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Re: Dream Rear End Ratio and 3D Printing
PapaDisco #1370512 Fri Jul 24 2020 06:03 PM
Joined: Jan 2016
Posts: 567
S
Shop Shark
While 3D printing gears that can handle power or torque are still a dream..........powder metal gears are common place in transmissions and driveline parts.

https://www.gknpm.com/globalassets/downloads/sinter-metals/english/drivetrain-products-english2.pdf/

https://atlaspressedmetals.com/stru...Z2rvm6gIVjsDACh3MCA2kEAAYAiAAEgKGS_D_BwE

Last edited by showkey; Fri Jul 24 2020 06:06 PM.
Re: Dream Rear End Ratio and 3D Printing
PapaDisco #1370551 Sat Jul 25 2020 01:01 AM
Joined: Jul 2020
Posts: 20
P
New Guy
My '49 3600 is for light work, with no towing. So it's mostly about getting comfortable highway speeds. Prior to me it had the 216 swapped out for a 1955 235, which I prefer to keep. I like the straight sixes a lot. I'd like to re-gear the rear, not change it to something altogether modern. The BW Overdrive is intriguing depending on how it's mounted.

Tires: I ordered up the 16x6 AM20766 Dexstar wheels. With 235/85 R16's the diameter works out to 31.7" which is 1" greater than the optional 17" wheel/tires you could originally order. The fenders look like they could take a bigger diameter still, but as wheel diameters go up, so do widths (and backspaces) which is the killer. 8R 19.5 tires are just 5.25" wide and yield a healthy 33.1" diameter.

Re: Dream Rear End Ratio and 3D Printing
PapaDisco #1370620 Sat Jul 25 2020 03:50 PM
Joined: Apr 2005
Posts: 1,773
R
Shop Shark
I can provide you with all the information you need about BW overdrive transmissions and how to make the conversion.
Send me a PM.
Fred

Re: Dream Rear End Ratio and 3D Printing
PapaDisco #1370621 Sat Jul 25 2020 04:03 PM
Joined: Feb 2004
Posts: 21,019
H
Boltergeist
If you're planning to do real truck stuff with your vehicle, a B/W overdrive trans is sending a boy to do a man's job. Get a 3/4-1 ton truck 5 speed with OD on 5th. gear.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Dream Rear End Ratio and 3D Printing
PapaDisco #1370743 Sun Jul 26 2020 03:38 PM
Joined: Mar 2008
Posts: 1,988
W
Shop Shark
Doing a 14 bolt swap or other rearend swap would probably be a better optiin than trying to re-engineer a 70 year old axle design that hasn't been manufactured in 50 years. Just a thought.

There are a number of companies that will build custom axles for one's needs. The off road guys even have full float kits for 9" and 8.8 rears.


1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
More pix on Photobucket
Re: Dream Rear End Ratio and 3D Printing
PapaDisco #1370746 Sun Jul 26 2020 04:24 PM
Joined: Feb 2004
Posts: 21,019
H
Boltergeist
Thee are plenty of Dana type 60 axles out there, and all sorts of replacement gears in a wide variety of ratios are available for them. There's no point in reinventing the wheel, especially with a manufacturing process that's marginal at best.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Dream Rear End Ratio and 3D Printing
PapaDisco #1374968 Thu Aug 27 2020 02:10 AM
Joined: Jul 2020
Posts: 20
P
New Guy
Anyone know if there is a CAD file floating around out there for the 3/4 ton rear end?

Re: Dream Rear End Ratio and 3D Printing
PapaDisco #1375407 Mon Aug 31 2020 02:23 PM
Joined: Jun 2005
Posts: 227
W
Shop Shark
If you want to get serious about this, these are the people to contact https://ptggear.com/

I've though of this for a while, but the issue is that their are primarily two camps of people that want these rear axles and different ratios.
1, us, the guys that would like some more highway friendly gearing (3.30-3.70ish sets)
2, rock crawler and mud bog guys that want to find the elusive 5.83 sets and would probably want custom 6.17's or something

Getting a custom set made is possible, but I haven't gotten any quotes yet.

The biggest financial issue you will probably run into is that you will probably need a few thousand sets made to get the cost per unit low enough for people to consider buying a set. Then you have to wonder about how many people would actually buy a set.

If I was independently wealthy, I would totally make some 3.50ish sets and sell them for cheap <$500 to whoever was interested and just take the financial hit because I love these old trucks and would like to see more of them used for everyday driving, but I'm not.


'66 c10 rust bucket, 350 nv4500 stock bellhousing, '85 c30 front suspension, h072 rear axle with 3/4 ton rear coil springs
'67 cj5 225 oddfire motor, time for disc brake conversion, offset rear dana 44, intermediate pedals and steering upgrade
'48 3804 frame and bed + '52 6400 cab and front clip + 4bt, need to put them together
Re: Dream Rear End Ratio and 3D Printing
PapaDisco #1375447 Mon Aug 31 2020 11:47 PM
Joined: Jun 2011
Posts: 3,630
E
Shop Shark
There are enough options with modern ratios, OD trans.' Brownies, etc., that one should be able to figure out what would work best, then the true answer would be road habits with and without loads.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Dream Rear End Ratio and 3D Printing
PapaDisco #1375492 Tue Sep 01 2020 02:43 PM
Joined: Feb 2004
Posts: 21,019
H
Boltergeist
There's most likely a good reason that replacement gears, and/or non-standard ratios aren't being manufactured these days. The old law of supply and demand, plus the likelihood that no manufacturer with any sense at all would tool up to produce parts for such a small, specialized group of customers comes into play. There's probably a bigger market for buggy whips, and whalebone-reinforced corsets than there is demand for those gears!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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