I have recently swapped to a turbo 350, and last night at 1320 only when I ran on the bottle, the car just nosed over towards the top of third. The first time it did it I thought I heard some detonation when it happened. The car has not thrown a check engine since the swap, and the optispark is only about 9000 miles old. Wondering if the transmission plugs not being plugged into anything could cause something in the computer? The car has plenty of fuel (255 in tank). It could probably use new plugs and wires, just wondered if anyone knew of anything from the trans. that might cause a problem? I'll be doing wires and plugs this week.

 

Remember the TH350 has a different set of gear reatios. It may be that the car is just running out of gear. Maybe try a derrent final drive in the rear end. Maybe 3:55 or 3:73?

 

No, it's definately not gearing, I only have a 3.08 in the car now, and third gear is still 1:1 like the 4l60e. It was a very noticable loss of power as if the computer was pulling out alot of timing or I was running out of gas. It never did that with the 4l60e, so I thought maybe there was something trans/computer related. It was cooler out than any other time I have run, I am just wondering if maybe there was a little detonation and the computer pulled out the timing, that is what I am starting to lean towards, thanks.