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 -----

From: MO

To: The 1962 to 1965 Mopar Mail List Clubhouse

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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