anybody running this differential

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trudysduster

trudysduster

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is anyone running the 913A572 Eaton Detroit Locker differential in their 8 3/4 rearend. I called Dr. Diff on the clutch type suregrip and he said he will be out of them until sometime next year and that he had this one available. It is a little more expensive but just wanted to know if it was better and what the opinions were from someone who has it. Thanks,Bill
 
That's the same style I had put in the strange s-60 I had built. Did a lot of research on it before deciding to go that way. It's supposed to operate smoothly, like not even know it's there. Unfortunately I haven't got my car on the road yet to tell you what I think. Most reviews I found on line were very good.
 
nobody else knows anything about this true trac differential. I guess I will go with my gut on this.
 
This is the one I would want. There is an article in one of the Mopar magazines where they got custom axles that touched in the middle to use oem tapered bearings as the differential is open through the center with no thrust block. I thought that was pretty slick and what I will do with mine.

Saying that it may need green bearings with stock housing and stock axle length.
 
trudysduster said:
nobody else knows anything about this true trac differential. I guess I will go with my gut on this.
Click to expand...

I have a tru trac. (S-trac)

Sensitive to tire pressure. Much stronger than a posi.

You tube it. There is a great video that shows how it works.
 
My buddy has one in his blown 4 speed 67 Valiant for about 8 years now.He is very happy with it.
 
First off, it's not a Detroit Locker. Detroit Lockers are somewhat harsh. They are either on or off. There's no in between. They make noise when they engage and disengage. Pretty loud. Some people can stand it, others cannot.

What you are looking at is a Torsen gear type limited slip unit. Detroit Locker is the name brand it's marketed under. Kinda confrooshin, really. I have no personal experience with them, but everything I have read is very positive. They operate like an open differential under normal driving conditions. The way I understand it, the more torque is applied, the more the unit "locks up" if you will.

Maybe Dr Diff will be along and impart a little more, but I believe that's how it operates. They are supposed to be very good units.
 
I've bought and installed 4-5 from Cass over the years. I don't bother with the cone or clutch type any more. They are that good. You won't wear it out, and you won't break it. Buy one, install, and have fun. Road racing, drag racing, or street.
 
everything I have read is looking like that. supposed to be an Eaton. I always ran Eaton's in my semi's in the day. But never had any in a car. looking like that may be the way I will go with the Richmond 3.55 gears and bearing kit. going to get a few more opinions here and probably get real confused.Thanks
 
this is the one I am talking about
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(1) Review This Product Differential, Eaton Detroit Locker, 30-Spline, Chrysler, 8.75 in., Each
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Not hard to figure out which one you were talkin about since you included a part number in your original post. lol
 
I cant do anything right now till I get the old rear out and figure out which spline yoke I have in the old one unless I get another one if it is wrong. I had planned on going with Richmond gear and it is a 10 spline. may have to go with a 29 spline. anybody have a guess which spline was used in a 489 case with a 2.94 open. probably would just be a guess wouldn't it. stopped in my tracks.
 
I'm using a tru track in my car. They come with a block to use with stock axle bearings. I have yet to light'em up but it sure has helped when powering through turns. As far as i can tell its basically an updated cone type suregrip.

my 489 with 2.73's had ten splines and were dated late 1969.
 
trudysduster said:
I cant do anything right now till I get the old rear out and figure out which spline yoke I have in the old one unless I get another one if it is wrong. I had planned on going with Richmond gear and it is a 10 spline. may have to go with a 29 spline. anybody have a guess which spline was used in a 489 case with a 2.94 open. probably would just be a guess wouldn't it. stopped in my tracks.
Click to expand...

I had the same question awhile back, so I emailed cass at Dr. Diff and this is what he said:

If a 1 1/8" socket fits the pinion nut, you have a 10 spline yoke.

If a 1 1/4" or 1 5/16" socket fits the pinion nut, you have a 29 spline yoke.
 
They are nothing like a cone type unit as they have no sacrificial wear surfaces and no metal to get run through the bearings and gears.
They are more money - but as I said - I've done new and refurbished clutch types, I've done brand new cone types, I won't rebuild a cone type. They all will wear out, some very quickly if the car's heavy or you do a lot of hard cornering like parking lot racing or road racing.
The Tru Trac simply keeps going. I've thrown a dyno'd 600hp with very wide Nitto 555s at it - no problems. Even pulling 1.2Gs on the skidpad. So if someone needs a sure grip - it's the tru Trac or I don't bother.
 
cudaracer said:
What is the torque spec for the 10 bolts holding the diff housing to rear end on an 8.75"
Click to expand...
If you mean the ring gear bolts, they get 55 ft/lbs. Left hand threads.
Oh yeah, Eaton TruTrac every time. Like Rusty Rat Rod stated, it will act like an open diff under normal driving, but stand on the gas & be in for a surprise.
Cheers. Gaz
 
parts ordered. Differential, ring & pinion, bearing kit should be here by Tuesday.
 
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