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The Astro Van is a rear wheel drive vehicle. The Cutlass Ciera is a front wheel drive vehicle. The transmissions are entirely different and and not adaptable.
Not sure exactly what you mean but the 4t60E comes with lots of different gear ratios. Just because a replacement one will bolt in doesn't mean it will work. If you are going to replace it, it needs to be the same gear ratio. If your car has a 3.1 I think the gear ratio is 3.33 and if its a 3.4 it is a 3.06
A 4.0 transmission will not hook up to a 3.8, the bellhousing bolt pattern is different. It is possible though, that a machine shop could make an adapter plate to make your combination work.
As long as the tags on the trans have the same numbers yes, these transmisssions are electroniclly controlled and there are internal differences even though they may bolt up, there are ID tags on all transmissions sold by GM and installed on the production line.
It physically will fit and bolt up,but there are many different ratio,and drive and driven sprocket tooth counts,different final drive ratios,all monitored by the computer with electronic speed sensors.If the trans from the 95 has a different ratio than the 93,the computer will set gear ratio error codes,and possibly put the trans in a failsafe mode,stuck in 2nd or 3rd gear.On the transmission case,down by where the passenger side axle would go in,is a thin metallic tag,maybe 2"x 3",and it has bar codes,and also a series of numbers and letters.The numbers and letters,large cap,are the final drive gear ratio code.They should match on the two transmissions in question.
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