Re: 489 vs 742

[Derrick Brown <63max426@xxxxxxxxx>]

HI Bill,

Thanks for the info.

I agree on the pinion shaft differences which means that bearing  and  
seal would be different, but the carrier bearings themselvse should  
be interchangeable?

How can you tell the difference between the cone and clutch style  
suregrips?  Does the clutch type have a series of bolts going around  
it on its far right side, looking at it from the rear?

as i understand it, you can rebuild the clutch style.  can you still  
get rebuild kits for the clutch style if you have that version?


On Nov 16, 2007, at 10:16 AM, Bill wrote:

> The shaft size and style for all 3 cases are different and not
> interchangable. I've always remembered them by the letters, but I'm
> pretty sure the "X" (741?) carrier is 1.375" shaft, "9" (742?) carrier
> is 1.75"  shaft, and the "2" (489?) carrier is 1.875" shaft. Someone
> please correct me if wrong.
>
> I just remembered this link too...
> http://www.autohobbydigest.com/8_75.html
>
>
> Bill M
>
> On Nov 16, 2007 9:32 AM, Derrick Brown <63max426@xxxxxxxxx> wrote:
> > hi all,
> >
> > center section questions.
> > ive got a completely rebuilt 489 cased suregrip (bearings , ring/
> > pinion and suregrip) with new 3.55s in it.
> >
> > I want to swap to a steeper gear (likely 4.10, 3.91 minimum I think)
> > since im  running a tall tire.
> > I still have my 742 case.
> > "IF" i want to get a new 4.10 ring/pinion for the 742 case ( i think
> > all ill need is a shim kit for the pinion gear).  Will my large yoke
> > and all the new bearings , suregrip and carrier(from 489)  all swap
> > over to the older style case?
> > It is my understanding that the only difference is the ring/pinion
> > with shims (742)  versus ring/pinion crush collar (489)
> >
> > True or false, and what am I missing?
> >
> > thanks,
> >
> >
> > Derrick Brown
> > '63 Sport Fury, 4 speed
> > derrickb@xxxxxxx

Derrick Brown
'63 Sport Fury, 4 speed
derrickb@xxxxxxx