Had a loud noise in the front ofmy 96 blazer 4x4 when I parked it the next day mycarport was covered in oil think it came from the trancefer case where thr axle goes in

check that 4x4 transfer case is not in neutral --is selector cable connected lts known to rust out --neutral safety is safety upon starting wont stop gear engagement-- check and test the tcc solenoid -torque converter and the tcm for possible failure

No this is a bullet proof engine, but things like this do happen from time to time.

1999 Blazer. Thing's to check. 4x4 problem. There's an actuator pump under your battery plate. Make sure its in good shape and its working proper. Next check the cable that runs from the pump to the front transfer case. Then check the actuator switch on the front transfer case. Then check the vacuum lines from the front transfer case to the rear transfer case, that should be right under the drivers side door. There's also a actuator switch on the rear transfer case witch two vacuum lines run out of. Check them also, and last check your fluid level in your transfer case. Start from the beginning to the end. Don't forget to use your 4x4 every know and then to keep it up to power. Its not like the good old days. Where a pull of the lever on the floor engaged the 4x4. I hope this helps.

Is the clicking noise most prevalent when turning close to full lock?
If so, then check your front drive shafts. It could be that their joints are heavily worn.

If not, then please describe when the clicking noise is most prevalent.

Have your CV boots and half shafts checked. If these are cracked, they will dry out and cause a lot of noise when turning. Also check your swaybar links, these cause a lot of noise also, but not only while turning.

All GM have ignition coil problems , your getting too much fuel , I have seen O2 sensors and plugged catalytic mufflers too many times , be careful the next ride the vehicle will catch on fire..Try the coil first

Listen for the TCCM (transfer case control module) to "click" when 4X4 is activated behind passenger kicker panel just in front of passenger door near floorboard. If it clicks then is activating and with the new motor on transfer case that would make me think it has something to do with the 4X4 vacuum lines. If you look under the battery tray you will find the vacuum canister that activates the front hub when 4X4 is activated. take out ur battery and position it so you can still have it hooked up or with jumper cables and still see the canister and turn your truck on and engage 4X4 to see if vacuum canister activates to lock in front hub, if not just follow and check vacuum lines. Also check, ALL, fuses as there are many fuses that in my opinion are miss marked as with the logic side of TCCM is ran through the fuse marked for the Dome Light. Have also heard of parking lamps having something to do with it too... just a few suggestions from things I had to go through with mine

Sounds like the front hub bearing assembly.

sorry but your stuck with the 4l60e if you want it to be right. as for using the bravada transmission thats fine you just have to use your transfer case. your transfer case uses a switch on the dash and an electric motor on the transfer case. the bravada uses a series of sensors on the front and rear axle that sense wheel slippage and send a signal to the electric motor on the transfer case causing it to lock in four wheel drive. when the sensors dont sense wheel slippage any more the system returns to two wheel drive. that,s why they call it smart track. just unbolt your transfer case from your transmission and bolt it to the bravada transmission and install it. p.s- dont forget to at least change the front pump converter seal. for 4 or 5 bucks it,s cheap insurance against a major leak and i dont think you want to pull that transmission out again and yes i saw that happen to many times. good luck.-G.J.M

Sounds like the front axle electric actuator is bad. these are mounted on the front differential housing. they are known to go bad.