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Old 03-27-2015, 06:32 AM   #21
JM 35 Sedan
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Default Re: Rear end swap

X2 what JWL said
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Old 03-27-2015, 08:06 AM   #22
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Default Re: Rear end swap

Get a Mitchell OD
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Old 03-27-2015, 11:07 AM   #23
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Default Re: Rear end swap

I'm told the numbers 9 34 are stamped equaling a 3:78.......
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Old 03-27-2015, 11:16 AM   #24
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Default Re: Rear end swap

9 / 34 does equate to 3.78, BUT......that does not guarantee that the originals are STILL in there. Just FWIW !

You can pull the fill plug, mark one of the ring gear teeth, and rotate the ring ONCE while counting the teeth. DD
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Old 03-27-2015, 11:35 AM   #25
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Default Re: Rear end swap

How many teeth then?
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Old 03-27-2015, 11:48 AM   #26
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Default Re: Rear end swap

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Quote:
Originally Posted by dean333 View Post
How many teeth then?
If it counts 34 teeth, it IS in fact a 3.78.

If it counts 37, it is a 4.11.

If it counts 39, it is a 3.54.

DD
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Old 03-27-2015, 04:03 PM   #27
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Default Re: Rear end swap

Scooder is right about the carrier bearings, 37 up are all the same but the 35/6 are different from the later. Get the cups out of the later housings and put in your 36 housings.
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Old 03-27-2015, 04:35 PM   #28
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Default Re: Rear end swap

Jim,
Just to clear ambiguity, are you saying you can use a 37 up center banjo complete, in pre 37 axle casings, if you fit the bearing cups (the part that the goes in the differential end of the bell)?
I kinda thought you'd swap the pre 37 diff carrier bearings onto the 37 up diff carrier, to make it go together. Would either way achieve the same end product?
Asking purely for clarity for the OP and anyone else thinking of doing this.
I have a small pile of leftover V8 rear parts tucked away, and have a feeling some is pre 37 and some post 37. So will file this thread for future reference. Not bothered about axles and spiders, cus I know I have both variants complete in diff carriers.
Many thanks,
Martin.
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Old 03-28-2015, 06:23 AM   #29
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Default Re: Rear end swap

I am not sure Martin. Know the width of the center housing is the same and do remember swaping stuff back and forth using 36 outer housings and that is why changing the cups makes sense. If the carrier assy. is the same width on the late and early and bearing IDs are the same, you could go the way you descriged.
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Old 03-28-2015, 06:47 AM   #30
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Default Re: Rear end swap

Thanks Jim,
When I get to deal with this, I'll report my findings. Martin.
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Old 03-28-2015, 11:50 AM   #31
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Default Re: Rear end swap

Coopman.....on the teeth count; are you sure 39 is a 3:54? The math doesn't work out if the numbers are stamped 9 39. The other two ratios compute.
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Old 03-28-2015, 12:12 PM   #32
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Quote:
Originally Posted by dean333 View Post
Coopman.....on the teeth count; are you sure 39 is a 3:54? The math doesn't work out if the numbers are stamped 9 39. The other two ratios compute.
That is a good example why you can't always rely 100% on what is stamped on the bottom of the banjo housing but if you actually have 39/9=4.33, that is a ratio that was offered for light commercial pu's.

39/11= 3.54, 37/9=4.11, and 34/9=3.78.

How many teeth are you actually counting on the ring gear that's in the rear in question here??
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Old 03-28-2015, 12:58 PM   #33
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Default Re: Rear end swap

John: haven't counted yet, relayed info to the seller (not the formula, just asked for the count).
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Old 03-28-2015, 01:24 PM   #34
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Quote:
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John: haven't counted yet, relayed info to the seller (not the formula, just asked for the count).
Keep in mind that in some cases, going by ring gear tooth count, there could be two different ratios with the same number of teeth on ring gear. Check this post where I give ring gear tooth count for most of the banjo rears as listed in the Green Book (bible as some call it).

http://www.fordbarn.com/forum/showth...ear+gear+ratio
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Old 04-14-2015, 10:40 AM   #35
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Default Re: Rear end swap

I can't tell what year I just picked up using photos shown in the link from post #2, any help would be appreciated.
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Old 04-14-2015, 10:59 AM   #36
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Default Re: Rear end swap

That appears to be a '37-'40 bell, as the shackle hanger boss is BELOW the arm rather than inboard as on '41-'48s. That shock bracket is not factory. DD

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