How can I tell if a diff is a 3.9 ratio.

Post by **Oddball67** » Fri Apr 22, 2011 8:22 pm

I've discoverd a diff that may be a 3.9 ratio? However I'm unsure and before a possible purchase I'd like to check. All I can se on the crown wheel is MOWOG BTA 1224 10-39.

I'm sure there's someone out there that can tell me what to look for or, possiby the number of teeth? Unable to get to the pinion as the diff is all assembled.

Any assistance would be appreciated.

Post by **taupe** » Fri Apr 22, 2011 8:29 pm

Hi

39/10 = 3.9

Taupe

Post by **Oddball67** » Fri Apr 22, 2011 8:37 pm

Cor Blimey Taupe, that was a quick response.!

Cheers matey.

Post by **Alex'n'Ane** » Fri Apr 22, 2011 9:03 pm

Are 3.7 marked in a similar way?

Post by **bmcecosse** » Fri Apr 22, 2011 11:03 pm

41/11 = 3.73

Post by **mike.perry** » Fri Apr 22, 2011 11:46 pm

9/41 = 4.55, 7/37 = 5.286, 8/43 = 5.375. Stamped on the axle case of Series MM diffs. Might as well have the others

Post by **chrisryder** » Sat Apr 23, 2011 10:25 am

and 9/38 = 4.22

Morris Minor Owners Club

How can I tell if a diff is a 3.9 ratio.

How can I tell if a diff is a 3.9 ratio.

Re: How can I tell if a diff is a 3.9 ratio.

Re: How can I tell if a diff is a 3.9 ratio.

Re: How can I tell if a diff is a 3.9 ratio.

Re: How can I tell if a diff is a 3.9 ratio.

Re: How can I tell if a diff is a 3.9 ratio.

Re: How can I tell if a diff is a 3.9 ratio.