MO...don't quote me, but I think the '489
case came in for 1969, and, yes, I believe they were all cone type
SureGrips.
D.
----- Original Message -----
Sent: Tuesday, July 11, 2017 9:56
PM
Subject: Re: Yup, they were right.
Thanks, I appreciate that info. .. The question came up
today--when did the 489 differential come into use, and what on? And,
weren't all of those the cone type sure lock?
............................MO On Friday, July 7, 2017 at 12:19:21 AM
UTC-5, 65Val wrote:
'742 does not have crush sleeve...'489
cases do, but there is a rigid sleeve available for those.
----- Original Message -----
Sent: Thursday, July 06, 2017 9:49
PM
Subject: Re: Yup, they were
right.
More woes. The new yoke was a very tight fit and I had
a hard time getting it installed. Got in a hurry and used a socket and
hammer to pound it on. I should know better than that , but it
was at night and no other way to put it on then. SOOO, now I have a
gear or bearing whine/growl comeing from the rear at 1800-2200 RPM
in high gear under slight acceleration. ....Does a 742 differential
have a crush sleeve on the pinion ?
Also.. This differential was completly re-built with new
ring and pinion , and the clutch type sure grip overhauled. Bought
on e bay from a vendor. The sure grip worked well with old hard
street tires, but after putting on the sticky Nittos, it just lays a
little bit of rubber on the right tire track. I am using regular diff gear
oil with the Mopar additive for sure grip. I would guess the
clutch disc in the S.G. is slipping to much? Any idea's or
solutions? ......................MO On Tuesday, June 13, 2017 at
1:14:56 AM UTC-5, MO wrote:
It is a broken rear yoke, and of course ruined a U joint.
Put a ding in the driveshaft, but I think it will be OK. The
driveshaft was set up for 7290 U joints, but the diff .yoke is for
a 7260 using a combo U joint. I will get a 7290 yoke that uses
the U bolts instead of the cap straps. Crunch time as the local
car show is Saturday.
.............................. ......MO
On Monday, June 12,
2017 at 1:08:07 AM UTC-5, MO wrote:
New Nitto drag radials are mounted . First try out
of a medium launch on new heavy duty springs resulted in what I
think was the stock snubber whacking the floor and a big fuel
bog. 4 speed tranny and sure- lock I just finished
clamping the leaf springs- two on the front segment and
one on the back segment ( per side). It sure stiiffened up those
springs.
They were right-- get some traction tires and the next weak
link will show up. Still have the fuel bog. The driveshaft
let loose at I think a U joint. Stuck out on a highway, getting
towards dark , and very little shoulder. Got the car pulled to a
side road and called a tow truck. . He was able to park it right in my
garage. I was so aggravated , I didn't want to even look...afraid to
find a broken yoke and a bent driveshaft.( new).. I will find
out the bad news
tomorrow..............................MO
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