Identify my ring and pinion?

[austinsailor]

I have a new ring and pinion I'd like to out in my 40 Dodge sedan. The new one is a 3:54 set. I'm a bit concerned, though, because there is a date of 1955 on it. I think I've read that through 54 is interchangable. I don't know if this is a manufacturing date or year it fits or what.

Part numbers are 953579 (ring) and 953580 (pinion). I used the www.collectorsautosupply.com page to try to identify them, but nothing comes up.

Can anyone tell me what I have and if it'll fit? I'd like to know before disassembly if possible.

[Dodgeb4ya]

The 1961 MoPar supercedence book says #953579 use or superceded by #1124304. #953580 same info. Part# 1124304 is a kit consisting of your ring and pinion numbers fitting various 1941-52 Mopar 6 cylinder cars-1941 Dodge-???. Formate type gear set.

Bob

[austinsailor]

Sounds like I'm one year off. I suppose I can find a newer pumpkin and install it? I have a 49 3/4 ton rear, and a 53 half ton rear. I wonder if either will take the ring and pinion and fit my housing? I'd guess, though, that the axle splines would be different.

I'm guessing that 41 to 52 rear axles are pretty easy to come by as well.

I wonder what is different from 40 to 41?

[T120]

The Hollander Interchange lists your ring and pinion 953579 and 953580 for Dodge 37-48 exc. 7 pass. Dodge 49-52 6&8 exc 7 pass.,Dodge 53-55 6&8 and Dodge truck 37-55 1/2 and 3/4.

[austinsailor]

sounds like I need to just pull the pumpkin out of my 40 dodge parts car and put it in. if it works I'll swap it with my driver.

Thanks

[Young Ed]

The ring and pinion doesn't care how many splines the axle is. The side gears determine that. I have a later 3.73 installed into my original housing with my matching side gears for my axles.

[austinsailor]

I was thinking that if the ring and pinion wouldn't fit my pumpkin (one response indicated it would fit starting in '41), but if I found a later pumpkin to work with, I'd have to make sure it and the axles were compatible.

Another response sounds like an earlier one would also work, so maybe my 40 will work with them. There is one way to find out!

[T120]

I was a bit hasty in replying to your ring and pinion question.I took the part numbers you quoted

and looked them up in a copy of Hollander I have (22nd ed.) and it was listed as 39 tooth ring and 11 tooth pinion.

I looked up the interchange number for the ring and pinion (303) and replied to your question rather quickly.

There's a bit more to take into account and I hope this may save you some work and frustration.

I've scanned a couple of pages with some more interchange info.

The first page (15) shows a diagram of a diff. assy and also the interchange number 298 for '37 to '52 Dodge.

The second page(17) looking at 298 gives some further info on the differential cases and depending on

your ring /pinion combination there is a choice of two cases either W1229 or W1229A depending on your ratio.

For example, the combination you want to install is 39-11 which would use the W1229A case,while for a 41-10 ratio the W1229 case would be required.

The carrier assy. is the same for all and the ratio should be stamped on the bottom of the carrier.

I hope this may be helpful..Ralph

(Click on image to enlarge or Ctrl+)

Edited June 12, 2011 by Ralph D25cpe
typo

[austinsailor]

So my 4.11 uses one case, the 3.54 uses another. Do I need to find another case? is there a different offset to allow for different size gears or???

Anyone know what the difference in the cases are?

I have a 49 3/4 ton rear end. I wonder what it has? I guess I need to look for stampings on it.

I have a 49 Chrysler, but it's a complete unmolested, unrusted car. I'd have to pull the differential out of it.

[T120]

From what I gather the difference is in the thickness of the ring gear which requires a different case for some ratios.This chart is from a Canadian Chryco Master Parts List (1940-1948) and shows your ring and pinion on the top line and the case required as #670583.The case for your 41-10 is listed as #663476.Looking down the chart,the case you would require - #670583 is used in a number of models including the P15 with some ratios.

I don't want to lead you you down the garden path with this info -

Maybe someone can chime in with some more ideas...

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