| [GMCnet] torque steer and front end` geometry [message #233933] |
Tue, 24 December 2013 20:50 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Senior Member |
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I put a 1 ton set up in a GMC for a friend this last summer. As there was so many bad parts to replace. And an Applied GMC's quad bag system on the rear. Then drove it about 300 miles. I was impressed on how well the coach handled under a variety of conditions. And I didn't experience any torque steer. I do road racing with my Yenko Stingers in the summer. Hit speeds up to the 135 MPH range. Lots of vary hard turns with 4 wheel drift's. So I pay attention to front end geometry. I make changes to the springs, shocks, tire type, and alignment to match the tracks that I'm going to. And YES Virginia, there is a relationship in the geometry of the Yenko, and the GMC. I did have concerns with the 1 ton knuckle assembly being taller then the stock unit. As this changes the relationship to each of the A frames to each other. I even made a model of the 1 ton unit as it would be installed. Then there was what appeared as a huge spacer with the unit when it arrived. Well, it isn't s
paced out as far as it first appears. You must remember that the rim that was used on the 1 ton has a difference off set then the rim used on the GMC. And the larger wheel bearings can tolerate the center line of the tire being spaced farther out from the center line of the bearings. Thus putting a heavier load on the outer single bearing. And the alum rims, with the radial tires change the loading of the bearings a lot. Radial rims are even built differently then the old bias ply rims. Radial tires can fracture bias ply rims. Back in the day. Radial rims were stamped with an R opposite of the location of the valve stem, so they could be identified. As to the spacer on a stock front knuckle assembly. I personally would not put the spacer to widen the track on a stock front knuckle due to bearing size. And the greater load put on the outer bearing. Like I said. PERSONAL choice.As to my own 78 Royale. My front end assembly is in great condition. I just felt that it was
time to replace the bearings. And have Dave Lenzi resurface the bore were the bearings are installed. I also had him put a grease fitting in the knuckle housings. So now the stock front wheel bearing units will out last me. I don't see a right, or wrong here. It's what works out in each individual case. 2 GMC's. 2 out comes. Next. Off topic. I wish everyone a marry Christmas. We all have a lot to be thankful for tonight. And one of those things is the great variety of people on this forum. Sometimes we just need to agree that we just don't agree on everything.Bob Dunahugh78 Royale4 Yenkos
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