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-   -   401 swap (https://forums.off-road.com/jeep-full-sized/77999-401-swap.html)

**DONOTDELETE** 07-09-2001 01:31 PM

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?


3jeepguy 07-09-2001 06:19 PM

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

jeep the first 4 wheel drive the only 4 wheel drive http://bbs.off-road.com/wwwthreads_u...8288825673.jpg

ozarkjeep 07-09-2001 06:58 PM

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




OzarkJeep

"Bare foot girls, dancing in the moon light..."

**DONOTDELETE** 07-13-2001 03:42 PM

Re: 401 swap
 
The Tranny is a TF727.Any info is helpful


**DONOTDELETE** 07-13-2001 03:48 PM

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.


**DONOTDELETE** 07-16-2001 11:27 PM

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.

http://www.jeep-shop.com


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