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Not too big of a deal.
Remove driveshaft from vehicle.
Disconnect any electrical wiring from transmission.
Remove gear shifter.
Support transmission on a transmission jack, or a good sturdy floor jack.
Remove rear transmission mount, and crossmember.
Lower transmission slightly to help gain access to the engine-to-trans bolts.
Unbolt slave cylinder and hang it out of the way.
Remove engine-to-transmission bolts, and bouncer bars (if equipped)
Slowly pull transmission away from engine. If it's stuck, double-check to make sure all the bolts are out, then try raising or lowering the trans a bit with the jack and/or pry in between with a pry bar to help break it loose.
Remove transmission from vehicle.
DON'T lose the dowel pins! They are needed to line up the engine to the trans properly.
Remove clutch pressure plate from flywheel, and remove pressure plate, and clutch plate.
If the rear main seal is leaking (behind flywheel) NOW is the time to change it (cheap $10 part)
Installation is in reverse of removal.
You will need to remove the motor mounts and jack up the engine and remove the passenger side tire to be able to get it out. the starter is only 2 bolts. Not hard just time consuming. Disconnect the battery before starting the process. The bolts on the starter are easily accessable you will have to raise engine to be able to get it out.
About the heater core, in the manuel I bought at Auto zone, it gives all the steps and bolts necessary to unloose. The dash will swing out at the bottom, don't forget to remove the bolts under the speaker covers.
disconnect battery, put cars on jack stands, remove tires, remove axle nut on both axles, unbolt lower ball joint, pry down to remove from knuckle, side strut to remove shafts from trans, unbolt starter, bell housing bolts, clutch slave cylinder,support motor, pull back and turn trans about 8 degrees counterclockwise lower trans, remove pressure plate bolts to remove plate and disc,
2.2L Engine remove protective shields as needed then remove front exhaust pipe. Remove the brace from the engine to the clutch housing, then disconnect starter wiring. 4.3L Engine 2 wheel drive just remove the right front tire and you will have access to the wiring. 4.3L Engine 4 wheel drive you must remove the differential carrier shield if equipped then remove the starter bolts and rotate the starter to get access to the wiring. Good Luck.
Hi Terrie- You can go to '94 GMC Somoma Repair' and there are numerous sites. But I think you have to remove the 4 prong wire (may have to wait for entire unit before removing red lead?) and crossmember (only 4 bolts?) and/or then loosen 1 bolt then remove other-thenstand it up and turn around before you slide out and down. Not that big-o-deal but it helps to know before you go in(you can call |GMC and ask Service Dept. Good luck and God bless