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1. i have a set of se wheels on my car and temporary rollers. I'll hit you up when i toss them in case your down.
2. when it comes to automatics it's a whole different league seeing its based on pressure systems which can be dramatically adjusted by temp. Your torque converter pretty much transfers power from the engine to the transmission and removes the power connection between the engine and transmission while stopped. This is based on a fluid pressure system that is forced by turbines within the converter. Spin the converter by reving the motor which spins the turbines inside the converter which applies fluid pressure causing the engine to connect to tranny.
if your torque converter is clogged or screwed up (worn out) u may not be getting enough pressure to fully engage the engine power (like a worn clutch). Thus the 20 mph crawl ur car does. fluid holds less pressure as it boils (the reason why we use racing brake fluid during) track days. So as the temp rises you could be getting less connection thus accounting for the lower speed.
These are your options as i see it:
1. flush the transmission - draining the fluid doesn't get all the fluid or build up out so flush the system.
2. get it diagnosed by someone who has experience with these things - automatics can be a pain in the ass thus the reason why i only know or deal with basics. anything more than a couple hundred to fix ( which it' typical more than that with autos) toss it.
3. 5 speed swap - find a transmission, pedal assembly, master clutch cylinder, master clutch line, slave cylinder, clutch kit, flywheel,trans mount (not sure if there the same), pilot bearing (should be in clutch kit), alignment tool, and basic tool it and go to town with the 5 speed swap!!!
done ranting.
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