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!"

[Michael Pliska]

Originally Posted by ET6201

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.

Who still makes pro gears for the 8-3/4"? Is my recollection correct that the above mentioned 1-3/4" stepped pinion is for 742 case?

Thanks,

[Dusty Lowell]

No one makes pro gears anymore for an 8 3/4. Well thats atleast what i ran into.

[ET6201]

Originally Posted by Michael Pliska

Who still makes pro gears for the 8-3/4"? Is my recollection correct that the above mentioned 1-3/4" stepped pinion is for 742 case?

Thanks,

Yes, the 2070742 case is for the 1¾" stepped pinion. The only current source of pro gears (that I'm aware of) for the 8¾" uses this pinion...

Mfr: Strange
PN: RP03987486E
Ratio: 4.86:1
Alloy: 9310

By-Run

[bill dedman]

So, it looks like the "smart money": is on the 742 case and a mini-spool???

I hate to break down this 2.73 setup in my 742, because it's dead quiet, but money being what it is these days (scarce!) and 742 cases being what THEY are these days (scarce!), I might as well do just that...but, it's going to be a 3.90...This engine combination doesn't LIKE rpms...
That's okay; it's a street car, basically....
Thanks again for all the good information, guys...

Bill

[bill dedman]

Gettin' too OLD for this *****...

Those third members are getting heavier every year; I ain't gettin' any younger, so I built a "labor-saving device" to aid me in my time of need (old age!!!)

Here are some pictures of my creation; built from a Harbor Freight tranny jack and some 3/16" steel plate, it will roll right up to the rear axle housing and adjust to the proper height and angle so you can just shove the third member right into place without having to lift the %#@*&$%#@!!! thing!!!

I also built a "cradle" to pick it up off the floor and hold it elevated so it's easily attached to the "labor saving device."

Now, I can change a third member without lifting anything heavier than a half-inch ratchet (used to elevate the jack.) Guess I could use an impact tool for that...

Anyway, here are the pictures, direct for my Photobucket account.

I THINK if you click on the "thumbnails" they will enlarge, somewwhat, for better viewing...

Bill

[bill dedman]

Maybe I'kll finally get some pictures posted this time...
We'll see...

Sorry for the delay!

Bill

[Tom keedle]

i like the cheapo tranny jack thing and i've got one, too.

btw, i bought a 742 empty case off ebay for 51 bucks + shipping....