Need to lower a CI drain for disposal

[EivlEvo]

Greetings all... I'm a longtime ghoster on this site, and now being a homeowner have some questions.

The house we bought has a newly remodeled kitchen (I believe mostly done by small schoolchildren)... we knew this going in, and I have a strong DIY skillset.

One of the first things I went to do was install a garbage disposal. Upon assessing the undersink PVC plumbing (which was leaking badly due to poor installation) and removing said PVC, the undermount sink actually fell out. I re-epoxied and sealed this up, and now am back to the disposal. The waste outlet on the disposal sits MAYBE 1/4" above the drain (which runs horizontally into the wall to the right approximately 4 feet. It is making the correct 1/4" grade, but it connects into the cast piping in the wall with a "normal tee" (not sure if this should be a sani or not?). This tee regardless is what I need to lower by an inch or two so that I can install our disposal.

2 Questions.

1. How should I go about this? Should I first support the vertical piping, get the angle grinder/sawzall into the pipe, and remove the tee. Once that's out, insert a CI (or should I use ABS?) sanitary tee using the steel banded AND stainless wrapped no-hub couplings on the top and bottom? Or is this just asking for trouble? (Worth noting that the house is a split level and this would be in the lower floor)

2. Do disposals have higher waste outlets? I feel like ours is pretty high on the disposal (wasteking legend 8000)... and I have it on the higher sink basin. Either way... it's worth knowing the proper way to do such a thing would be.

Thanks, sorry for the essay.

 

[Stuff]

Smaller GD will raise outlet an inch.
Diagrams with dimensions are on their home page: http://www.waste-king.com/

 

[Sponsor]

 

[hj]

The outlet height of disposers, other than the switch in the inlet models is pretty standard. I would not worry as long as the disposer outlet is ABOVE the drain in the wall, although it takes some creativity to get it connected PROPERLY.

 

[EivlEvo]

It isn't above it. The top of the outlet pipe sits MAYBE 1/4" above the top of the drain pipe. That leaves me with 1.25" of water in the pipes unless I'm mistaken?

Additionally, I checked the WK website, and most of them are listing a 10" drop? I have heard that other disposals sit higher, but tbh... I truly enjoy this disposal. In reality... if I need to replace it... that's what I'll do. But IF I were to attack the drain height, how might I go about doing such a thing?