Re: Yup, they were right.

I did not know about" breaking in the clutches" with tight turns . I just drove normally and maybe a few non high stress "launches" and it worked fine...Until I put the sticky tires on and then broke the diff yoke. After a new larger billit steel yoke, I tried idle rolling in 1st gear , punch the gas , and only the right side tire would break loose--just a few feet. ..............................MO

On Friday, July 7, 2017 at 1:30:00 AM UTC-5, Dave Casey wrote:

Did you break in the new clutches by making several tight turns in each direction, or did you go straight to burnouts?

Dave Casey

On Thu, Jul 6, 2017 at 11:49 PM, MO <mic...@xxxxxxxxxxxxxxx> wrote:
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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