ummmm Also if the only problem is the case I'm sure that Mark and Sean at Guzzi Classics in Long Beach will be able to sort you out with a case, and build your internals into it, with small cost and it'll be shimmed up properly at the same time.

Pete
Click to expand...


Having had my own T3 gearbox rebuilt & PROPERLY shimmed by the above Sean at MGC I can assure you that after the initial stiff gearbox break in period of a few thou miles doing so will result in a gearbox shifting much better than it ever has. Among other things all the usual false neutrals will be gone. Unless you really know what you are doing you will not get the same result. Your money, your choice.
 
You must log in or register to reply here.
Back
Top