Home » Public Forums » GMCnet » Re: [GMCnet] ~ Final Drive ~
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| Re: [GMCnet] ~ Final Drive ~ [message #225287 is a reply to message #225280] |
Fri, 11 October 2013 19:11   |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| hnielsen2 wrote on Fri, 11 October 2013 16:10 |
Carl
Has anyone used this in our GMC's
If so how was the revue?
Thanks
Howard
All is well with my Lord
> On Oct 11, 2013, at 14:01, Carl Stouffer <carljr3b@yahoo.com> wrote:
>
>
>
> Here is a neat little graphic of how the Detroit True Track differential works:
>
> http://www.jegs.com/p/Detroit-Locker/Detroit-Truetrac-Differentials/1032953/10002/-1
>
> Reviews are mixed on this unit. This has really nothing to do with the 3.21. other than having a similar planetary gear design. This one, however, transfers torque to the wheel with the best traction. I don't believe the GMC's 3.21 does that, but this might be the source of the belief that it does.
> --
> Carl S.
> '75 ex Palm Beach
> Tucson, AZ.
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Howard,
There is not one made for our application. AFAIK, there is no option for a posi in a GMC final drive other than Jim K's. There is no room in the final drive case for anything else. As narrow as that case is, it's a minor miracle that Jim's team came up with the design they did. I have Jim K's limited slip 3.70 and IT works great.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] ~ Final Drive ~ [message #225304 is a reply to message #225289] |
Fri, 11 October 2013 22:07 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Rob,
It is quite possible to put a Truetrac in a GMC final drive.
In fact, it has already been done. The problem is that
there is not room for our axle shafts. Making and using
undersize axle shafts is feasible on a one-off autocross
car, but no good on a 12.000# motorhome.
Gary Kosier
77 PB w/500 Cad
Newark, Oh
-----Original Message-----
From: Rob Mueller
Sent: Friday, October 11, 2013 8:30 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] ~ Final Drive ~
Howard,
If you plug 1975 Oldsmobile into:
Narrow Results for Detroit Truetrac Differentials
You get this:
Detroit Truetrac Differential
1971-89 GM Car
1972-89 GM Truck
28-Spline Axles
8.5'' Diameter Ring Gear
Fits 2.73 & Up Gear Ratios
Rear Only
If we could get them made for the Toronado it would be Magic!
When I was checking on getting a locking diff made by a company in Australia
I was told that the 3.07 case was too small, I suspect
that's the case with this also.
Regards,
Rob M.
USAussie - Downunder
-----Original Message-----
From: Howard Nielsen
Carl
Has anyone used this in our GMC's
If so how was the revue?
Thanks
Howard
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| Re: [GMCnet] ~ Final Drive ~ [message #225328 is a reply to message #225304] |
Sat, 12 October 2013 09:55 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Gary,
You jogged my memory, I had communicated with the guy that built that FD:
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Wayne,
I think I've got it now.
An Eaton posi for a 9" Ford diff can be adapted and made to fit in an Olds Toronado final drive by:
Make a ring gear spacer
Make two carrier bearing sleeves
Make you two new stub axles to fit the 31 splines
Regards,
Rob
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Rob
Correct, It is however a smaller unit than what olds uses on the other hand 9" ford units are used in very fast drag cars. I beat
the hell out of mine in AX and after over 250 runs and 450 hp it is still working as installed, but the car and me weigh only 2400
lbs let me know what you end up with.
Wayne
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Wayne,
Hmmm maybe I better forget about this, the GMC Motorhomes built between 1973 and 1978 weigh 12,500 pounds fully loaded.
I will contact Eaton and see what I can find out regarding how much of a load it can handle.
Thanks,
Rob
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I never bothered contacting Eaton because JimK sells the limited slip unit and I'm sure this would cost WAAAAY more to build!
Regards,
Rob M.
-----Original Message-----
From: Kosier
Rob,
It is quite possible to put a Truetrac in a GMC final drive. In fact, it has already been done. The problem is that there is not
room for our axle shafts. Making and using undersize axle shafts is feasible on a one-off autocross car, but no good on a 12.000#
motorhome.
Gary
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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