A couple friends and I bought our E-rod LT4 8L90 connect and cruise packages in 2019. One is in a 71 Blazer, the other is in a 70 Chevelle convert. Mine is in a 66 C10 that I call a Cgt. I got mine on the road this season where as the others are still progressing their builds. Thought I would start a thread to help those thinking about the same package and maybe have some questions that I have answered.
My Pro-Tour build is from the ground up. Full custom chassis to my specs. Our LT4 packages came with engine and trans ecu's and wiring harness. I mostly followed GM's recommendations. The exception was tire size. They say axle ratio calibration is set for 3:42 and is suitable for 3:08 to 4:11 and tire size between 26" and 30". The rear tire I installed is 31" and I went with a 3:73 gear. I figured the trans just monitors input and output speeds so by going over in tire height the gear I chose would allow it to still be in range.
At 70 mph it does about 1800 rpm.
At 30 mph it does 1000 rpm.
Things I like- Good fuel economy
- Great power 650hp 650ftlb torque
- anyone can drive it, idles smooth
- Love that blower whine when you put your foot in it.
Thing I don't like- little traction
The trans has P R N D M. My manual is controlled with paddle shifter from PCS. I wish GM had a full auto sport mode. As I find when going at 30-50 mph going up a mountain it seems to be lugging. I find at full throttle you go faster
in D as it takes the engine to redline and shifts (it happens fast). Going through twisties the manual mode is great and rev matches going down.
Would like to hear feedback on other LT4/auto/man. owners experiences.
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Brian Hobaugh SCCA National Tour June 2014
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