1972 r75/5 rear drive

[tinkerer]

I have a /5 with a 32/10 rear drive with a well worn spline
I have access to a 37/11 rear drive with very low miles
What would be the down side of using the 37/11
I am assuming the speedo would be off somewhat and the rpms would increase
Any pros
Thanks

 

[20774]

Reduced gas mileage. Possible reduced top end speed. Quicker acceleration off the line.

 

[72r60/7]

Get the 37/11. If it is in good shape.
Use until you get the 32\10 refurbished. You can ride right thru repairs.
Rear Ends are hard to buy if non are for sale at a time when you need one.

You shouldn’t be that dissatisfied with the difference between a 3.2 (32/10) and the 3.36 (37/11).
Lower First gear (all gears) and lower 5500rpm highway speed (among other differences already mentioned). Lower speeding tickets too.

Charlie

 

[tinkerer]

Thanks all for the help
Any suggestions for the spline work
West coastish

 

[20774]

Hansen's BMW in Oregon is the place most often brought up for repair work. Additional discussion about spline work locations was in this past thread:

https://forums.bmwmoa.org/showthread.php?96290-Recommeded-shops-to-do-R90-6-spline-repair

 

[1074]

You never know exactly what you get when you buy a used item. Since you know what you have now, I'd send your unit out for a re-spline and reseal. Then it'll be like starting from scratch. Hansen's is known for their good work and you'll get yours back as good as new!