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What would the best rear ratio be for good MPG? Would it be the 2.76 or dose the engine do better at a few more rpm's? Is there a good swap for the original tranny (automatic 1974) that would have 4 gears with overdrive?
If we say 4 gears WITH overdrive, meaning basically a 5 speed? Not sure we have anything to make that work without large mods, at least in the automatic realm. (Dan take it from there
)Now if what you mean is a 4 speed TOTAL transmission, the 4th gear being OD, I dont know off the top of my head if there is an auto trans that will work with our cars (Dan would probably know) but I do know that an A833OD manual transmission will give the same results (you just get the fun of shifting) in which case you would proabably want to opt for the 3.23... otherwise (i.e. 2.76) you may not be turning enough RPM @ speed limit to make it up a hill, and depending on where you live/how you drive, you may also find yourself in the power valve alot.
A 3.23 or maybe even a 3.55 would be spectacular for the overdrive trans, whether it be auto or manual...
Here is something that Ceej, Fopar and I are working on...
An external solenoid operated overdrive unit, that will bolt to the tailshaft. We were informed that there is a company who sells basically a universal overdrive unit (Ceej can fill in on the company name if he sees this), which is identical inside and out to a late 70s early to mid 80s Volvo overdrive unit.
Wishing Id known this earlier.... having had 3 cars with these overdrive units... I could have pulled them and saved myself the effort I have to put out now to find some. Just something else we are working on.
From what I've learned so far, (correct me if I am wrong) with a stock trans and engine, a 2.94/2.93 is awesome. I have the 2.76 myself, but it hurts intown getting the car to "jump" out of the way sometimes.
~THOR~