Morris Minor Owners Club

Hi

I bid and won a 3.7 differential

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... SA:GB:1123

Jamie

Well done exactly the one I have.....the Riley one...now you will need the Mini 1248 tpm speedo!
Interestingly my standard Morris speedo when checked against a handheld GPS was reading 60mph when I was doing 63 with this diff fitted, not as far out as I thought, would be interested to see if you have the same degree of error

with the 1248 tpm will it be over reading again to keep me on the good side of the law.

is there any difference in fuel economy etc.

Jamie

It does NOT over read - it's spot on! That diff may seem expensive - but it will always hold that value. He also has the huge front brakes ............ and the very rare big rear brakes too - but what a price!

not wanting to sound "off" but you can pick up the phone and get one from the wolsely 1500 spares place for half the price, and they are not really that rare. but still, you will need a mini 1248tpm speedo to get roughly the right speed

Not seen 3.7 diffs for 'half the price'! Sure that's not the less rare 3.9 diff you are thinking of? But do please tell where the 'Wolseley1500 Spares Place' is - and I will give them a try!
I do see one site - where several people have 'wanted' ads up for 3.7 diffs!

Is there a difference between the Midget and Riley 3.7 diff?

the wolseley 1500 was fitted with a 3.71:1 diff as was the riley 1.5.

i dont think their is a difference between the midget and riley diff. from what i recall the midget had an A series engine, but the riley had a nice meaty B series engine. apart from that, i can imagine they are the same

Midget diffs in the 3.7 and 3.9 range used BTA part numbers to show the use of the more sturdy diff 'carrier', if my notes from the 1980s prove correct. I have an ATA 3.7 diff and I pulled it from a Riley 1.5 about 10 years ago. I've never noticed the difference in carrier construction. Anyone?

Yes I have noticed what may be a difference not sure as I have never seen a midget 3.7 diff and mine is a riley one.
The Riley one has a different number of teeth, 11/41 which actually makes it a 3.727 diff though the difference is academic. But my Riley diff has sturdy pins that actually go through the diff housing which the Morris 4,22 diff does not have - does the midget 3.7 diff have this feature?

James my 1248 speedo is so spot on I cannot detect any error. And yes before I was getting 38mpg now getting between 42.5 and 44mpg, I keep a log of it over each fill.

3.7 diffs for £50? I'll have a couple as spares!

Only diff I've seen exploded was a Riley 1.5 one - in the wife's mildly tweaked 1960 1098 Minor - they ain't too strong.

Pete

I can only find 'wanted' adverts for 3.7 diffs! Certainly non for £50!! They are all similar construction - and yes - the BTA diff is supposedly stronger. I think provided it has good lubrication and is not treated too badly (ie spinning inside wheel on corners!) it will last well enough. I thought the Wolseley 1500 had the 3.9 diff - but it is just a thought and not based on any serious knowledge!
Good to hear you have improved fuel economy 'cor' - is that a standard 1098 engine - I can't remember your spec?

Yes bmc it is standard now - just a K and N alike air filter so far but a 12g940 head and oselli inlet etc large bore exhaust to go on eventually

I would have thought a 3.7 diff would have an easier time in the morris anyway and less risk of breaking a halfshaft too.

I am just having a bit of an experiment at the moment to see how much mpg I can get

Well done - keep these records coming. Was it you was going to try 'super' fuel to see if it made any difference ?

It was me and it didn't make the slightest difference!

Except to your pocket .

Better report BP to the advertising standards people! I'm sure of course they say 'up to' - or similar weasel words!

Didn't really expect any difference, esp on a relatively low comp moggie engine....? But nice to know that it's not worth spending on