PDA

View Full Version : Stock Differential



markm
02-14-2017, 06:21 AM
Anyone have an idea what a stock 3.36 open third member weighs, just the jug. I have a guy who wants to buy one.

Custer55
02-15-2017, 06:17 AM
I have never weighed one but had mine out to re-seal it a few years back I'd guess about half of what a Muncie 4 speed weighs or less. Maybe 35 to 50 lbs. range, just a guess though. I could be way off.
Brian

BamaNomad
02-15-2017, 06:28 AM
bathroom scales will give you a close approximation.. :) .. ie. take the scale to the garage, rather than the diff to the bathroom.. :)

rockytopper R.I.P 5-13-2017
02-15-2017, 07:42 AM
bathroom scales will give you a close approximation.. :) .. ie. take the scale to the garage, rather than the diff to the bathroom.. :)

Are you speaking from experience lol.....

BamaNomad
02-15-2017, 07:45 AM
Of course... :) but only with wheels.. not juice-dripping differentials.. :)

chevynut
02-15-2017, 07:47 AM
I weigh just about everything I ship with a bathroom scale. I've even weighed complete frames and clips on pallets. Seem simple to me, if you own a high tech piece of equipment like that. :D

markm
02-18-2017, 05:25 PM
I weigh just about everything I ship with a bathroom scale. I've even weighed complete frames and clips on pallets. Seem simple to me, if you own a high tech piece of equipment like that. :D

Thanks for the helpful reply's except the troll.

BamaNomad
02-18-2017, 05:45 PM
I weigh just about everything I ship with a bathroom scale. I've even weighed complete frames and clips on pallets. Seem simple to me, if you own a high tech piece of equipment like that. :D

you know CN... :) you don't even have to try to 'balance' your frames on the scale... It's easier if you just step on the scale, weigh yourself, then pickup the frame (or pallet) and step back on the scale... count the number of times the needle goes round, multiply by 300, then add the final scale setting... :)

chevynut
02-18-2017, 05:52 PM
I don't balance the frame, I weigh each end and add them together. :)

LEE T
02-19-2017, 11:21 AM
Anyone have an idea what a stock 3.36 open third member weighs, just the jug. I have a guy who wants to buy one.
63# clean and dry

Troy
02-19-2017, 02:39 PM
63# clean and dry

Thank you LEE T, finally someone who can answer a simple question without being a smart ass!!

markm
02-19-2017, 04:22 PM
63# clean and dry

Thank you, my guess was about 65.

chevynut
02-19-2017, 07:09 PM
Thank you LEE T, finally someone who can answer a simple question without being a smart ass!!

Anyone with a differential case in hand and access to a bathroom scale could have answered it nearly a week ago. :D

How much more does a 3.55 case weigh? :)

BamaNomad
02-19-2017, 08:29 PM
I'm of the belief that the later design ('61? and later thru '64) are of a heavier construction, and thus should weigh more if that's true... Did you have weights for both the original design and the update design?

LEE T
02-20-2017, 02:45 AM
If you are asking me, then the answer is no, I only have the weight of the exact one that markm asked for.

rockytopper R.I.P 5-13-2017
02-20-2017, 07:58 AM
I'm of the belief that the later design ('61? and later thru '64) are of a heavier construction, and thus should weigh more if that's true... Did you have weights for both the original design and the update design?

Aren't the thicker gears 1957-on? with 55-56 thiner lighter?

BamaNomad
02-20-2017, 08:52 PM
Rocky, I was speaking of the differential chunk *housing* castings, and I'm totally not sure there was a change in the Posi chunk housing casting number... or not?? I've been trying to figure that out as I have a '61 dated and '63 dated '812' P-casting posi carriers...

My understanding of the thicker vs thinner gears has to do with the ratio...

markm
02-21-2017, 06:11 AM
With all the rear ends I am used to looking at that do not use spacers, when the pinion gets fewer teeth and smaller,the ring gear gets thicker. Back in the 90s when I bought 9 inch Ford junk on a daily basis I could just about guess the ratio by looking at ring gear at a distance. I never dealt in many early Chevy jugs but I am sure same applies.

Rick_L
02-21-2017, 07:52 AM
55-56 3rd member housings were a bit lighter than later models. But I doubt if the difference is more than 1/2 pound.

55-56 ring gears are thinner than later models. When they first designed these axles, they didn't build in accomodations for 3.36 or 3.08 gears. With the bigger pinions on these gears, they had to make all the other gears thicker, and move the ring gear mounting surface on the differential case. 57-up gears and differential cases allow the 3.08 and 3.36 gears.

Also, the castings for 62-63 Chevy II axles are the same basic design, but are quite light relative to the others.

The difference between a p-case and an open case is a rib that's there on the open case which had to be removed for clearance with the posi differential. I don't think they are heavier at all. The rib can be removed to allow you to put a posi differential in an open 3rd member housing.

I don't think there's any significant difference in weight among all this stuff except for the Chevy II 3rd members. Even with that one it's only slight.