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MGC rear axle ratios

Posted by Johnzo

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MGC rear axle ratios #1
Johnzo John Zoltner Rochester, NY, USA 1977 MG MGB V8 Conversion	Posted: March 10, 2012 07:46PM Registered: 1 year ago Posts: 59

Can anybody tell me what rear axle ratios were available in the MGC?
thanks!
John

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Re: MGC rear axle ratios #2
toomanytoys mike odernheimer park city, USA	Posted: March 10, 2012 11:52PM Registered: 1 year ago Posts: 9

'68 model used 3.07 non-overdrive/3.307 overdrive. '69 model changed to 3.307 non-overdrive and 3.7 overdrive. MGB was 3.9 all years and configurations.

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Re: MGC rear axle ratios #3
ron neal Coastal, South Carolina, USA 1962 MG MGA MkII 1968 MG MGC 1969 MG MGC 1969 MG MGC 1969 MG MGC GT → more	Posted: March 11, 2012 05:47AM Registered: 4 years ago Posts: 3,331

And the MGC auto used the 3.307.

Ron

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Re: MGC rear axle ratios #4
mowog1 Rick Ingram Saint Joseph, Illinois, USA	Posted: March 11, 2012 02:07PM Registered: 8 years ago Posts: 20,500

The 3.7 is fairly worthless in my opinion.

The 3.07 and the 3.31 are the most desirable of the three diffs, with the 3.31 being "top dog".

1968 MGC - 1969 MGC - 1972 MGB - 1974&1/2 MGB/GT V8 conversion - 1978 MGB

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Gearset markings.jpg (64.2 KB) –

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Re: MGC rear axle ratios #5
mgcgt2912 Richard Bailey Cully, East Devon England, United Kingdom 1969 MG MGC GT	Posted: March 11, 2012 02:30PM Registered: 2 years ago Posts: 703

In reply to # 2008526 by mowog1 The 3.7 is fairly worthless in my opinion.

Reason being ?..... Mine is 3.7 ( with overdrive). Its not worthless to me !

R

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Re: MGC rear axle ratios #6
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: March 11, 2012 04:54PM Registered: 4 years ago Posts: 13,179

I am in the market for several 3.70 FWIW

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Robert Kirk
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Re: MGC rear axle ratios #7
romeo69 stephen curtis berkshire, United Kingdom	Posted: March 11, 2012 05:09PM Registered: 2 years ago Posts: 400

auto mgb has 3.7 also fitted ..robert

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Re: MGC rear axle ratios #8
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: March 11, 2012 05:15PM Registered: 4 years ago Posts: 13,179

Don't care where it comes from as long as its a 3.7 for the tube axle or banjo for that matter...

Thanks Steveio...get my package yet?

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Robert Kirk
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Re: MGC rear axle ratios #9
ron neal Coastal, South Carolina, USA 1962 MG MGA MkII 1968 MG MGC 1969 MG MGC 1969 MG MGC 1969 MG MGC GT → more	Posted: March 11, 2012 05:53PM Registered: 4 years ago Posts: 3,331

I also like a 3.7 in a MGC with od. Makes a great car better. I will have to admit with a V8 and a 3.07 it is even a more relaxed cruiser but if I want to really cruise I break out the SV which gets 30 mph per 1000 rpm. Rpm limited to about 6500 since it is not a 3 or 4 valve engine.

Ron

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Re: MGC rear axle ratios #10
mowog1 Rick Ingram Saint Joseph, Illinois, USA	Posted: March 11, 2012 08:28PM Registered: 8 years ago Posts: 20,500

That's my point.

You need an o/d in order to make the 3.7 an appropriate gearset.

My 1968 MGC does NOT have o/d.

The MGBs with BW35's are as rare as hen's teeth in the North American market.

I've seen two examples since 1974.

1968 MGC - 1969 MGC - 1972 MGB - 1974&1/2 MGB/GT V8 conversion - 1978 MGB

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Re: MGC rear axle ratios #11
ron neal Coastal, South Carolina, USA 1962 MG MGA MkII 1968 MG MGC 1969 MG MGC 1969 MG MGC 1969 MG MGC GT → more	Posted: March 12, 2012 05:49AM Registered: 4 years ago Posts: 3,331

I have one hens teeth but it is a RHD GT.

You guys with multiple models hopefully I will see some of you in Dillard (now that I have a MGBGT). First tank of gas (premium) mostly city driving and mpg was 25. Second tank is mid grade and not empty yet but no problems so far. Begenning to like this car.

Ron

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Re: MGC rear axle ratios #12
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: March 12, 2012 09:14AM Registered: 4 years ago Posts: 13,179

Wouldn't that be, "I have one hen's tooth"....

Its OK Ron, I know a dentist who can get you a full set of mammalian teeth... devil smiley

Regards,
Robert Kirk
kirkbrit@yahoo.com
563 323 1017
Moss distributor UK importer
Beat or match any retail/delivered quote

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Re: MGC rear axle ratios #13
romeo69 stephen curtis berkshire, United Kingdom	Posted: March 12, 2012 01:58PM Registered: 2 years ago Posts: 400

i was aware that 3.7 did only come with overdrive!! my later mgcs without od have 3.307.. or have i misread ricks post

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Re: MGC rear axle ratios #14
mgcgt2912 Richard Bailey Cully, East Devon England, United Kingdom 1969 MG MGC GT	Posted: March 12, 2012 02:04PM Registered: 2 years ago Posts: 703

In reply to # 2009397 by romeo69 i was aware that 3.7 did only come with overdrive!! my later mgcs without od have 3.307.. or have i misread ricks post

Like wise confused. BMC didnt offer 3.7 without o/d as far as I know.
Hence my previous comments.
R

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Re: MGC rear axle ratios #15
ron neal Coastal, South Carolina, USA 1962 MG MGA MkII 1968 MG MGC 1969 MG MGC 1969 MG MGC 1969 MG MGC GT → more	Posted: March 12, 2012 02:10PM Registered: 4 years ago Posts: 3,331

Robert
When I think of one tooth I think of the front row of a Willie Nelson concert, so I just forgot about the singular/plural thing. If a chicken truly has no teeth then would it matter if you used the plural term for tooth?

As far as mammalian teeth some are herbivors, some carnivors and some omniverous. All require a different set of chompers.

Ron

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Re: MGC rear axle ratios #16
romeo69 stephen curtis berkshire, United Kingdom	Posted: March 12, 2012 02:42PM Registered: 2 years ago Posts: 400

the 3.7 diff also ran the best gear set in the box closer ratio between 2nd and 3rd not that i can tell the difference when driving

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Re: MGC rear axle ratios #17
kirks-auto robert kirk Davenport, Iowa, Rock Island, Illinois, Clearwater, USA	Posted: March 12, 2012 03:16PM Registered: 4 years ago Posts: 13,179

So it appears:
1968 no OD 3071 (14/43 stamped) P/N BTB900 also MG V8
1968 with OD and 1969 no OD and auto 3307 (13/43 stamped) P/N BTB841 aka BTB842
1969 with OD 370 (10/37 stamped) P/N BTB1244 also used in the most rare MGB auto

MGB tube axle w/wo OD 3909 (11/43 stamped) P/N BTB856

Is that the consensus gentlemen?

Edited as per SteveioRomereo.... smileys with beer

Re-edit per other xpertz thumbs up

Regards,
Robert Kirk
kirkbrit@yahoo.com
563 323 1017
Moss distributor UK importer
Beat or match any retail/delivered quote

Edited 2 time(s). Last edit at 03/13/2012 10:14AM by kirks-auto.

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Re: MGC rear axle ratios #18
romeo69 stephen curtis berkshire, United Kingdom	Posted: March 12, 2012 04:42PM Registered: 2 years ago Posts: 400

couple of digits have slipped robert on you keyboard 14/43was the first one and if you look on btb841 its always stamped as btb842!! wonders of mowog

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Re: MGC rear axle ratios #19
ron neal Coastal, South Carolina, USA 1962 MG MGA MkII 1968 MG MGC 1969 MG MGC 1969 MG MGC 1969 MG MGC GT → more	Posted: March 12, 2012 06:46PM Registered: 4 years ago Posts: 3,331

Dont forget a 68 with od used a 3.3

Ron

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Re: MGC rear axle ratios #20
Larry92021 Larry Hallanger San Diego area, CA, USA 1949 MG Y-Type Saloon 1958 MG MGA 1500 1969 MG MGC 1972 MG MGB GT	Posted: March 12, 2012 08:51PM Registered: 3 years ago Posts: 342

Rick

Can you give a wider view of the axle showing where the Differential Case Gearset Markings are located. I want to verify what my spare axle is and haven't been able to find the markings. Couldn't find them on my spare B axle either so am probably looking at the wrong spot.

Thanks

Larry
San Diego area, CA

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