FullSizeJeeper
I put a AMC 74 rebuild into my 82 FSJ the other day. Once I got it fired up, I had no drive from the TF727 tranny. The first thought was I'd not installed the TC right and fried the pump and maybe the TC. Well after pulling the pan and finding the magnets looking like Chea pets I was very worried.
Well, pulled the tranny and had Chris Hansen look at it. After some sluthing we figured out what happened. The 74 motor had a T400 behind it. There was a sleeve in the end of the crank to match the TC on the T400. The pilot on the TF727 is .23 inches larger and would not fit in the end of the crank.
The result, the crank was pushing the TC into the transmission body causing excessive pressure and some serious heat, grenading the inside of the tranny in very short time period (less than 10 minutes at 2000 rpm to break in the cam)
So if you are switching a late model 360 from a jeep prior to 80 into a 1980+ drivetrain (TF727) - CHECK THE CRANK END and the TORQUE CONVERTER PILOT DIAMETER and save yourself $800 (the cost of a full TF727 rebuild!)
Live and learn!!
fuzz401
th-400 were used from 79 back
FullSizeJeeper
Yes, that is why I warn that an AMC360 prior to 80 (ie through 79) going into a 1980+ (1980 or newer) drive train. Check to make sure the crank pilot for the Torque converter is not sleeved to fit the GMC TC.
tufcj
How did U get the flexplate bolts tight with the converter not seated? I'd think you would have warped the flexplate pretty badly. :smile:
Bob
tufcj
FullSizeJeeper
Yes, it was warping the plate and causing the starter to miss engage at certain points of the wheel. Thought I had a bad starter (shucks warrenty special!). I should of realized I had a problem when had a hard time attaching the flexplate to TC. Another issue is the 82 flexblate has a wiegt for balance. The 74 engine is balanced through the dampner only.
