Replacing crankshaft positioning censor

Well it all started when my 1990 Cherokee lorado 4.0 sometimes would start and sometimes not. Could not find any pattern. Replaced plugs, wires, cap, roter, coil, modual, fuel filter with the same result. Then came across this fourm (wish i new sooner). Ran a spark test when it would not start and no spart from the modual. Now going to replace the Crankshaft positioning censor. I know its on the bell housing and can see it but how do i get to it??? Do I have to drop the trany? Also , called the dealer to get a price and he said that the computer has to be reprogrammed after install. Is this correct?

Well it all started when my 1990 Cherokee lorado 4.0 sometimes would start and sometimes not. Could not find any pattern. Replaced plugs, wires, cap, roter, coil, modual, fuel filter with the same result. Then came across this fourm (wish i new sooner). Ran a spark test when it would not start and no spart from the modual. Now going to replace the Crankshaft positioning censor. I know its on the bell housing and can see it but how do i get to it??? Do I have to drop the trany? Also , called the dealer to get a price and he said that the computer has to be reprogrammed after install. Is this correct?
HI, NO YOU DON'T HAVE TO REPROGRAM YOUR COMPUTER. GO UNDER JEEP FROM DRIVERS SIDE LOOKING TOWARDS THE ENGINE YOU'LL SEE THE SENSOR BOLTED AT ABOUT 11O'CLOCK ON BELLHOUSING. I USE A 1/4 DRIVE RACHETT EXTENSION 8-10MM METRIC SOCKET NOT SURE ON SIZE THIS IS THE EASIST WAY I'VE FOUND NOYOU DON'T HAVE DROP THE TRANS. DALE QUESTIONS GIVE A HOLLER
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Thanks, will give it a shot tomorrow..