40 rear axles

Bigmac48

Bigmac48

Member
So I have the rear out of my 40 sedan pulled the axles to change them cause someone before me cut the ends I have 16 tooth spider gears and have found several pair right length but 18 tooth spiders ,will the change work and if they will what else is needed to make them work . Thanks ,
 
Bigmac48 said:
So I have the rear out of my 40 sedan pulled the axles to change them cause someone before me cut the ends I have 16 tooth spider gears and have found several pair right length but 18 tooth spiders ,will the change work and if they will what else is needed to make them work . Thanks ,
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All the spiders need to work together. Either find the correct ones or you need to change the differential unit to match the replacement axle gearing.

Give Fred @ Southside Obsolete a call. He has NOS axles and will make sure you get the right ones.
 
The two axles and spider gears need to match up. Nothing else.

The rear in my avatar is made up with a 1946 center section,
1946 Merc ring and pinion, 1936 bells, and I don't remember what axles and spider gears.
I put 1936 carrier bearings on the Merc gear carrier.
I set the preload and backlash with one set of gaskets
My point is that it's pretty amazing how many different parts can go together correctly.

Karl
 
I know if I change to the 18 tooth I will also need the other side of the spider or what it mates to they will be included if I buy the diff gear 18 tooth axles , anyone have 16 tooth 32.5 or so length axles for sale for my 40 ,thanks in advance for responses and info , Bigmac48
 
All axle shafts from '35 to '41 are 32.85" in length, and will work in any of those axle housings. Tooth count was 18 up till 1939, when tooth count changed to 16. Again, will work in any year from '35 till '41, but will need to be in matching pairs and with corresponding spider gear.
 
ford38v8 is correct the 35-38 axle is the same length as the 40 but the machined gear end of the axle that engages the spiders is different. Early axles have 18 teeth,39-41 16. The correct 4 spiders are 12 or 11 depending on the axle used. As long as you keep the right spiders with the correct axles you can exchange 35-38 and 39-41 axles in the banjos in sets.
 
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