08-31-2010, 05:59 PM
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CC Member
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Join Date: Mar 2001
Location: E BRUNSWICK N.J. USA,
Posts: 3,841
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John What is going on with the rearend of the car?
John Martin John the salibury and dana 44 are the same case. The ring gear and pinions are the different. How are you snapping rear shafts??? It sounds like you are doing 5,000 rpm clutch drops and power shifting the car?? We have guys on this forum with 700+HP motors, cars that will run in the low tens to high nines and are not breaking rear ends. Stacy P from texas ran a 9.85 at 138 at Gateway some years back with a 307 and stock axles. Motor makes 550hp and a 250 shot on NOS. You need to either buy a car with a solid rearend or add a 4 link to what you have.
As far as going to a 30 spline axle, Mark williams or CWI has them. CWI want to build the whole center section for the rear.
This is what I did, Got a Jag center housing with 3.31 gears. Installed a detroit locker with a 30 spline stub shafts. Gone to a tight back lash of .004" This is under the min for back lash but stops breaking of gears with 3,000 rpm hole shots. 4wheel drive shops sell dana 44 carriers. Some even have a life time warrantty. Get a 30 spline carrier and an LPW rear cover for the diff case. You may have to modify the carrier holes for the ring gear. This will support the caps in the rearend and stablizer it from rocking. This should be good for about 600HP. If you can't this to stop, recomend you buy a Franklin quick change rearend that the dirt tracks use. 500+ ratios a 9" ring and pinion setup. It will fit in the rear end cradle, but you will have to modify the gastank for clearance.
The other idea is to buy a Soft-loc clutch from Mcleod and have it setup to stop the breakage. Do you any pictures of the rearends breaking?? Get the Mark williams stub shafts, they are good for 800-900HP. Rick L.
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