It will cause a firmer engagement of the tcc. The first trans I did this to, the tcc was on a toggle switch. This one is a 06 Duramax van,with stock tunning. I do my own tunning, so if there is any issues I can probably correct it.
The tcc solenoid inputs varible psi at the front of the valve. At the back of the valve is a spring,and return oil psi trying to push it shut. Its actually a pressure regulator.
Yea, it eliminates the pwm , and is just on or off. You can also do it with tuning,but the valve might not travel all the way. Without pluging that hole there is oil psi pushing the valve closed.
To get max psi to the tcc clutch, I pluged a hole in the separator plate,and drilled a hole in the valve body. I also replaced the tcc valve spring ,with a softer one.
I did a Tahoe swap ,and left the stock computer in the vehicle. It runs the speedometer. I deleted the abs,but probably it would have worked ? The oil pan clears the front diff just fine. I also converted to truck torsion bars and cross member.
Trying to burn off some very old slicks, at a car show. Simple 200,000 mile junkyard 5.3 with a cam and carb. Best E.T so far was 11.98 @ 114 mph,last year.
I'm running a 18 cm housing with the hx40 10 blade turbine combined with the 54 mm hx35 compressor. The lags not too bad,will light around 1800-2000 and makes 20-25 psi . If yours is a 12 blade ,it might spool slightly quicker .
The shakes most likely coming from your heavy wheel and tire combo. They probably need 6 oz of stick on weights to balance them. If the tires are good ,rebalancing should help. I used to run TSL bias ply on the road,and have experienced death wobble quiet often. I was always rebalacing...