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#822999 - Sun Feb 05 2012 12:33 AM Re: Taint no such thing as new 3.90 or 4.10 gears!!! [Re: 1951Chevy1Ton]  
Denny Graham  Offline
Extreme Gabster
Joined: Oct 2006
Posts: 10,612
Sandwich, IL
Sure you can send me some pics but as I've said, I'm not an expert, just tellin' what I've seen and what my research has turned up.


DG



#833838 - Sat Mar 10 2012 03:23 AM Re: Taint no such thing as new 3.90 or 4.10 gears!!! [Re: Denny Graham]  
GMCpanel  Offline
Shop Shark
Joined: Apr 2002
Posts: 2,664
Springfield, MO
It doesn't look like it's been mentioned in here, but the gear sets are also marked on the edge of the ring gear. That's how I found my 4.11 pumpkin in a pick-n-pull junkyard years ago. The dome cover on the other side of the banjo axle comes off easily, and it's then simple to use one tire to spin the axle until you can find the markings - as long as the driveshaft is disconnected or the transmission is in neutral.

From what I've read, the 3.90 gearsets were only used in one fancy trim level truck for one year, and are consequently incredibly rare. The 4.11s, while not common, are far more likely to be located than the 3.90s. If you want to get really ridiculously rare, try finding a Detroit Locker unit. They went out of production as soon as the Eaton axle design was dropped in the early 70s.


Get a REAL truck, get a GMC! www.oldgmctrucks.com
1954 GMC De Luxe COE

#833853 - Sat Mar 10 2012 04:05 AM Re: Taint no such thing as new 3.90 or 4.10 gears!!! [Re: GMCpanel]  
LONGBOX55  Offline
Master Gabster
Joined: May 2006
Posts: 9,470
DANVILLE IL
The Detroit Locker was offered in the Spicer/Dana 60 and 70 in GM trucks well into the '70s. The "3.90" 3/4 ton axle doesn't exist as an oem option in GM products, only as an aftermarket gearset that's no longer made.


Bill Burmeister

#833902 - Sat Mar 10 2012 06:21 AM Re: Taint no such thing as new 3.90 or 4.10 gears!!! [Re: LONGBOX55]  
GMCpanel  Offline
Shop Shark
Joined: Apr 2002
Posts: 2,664
Springfield, MO
Originally Posted By LONGBOX55
The Detroit Locker was offered in the Spicer/Dana 60 and 70 in GM trucks well into the '70s. The "3.90" 3/4 ton axle doesn't exist as an oem option in GM products, only as an aftermarket gearset that's no longer made.


Detroit Locker units have been made for all sorts of axles, but the specific version for the Eaton banjo axles is difficult to find.

From the best information that I've found, there was a factory 3.90 gearset for the HO52/72 axle, but it's rare as hens' teeth. Supposedly, it was only available on 1970-ish big block automatic 3/4-tons. Long ago I spoke to someone who found one "in the wild," but that's the only one I've heard of. I'm sure that 1969/70/71 BBC 3/4-ton autos aren't exactly common.

Last edited by GMCpanel; Sat Mar 10 2012 06:22 AM.

Get a REAL truck, get a GMC! www.oldgmctrucks.com
1954 GMC De Luxe COE

#833919 - Sat Mar 10 2012 07:57 AM Re: Taint no such thing as new 3.90 or 4.10 gears!!! [Re: GMCpanel]  
BC59  Offline
Shop Shark
Joined: Sep 2011
Posts: 432
N.E. Oregon
Chev also use some spicer / dana axle behind the 396 / 402 in 1969/70/71


BC

#838150 - Sat Mar 24 2012 05:23 AM Re: Taint no such thing as new 3.90 or 4.10 gears!!! [Re: BC59]  
Highflyer  Offline
Shop Shark
Joined: Feb 2003
Posts: 562
Calgary, Alberta
Just picked up my 4.10 gearset fron Ryan Pope. A nicer gentleman you will never meet.
Thank you very much, Ryan. Well worth the drive. :-)
Quite a nice yard (for a stovebolter, lol) with lots of projects. He likes diesels. Nice installs.


Current fleet (subject to change w/o notice)
\'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 1986 Jaguar XJ-S, 89 Cavalier Z24, 96 Pontiac Sunfire GT, 2010 Jeep Patriot. No, they don't all run.
My other ride is a (B737)no, (B767)no, A320.

Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.

#838233 - Sat Mar 24 2012 03:58 PM Re: Taint no such thing as new 3.90 or 4.10 gears!!! [Re: Highflyer]  
Tango  Offline
Shop Shark
Joined: Mar 2011
Posts: 856
Texas
Hey Highflyer --- is that 4.11 set for your '49? And was it off-the-shelf or custom cut? Did a quick search but didn't see any other references.


1946 1.5-Ton Chevy Shorty Bus
In the Stovebolt Gallery
More pix on Flickr

All my best --- Tango

#838358 - Sun Mar 25 2012 01:20 AM Re: Taint no such thing as new 3.90 or 4.10 gears!!! [Re: BC59]  
LONGBOX55  Offline
Master Gabster
Joined: May 2006
Posts: 9,470
DANVILLE IL
Originally Posted By BC59
Chev also use some spicer / dana axle behind the 396 / 402 in 1969/70/71

Yes. They had a 3.54 gearset in them. The Heritage site also lists it being available in '68 in 3/4 tons with the 396.


Bill Burmeister

#838365 - Sun Mar 25 2012 01:33 AM Re: Taint no such thing as new 3.90 or 4.10 gears!!! [Re: GMCpanel]  
LONGBOX55  Offline
Master Gabster
Joined: May 2006
Posts: 9,470
DANVILLE IL
Originally Posted By GMCpanel
[quote=LONGBOX55]The Detroit Locker was offered in the Spicer/Dana 60 and 70 in GM trucks well into the '70s. The "3.90" 3/4 ton axle doesn't exist as an oem option in GM products, only as an aftermarket gearset that's no longer made.


Detroit Locker units have been made for all sorts of axles, but the specific version for the Eaton banjo axles is difficult to find.

From the best information that I've found, there was a factory 3.90 gearset for the HO52/72 axle, but it's rare as hens' teeth. Supposedly, it was only available on 1970-ish big block automatic 3/4-tons. Long ago I spoke to someone who found one "in the wild," but that's the only one I've heard of. I'm sure that 1969/70/71 BBC 3/4-ton autos aren't exactly common. [/quote] Actually, the big block 3/4 tons are quite common. Especially in Camper Special form. Almost every single one I've seen had a Spicer rearend, oor the 4.10 geared Eaton. The only listing I've found for a factory built Eaton with 3.90 gears was for the '55 1rst and early '55 2nd Napco conversion for 1/2 tons, which used the 3/4 ton axle for the front. Otherwise, GM shows no listing for that ratio in 3/4 or 1 ton.


Bill Burmeister

#838388 - Sun Mar 25 2012 03:21 AM Re: Taint no such thing as new 3.90 or 4.10 gears!!! [Re: LONGBOX55]  
Highflyer  Offline
Shop Shark
Joined: Feb 2003
Posts: 562
Calgary, Alberta
No, it's a normal center section from a 67-72 3/4 or 1 ton big block automatic.


Current fleet (subject to change w/o notice)
\'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 1986 Jaguar XJ-S, 89 Cavalier Z24, 96 Pontiac Sunfire GT, 2010 Jeep Patriot. No, they don't all run.
My other ride is a (B737)no, (B767)no, A320.

Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.

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