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post #1 of (permalink) Old 07-09-2001, 01:31 PM
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401 swap

I own a 81 J10 with a 75 401.The 401 leaks oil real bad and i have changed every seal i can find.I am thinking of replacing the 401 with a chevy 350 what would i have to do to make the change?

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post #2 of (permalink) Old 07-09-2001, 06:19 PM
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Re: 401 swap

you failed to say what tranny you have if it is an auto you might be able to swith it with a chevy auto if it is a manual than you gonna have to buy some adapters or swap in the entire chevy running gear from a 4x4 pickup and have custom driveshafts made

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post #3 of (permalink) Old 07-09-2001, 06:58 PM
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Re: 401 swap

Ill trade you straight across for a good running, well built chevy 350

but my conscience would bother me.

Keep the 401 or find a 360 ( easier to find same block)

just figure out for sure were the leak is and fix it

the auto in it will be a tf727 with a AMC bellhousing pattern, and if you swap to GM engine youll have to go total GM drivetrain, not an easy swap, and its not pleasing to the Jeep Gods


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post #4 of (permalink) Old 07-13-2001, 03:42 PM
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Re: 401 swap

The Tranny is a TF727.Any info is helpful

post #5 of (permalink) Old 07-13-2001, 03:48 PM
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Re: 401 swap

I have a good 350 already. About the oil leak i had the rear main seal changed about a month ago then the oil pump went out when i rebuilt the oil pump and started the truck the rear seal started to leak, could the seal have been damaged by low oil pressure? I guess i will change the seal one more time.Any input would be helpful.

post #6 of (permalink) Old 07-16-2001, 11:27 PM
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Re: 401 swap

We have found that the oil filler cap can get worn out and actually have oil blow back out around the seal inside the cap, I've also had a dipstick seal (where it goes into the tube) dry out from the heat and blow back up the oil tube. A bad pcv valve can cause enough pressure in the engine for the oil to find a way out. Other than that it seems like trouble shooting time and degreaser.

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