258 swap 79 -81 th400 - JeepForum.com
 
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post #1 of 3 Old 02-10-2002, 09:51 PM Thread Starter
diamatron
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1978 CJ7 
 
Join Date: Dec 2001
Location: ohio
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Post 258 swap 79 -81 th400

I AM CURRENTLY SWAPPING A 1981 258 FOR MY 79 258 IN MY CJ7. THE JEEP IS AN AUTOMATIC WITH QUADRATRAC. I USED THE 79 FLYWHEEL AND TORQUE CONVERTER. THE HEADS OF THE BOLTS THAT HOLD THE TORQUE CONVERTER TO THE FLYWHEEL ARE MAKING CONTACT WITH THE PLATE BETWEEN THE ENGINE BLOCK AND THE BELLHOUSING.THIS IS CAUSING BINDING THAT WILL NOT ALLOW THE ENGINE TO TURN OVER FREELY. I WAS TOLD THIS WOULD BE AN EASY DIRECT SWAP. WHATS WRONG????????

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post #2 of 3 Old 02-12-2002, 07:15 PM
hamyscj
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Take a close look inside the rear of the crank on your old motor. You will find that there is a bushing inside. It is not thick like a manual trans pilot bushing, but just a thin guage spacer bushing. The th400 torque converter has a smaller nose on it than the 999 torqueflite. Either remove the old one(good luck!!) or purchase a new one. I would suggest the dealership. Or a good machine shop could make you one. I ran into this problem when I installed a 360 from a cj with the th400 into a cj with a 999. I couldn't get them mated together because that stupid bushing was there. Took about an hour to figure it out. Hope this helps, Hamy.

One Way Up Racing
Romans 10:9
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post #3 of 3 Old 02-13-2002, 09:20 AM
coopcj7
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Diamatron
i am not sure about the other guys response but i have a 1978 cj7 with the auto and quadratrac when bolting the tranny to the block the converter bolts shouldn't rub. Are you running the th400 if so. The converter has a notch on the end that goes into the tranny oil pump housing that notch must line up with the sun gear inside the pump. if possible get up underneath and look straight at the shaft coming out of the tranny. around it is a gear that is notched as well you might need a flashlight if you dont have enough light. If you are able to line theses notches up the bushing will not be a problem.
coopcj7

Brian Cooper
1977 CJ7
Glass body

304 bored over .030
Chevy 350 coming soon (i hope)
2in lift
31" Cooper HT's
custom 2 wheel drive (temporary)
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