In the process of installing a 4L60E transmission in my 55 210 sedan. Currently have the engine and transmission set at 3.0° down. The crossmember is not welded yet so I can still adjust it up or down. The rear differential is sitting at 0.3° up. Ideally I would want the differential to be at 3.0° up but without unbolting everything and adding shims I don't see that being possible. Is a 2.7° difference bad enough to have vibration? I can raise the transmission up to approximately 1.5° down before I would have clearance issues at the tunnel. I have also read that if they are not equal and parallel meaning 3.0 deg down to 3.0 deg up it doesn't matter how much the difference is. Being out 2.7 deg is the same as being out only 0.5°, doesn't matter how much the difference is. It is the stock rear end and all of the weight is on the car at right height. Trying to decide if I should just leave everything as is or if that's going to cause issues down the road. Thanks for any help
bryanw80
I'm surprised it's at .3. I have measured several differential housings and they all measured 4 degrees between the pads and face of the housing.
It may not be necessary, but I think I would shim the springs, but that's just me.
It may not be necessary, but I think I would shim the springs, but that's just me.
I thought the same thing just assuming from the factory that it would be up around 3 or 4°. Being that it is the stock rear end is there anything that could wear or cause it change? I don't think anything has ever been changed other than it has brand new ride tech shocks. Also I'm taking the measurement with a digital degree finder using a flat piece of steel across the flat surface of the pinion since I have the drive shaft out. Should I be taking it from somewhere else? There's not a lot of flat spots to take a measurement from.
Here are the measurements. First pic is taken on the engine balancer....3.0 deg up? Second pics at middle of the driveshaft...1.0 deg up? Third pic is taken on the rear pinion yoke with the driveshaft removed...0.3 deg down? Or do I have the up and down reversed? The transmission tail shaft is pointing down but I should say this angle isup because the engine side is higher correct... Front to back is higher?
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