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Old 02-18-2009, 12:59 AM
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1961 Dodge town panel rear differential

i have a 1961 dodge town panel i was wondering if anyone here knows what kind of rear end they came with.

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Old 02-18-2009, 07:34 AM
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Is it a removable pumpkin or an intregal carrier with a back cover?? What size is the vehicle( 1/2,3/4,ton??)? If you don't know the last question, how many lugs does it have?
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Old 02-18-2009, 09:18 AM
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8 3/4" Sure-Grip
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Old 02-18-2009, 10:46 AM
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There was some RA36 differential's used in the early Dodge' also.Could very well be a 8 3/4 also,If its a 8 3/4 look for some cast numbers on the pumpkin that might have either a 741 or 742 as the last 3 numbers. If it's a 8 3/4 you will still need to check and see if it's a posi. They are not all Sure-Grips.
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Old 02-18-2009, 10:04 PM
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for 63 Axle, Rear - anti-spin differential (D100, 3.91 ratio; D200, 4.1 ratio; D300, 4.88 ratio. N.A. Utiline with dual wheels)
Gear Ratio will be on the tag on drivers door pillar
3.58, 3.91 or 4.56 to1 for the d100
Bodyparts are virtually impossible to find My 63 TW needs about all of them , I'm sliping a little on my knowledge of these,It was back in 04 when I was really digging into these.
Shane

Last edited by Chevrolet4x4s; 02-18-2009 at 10:44 PM.
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Old 07-28-2011, 02:06 AM
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1961 panel rearent

I have one and with a slant six,4spd mine has a 8 3/4 large stem pinion 742
hope that helped
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Old 07-31-2011, 02:46 PM
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Quote:
Originally Posted by prostreet6t9
There was some RA36 differential's used in the early Dodge' also.Could very well be a 8 3/4 also,If its a 8 3/4 look for some cast numbers on the pumpkin that might have either a 741 or 742 as the last 3 numbers. If it's a 8 3/4 you will still need to check and see if it's a posi. They are not all Sure-Grips.
Posi....is a GM short for Positrac.....
Don't know when the term Sure Grip was coined but most if not all factory 'posi' units were limited slip rears. There's one more obscure early 8 3/4 but I can't remember the casting number of it. Basically, there's two types of 'posi' rears...a Borg Warner (later years) anti spin resistant and the earlier Track Lok unit. The earlier one has clutch plates and the later has the cone and cup style limited slip unit....
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Old 08-02-2011, 06:40 PM
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Quote:
Originally Posted by cranky1
Posi....is a GM short for Positrac.....
Don't know when the term Sure Grip was coined but most if not all factory 'posi' units were limited slip rears. There's one more obscure early 8 3/4 but I can't remember the casting number of it. Basically, there's two types of 'posi' rears...a Borg Warner (later years) anti spin resistant and the earlier Track Lok unit. The earlier one has clutch plates and the later has the cone and cup style limited slip unit....
I use the term posi or limited slip loosely. In the early years you got the same end product just different parts to get there. Both side gears got preloaded to get the power to both wheels. SureGrip was Dodges name for them that started around 58 or 59 (I Think). The first unit was a PowerLok with the bolt together case. The 8 3/4 powerlok is very similar to the Dana 44 and shares some of the same parts. I believe the Borg warner unit is a version of the Auburn that we still see today in the cone version.

So those units as well as the modern Clutched units with preloaded side gears are gonna get power to both wheels going straight and when you turn corners they are a limited slip.Thats the reason I use that term loosely. To me the only REAL limited slip unit is the Chev Gov lock. When one tire spins enough it will engage the other wheel which causes the high failure rate.
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