Steel caps for 8.75" Mopars???

[ET6201]

Originally Posted by bill dedman

Gotcha...
I have a 742 case on the floor in the garage. Got a 2.73 in it.... Bonneville, here I come!!!

No, I'll start buying parts for it as soon as there's some loose change around here; just spent each dime I could afford on a new driveshaft and that crush sleeve eliminator for the 489.

Now, lets see if this ol' 360 can do any damage to this much-maligned 489... LOL! New tires comin'...

Thanks, everyone, for all the good advice!!!

Bill
PS Al, mine's a 4.10, too...

I've found the tapered pinion is ok, as long as the crush sleeve is replaced with the spacer. The last time I checked, the only pro gears for the 8-3/4" were for the 1-3/4" 'stepped' pinion gears (4.44 and 4.86:1 ratios). That's the only reason I went away from the tapered pinion.

I think the weak link is the differential. I've had both late and early Suregrips ('68 & '69 340-S Barracudas) and burned up both. As the late style wears out, it deposits trash in your gear oil. The ring & pinion don't like that.

The early type (that uses clutches) lasts longer. Another advantage is that you can just throw a new clutch pack at it, and be on your way. A machinist friend (L.D. 'Dennis' Smythe) has rebuilt the late 'cone' style but it involves milling some material off the small end of the cones and installing taller springs.

Early style Suregrips are hard to find, and expensive when you find one. On the other hand, spools are easy to find, and VERY hard to break!

Bryan (aka By-Run)
"Be a good sport at the drags...
help your competitor O-U-T!"