I don't lift vehicles. You can lower any car an inch and make an improvement in handling that the most oblivious driver in the world will notice, raising the center of gravity only makes sense for heavy duty off roading. I also did enough driveline vibration diag in the Fairmont days, I don't need to create new ones in my vehicles.
I had a 351 swapped Fairmont for a bit.
Hard to keep it straight. Fun though.
My personal truck with E rated 305s out performs a stock 88 version on the same skid pad with the 300 plus hp gas engine....that was in 2007. The load cell placement was a bit different....because it was 20 years later ..but close enough.
I was getting data for the pending diesel swap...and staff position changes never allowed access to do a post diesel swap comparison. Which was a bummer ..
The difference between the modified ttb system I ran and the straight axle was not predicted....
Stops better, goes better...takes skid g,s better.
With the diesel....I don't know, but stop didn't change to longer with the 400 pounds...but....got shorter to what I assume was due to the hydro boost swap. But it was much much much better mpg.
And weighs almost 2k more then a stock truck
I would have lost money betting on those results
Off road at speed.... The straight axle....No way...this leaf on solid axle setup sucks... The ttb blows it away...even a stock truck will run away off road.
For slow speed stuff...it's good.
Especially on shit Detroit roads...but all around interstate travel....I like my truck much better at speed on the freeway like it is now...then any bone stock ttb anything I have driven....even with the track bar removed ...which scares most people that drive it.