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850 Transmissions

pizza for you

pizza for you

Cruisin' Guzzisti
GT Contributor
Joined
Jun 8, 2015
Messages
176
Location
Ohio
After finishing the assembly of my 850 T transmission I started thinking about the differences in the transmissions within the loop frames . Are the lay shafts the same between the 850T and the rear disc brakes such as the T3, G5 ? My transmission has the vent in the main housing while I noticed some vents are in the rear cover. Are the transmission ratios different from others say like engine sizes and years ?
 
I think the major gearbox difference is the shift drum. I'm hoping Amboman will chime in. The T uses a drum brake and doesn't have the boss on the swing arm to be able to use a disk brake. Also the rear wheel hub is different so you would need a T3/G5 type hub. Early geaboxes vented through the detent spring for the shift drum. Heavy oil could block this vent causing issues so use synthetic gear lube. The later gear box covers added the vent to the rear cover.
 
Guzzi made a lot of changes to the five speed between '72 and '75 - thicker flanges on the inner races of the bearings on gears 1-3 and a different output shaft to match, three bolt bearing retainers replacing the early two bolt, shift drum changed to make the shift pattern "normal", shift selector mechanism revised.

No difference in transmission shafts related to drum or disk rear brakes. Ratios stayed the same except maybe for the special straight-cut gear transmissions.
 
Good information to know. The reason I posted this is that I found a transmission out of a 1997 California not far from me. I did not know what transmission I could use for spare parts and what the differences there were. I thought about making an offer for it in case I need it in the future.
 
pizza for you said:
Good information to know. The reason I posted this is that I found a transmission out of a 1997 California not far from me. I did not know what transmission I could use for spare parts and what the differences there were. I thought about making an offer for it in case I need it in the future.
Click to expand...
It would be best to use the complete internals together, rather mixing and matching with the earlier parts. Definitely do not use the double row ball bearings with plastic cages from the '97 transmission.
 
Thank you for that information. When I reassembled the transmission I used the bearing with the plastic cage, could not get the steel caged bearing at that time. Looks like I will have to dissemble the transmission and look for a steel cage bearing . As Charlie Brown would say rats !
 
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After rereading your reply I see that I mistaken the bearings you were talking about for this one on the lay shaft. Below is my old bearing. The new bearing on the lay shaft bearing has a plastic cage. All other bearings have steel cages Plastic gage bearing
New bearing looks like this. This photo taken from article written by John Noble
Lay shaft bearring Foxit Reader
 
^^ Curious about the use of plastic retainers in transmissions . I remember they were a bad idea
for crank bearings ( Norton Commando ) they'd certainly get hotter in the motor . But do they suffer
the same in transmissions ? Peter
 
If you can find the equivalent bearing with a steel cage I recommend using the steel cage. I've seen failures of the plastic cages on the 3205 input and output bearing.
 
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