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Old 07-19-2005, 07:18 PM   #1 (permalink)
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D60 or D61?

I pulled a FF D60 rear from an 83 dodge ram full size van. I got the shafts out and its 30 spline. Is it a D61 or a 30 spline D60? I can't find a BOM number on the tubes, and on the pumpkin where it should say 60, it does. On the top right corner it says 30255, on the top left corner it says a20078, and on the bottom left it says A B.

Is anybody running 35spline shafts in one of these with a 35spline carrier, like a detroit or something? And will 35 spline shafts even fit in the 30 spline 60s?
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Old 07-19-2005, 07:21 PM   #2 (permalink)
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If it's got a 60 cast into it as you said, it's a 60.

As for 35 spline shafts.....measure the I.D. of the spindle bore. If it's 1.60" or larger, 35 spline shafts will slide in. If not, you can bore the spindle to 1.6" and make it work.

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Old 07-20-2005, 08:08 AM   #3 (permalink)
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The BOM on mine is on the left side (looking from the rear) in the middle of the tube below where the axle vent connects at the top of the tube. You need to scrape the paint off or it's almost invisible.

That's a rear -> []--x-o----[]

o is the pumpkin , x is where the BOM is hiding under the paint. Excuse the lame drawing - I need to buy a star.

what's the ratio on it? it's stamped on the ring gear if the tag is missing and you should probably change the gear oil anyway.

I think 61's only come with highway gears - 3.07 or something? If it's cast "60" and has normal 3.54 or 4.10 gears in it should be just that - a 60. I wouldn't worry about 35 splines until you regularly break the 30 splines. Spares are easier to find.
I have 32 spline Dodge D70, if you're interested PM me I'll give you the side gears for nothing, I don't need 'em and I think they're interchangeable with D60 side gears (Note to non-noobs: I could be wrong so don't flame unless you know for sure)
EDIT: I also have an extra 32 spline axle you can borrow to check clearance - if the 32 spline fits the 35 should too - I know for sure they used the same housing in late 80's Dodges.(you're in Atlanta? I saw post yesterday)

Last edited by BumpyDodge; 07-20-2005 at 08:25 AM.
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Old 07-20-2005, 08:46 AM   #4 (permalink)
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Quote:
Originally Posted by BumpyDodge
I think 61's only come with highway gears - 3.07 or something?
Not true. Up to 4.56 were available in a 61, that's what makes spotting them a pain in the ass. You're partially right though, anything numerically lower than 3.55 is guaranteed to be a 61 because those gears don't work in a 60.
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Old 07-20-2005, 09:17 AM   #5 (permalink)
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Quote:
Originally Posted by korda
Not true. Up to 4.56 were available in a 61, that's what makes spotting them a pain in the ass. You're partially right though, anything numerically lower than 3.55 is guaranteed to be a 61 because those gears don't work in a 60.
But don't you need to special order those gears (thick) or use a spacer?
Did they actually use a 61 with decent gears in any factory application? Dodge has been known to use "leftover" parts, so it sounds plausible. I've just never seen one. Do 61's have a blank casting or are they cast with "60" on the pumpkin? I'm no expert, and don't mind learning something. There's a diagram with the carrier to cap dimension to measure I've seen so I'm guessing they're left blank or misleadingly cast "60" otherwise it would be a no-brainer.
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Old 07-20-2005, 09:39 AM   #6 (permalink)
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[QUOTE=BumpyDodge]But don't you need to special order those gears (thick) or use a spacer?
\QUOTE]

Yes, I believe the combination is a 3 series carrier and a spacer to run a standard gear set. Maybe this is true or not for all D61's, but the ones I have seen have large tubes that do not neck down like a D60 rear. Also the back hub bearing is larger that the outer on the ones I have seen.

Last edited by CJeep77; 07-20-2005 at 09:41 AM.
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Old 07-20-2005, 10:26 AM   #8 (permalink)
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Thanks for the info, but there's some B.S. misinformation in there too
Quote:
Gotta watch out for those 61's. 'Course, they are easy to spot since the number 61 is cast right into most of the cases!

Dodge CTD's of the late 80's and early nineties run these in the front almost exclusively.

Andy
I think he thought because the BOM starts with 61XXXX it's automatically a D61

Last edited by BumpyDodge; 07-20-2005 at 10:28 AM.
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