Re: Clint and Paul, repost from last forum


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Posted by Paul (in NY) on Thursday, February 22, 2007 at 22:51:45 :

In Reply to: Clint and Paul, repost from last forum posted by Tim Holloway on Thursday, February 22, 2007 at 22:08:15 :

On my trucks with a Married T case, the engine crank centerline is extended all the way thru the tranny/T case, and is parallel with the Differential Pinion Input. On your divorced T Case, the same is true, you just have a movable T case that must be also adjusted so your engine crank center line thru Tranny , then T case and Rear Differential Pinion are all parallel.

On my Carryall, my rear differential pinion is at 7 degrees up (measured factory setting). Center line thru my Engine,tranny, T case is at 7 degrees down. I am parallel. You have measured your Differential Pinion to be at 6 degrees up, and your T case output to be at 90 degrees. You are 6 degrees off Parallel on the T Case. And of course dropping the rear of the T case will then change parallel between the T case and the tranny/engine. To get everything parallel, your engine crank/tranny center line must be on a 6 degree down tilt. Your T Case Center line must also be on a 6 degree down tilt. NOT in a straight line, just everything on a 6 degrees down angle to match the 6 degrees up on the rear differential pinion input, then everything is parallel.

I consider the Rear Differential Pinion angle to be Factory Set. Its totally controlled by the welded on spring pads. The only way to change this angle is to cut off the spring pads and move them. And There is always a element of possible damage cutting spring pads off a axle housing. Or you can use degree caster shims to adjust a pinion angle. This is why I like to set my engine/drive line from the rear forward. Knowing (measuring) my rear differential pinion angle, I can then set the front of the engine at the needed height than then adjust the angle (drop) for parallel. I find this works well and quickly for me.

Now, lets say that you have the Engine, Tranny, T case, Rear Differential Pinion all parallel. You will NOT be able to get the front differential pinion parallel with the front output of the T case, this is normal. As an example, my Carryall front differential pinion sits at 9 degrees up angle (factory setting) and the front output of my T case is at 7 degrees up angle. My custom front drive shaft uses a Double Cardin joint at the T case. There is always more wear on the front U Joints due to not being parallel. But keeping your lockout hubs unlocked will reduce U Joint wear. The critical part is the main rear drive line being parallel.

Your springs will not change the differential pinion angle. Unless you have damaged springs or a permanent forward or backward spring wrap. Then the pinion angle would be changed either positive or negative degrees. Any questions on your OD mounting angle should be discussed with the company you bought it from. Since their manual gives a specific instruction, there must be a reason.

Paul



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