|
|
|
Your donations help keep this valuable resource free and growing. Thank you.
|
Flywheel for 401 in 69 AMX with BW 4 speed |
Post Reply 
|
Page 12> |
| Author | |
jerryw42 
AMC Fan 
Joined: Oct/18/2021 Location: Texas Status: Offline Points: 6 |
 Post Options
 Thanks(0)
 Quote Reply
 Topic: Flywheel for 401 in 69 AMX with BW 4 speedPosted: Oct/18/2021 at 3:06pm |
|
I am putting a 70's 401 in my 69 AMX (trashed 390) that has a factory 4 speed. The flywheel does not fit. Will an aftermarket one make for a Jeep 401 conversion work?
|
|
 |
|
|
Trader
AMC Addicted 
Joined: May/15/2018 Location: Ontario Status: Offline Points: 6884 |
Post Options
Thanks(0)
Quote Reply
Posted: Oct/18/2021 at 3:26pm |
|
All the information you need to know:
Unless you have the 401's flex plate to match balance a flywheel to, your going to have to balance the the complete 401 rotating assembly.
|
|
|
|
|
SC397
AMC Addicted
Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5476 |
Post Options
Thanks(0)
Quote Reply
Posted: Oct/19/2021 at 7:26am |
$95.99 |
|
|
|
|
jerryw42
AMC Fan
Joined: Oct/18/2021 Location: Texas Status: Offline Points: 6 |
Post Options
Thanks(0)
Quote Reply
Posted: Oct/19/2021 at 9:52am |
|
Thanks to both of you for the replies. I have contacted the machine shop I use and arranged to have the engine balanced. It is apart for a rebuild so it is not a major problem. I had seen the one on Jeg's and wondered if it would work. I will give it a try and let you know the results. Thanks again.
|
|
|
|
|
SC397
AMC Addicted
Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5476 |
Post Options
Thanks(0)
Quote Reply
Posted: Oct/19/2021 at 12:17pm |
|
It works for the 1972 and latter 401's. I have bought a few of them.
|
|
|
|
|
jerryw42
AMC Fan
Joined: Oct/18/2021 Location: Texas Status: Offline Points: 6 |
Post Options
Thanks(0)
Quote Reply
Posted: Oct/19/2021 at 1:10pm |
|
I did some checking and the head casting seems to indicate it is a 74 model 401. The block is at the machine shop so I can't check it at this time. The crank flange is not flat like the 390 so I am pretty confident it is the later model and the flywheel should work. Once again, thanks to all that have responded.
|
|
|
|
|
amxron
AMC Nut
Joined: Nov/18/2011 Status: Offline Points: 295 |
Post Options
Thanks(0)
Quote Reply
Posted: Oct/22/2021 at 8:28pm |
|
Get a blowproof if you have to buy a new flywheel.
Ron.
|
|
|
AMXron
Fleet/Jeep Mgr. Orbit AMC/Jeep 50-1787 |
|
|
|
|
jerryw42
AMC Fan
Joined: Oct/18/2021 Location: Texas Status: Offline Points: 6 |
Post Options
Thanks(0)
Quote Reply
Posted: Oct/23/2021 at 9:48am |
|
I ordered the one recommended by SC397 from Jeg's. This is a stock build with no added hi-performance parts so it shouldn't be doing much time at high rpm's. Once it is running I will post a summary of how it worked out.
|
|
|
|
|
turdferguson
Supporter of TheAMCForum 
Joined: Sep/28/2021 Location: Lombard, IL Status: Offline Points: 90 |
Post Options
Thanks(0)
Quote Reply
Posted: Nov/16/2021 at 4:27pm |
|
The pic below is a Jegs flywheel. You can see the drilled holes where I had it match balanced to the flexplate that came on my 401. None of those were there out of the box.
 |
|
|
|
|
Trader
AMC Addicted
Joined: May/15/2018 Location: Ontario Status: Offline Points: 6884 |
Post Options
Thanks(0)
Quote Reply
Posted: Nov/16/2021 at 4:46pm |
|
It looks like your engine was internally balanced, just remove the weight and it would have been very close. Expensive to do, but nice to have.
By the look of it, if you want a billet neutral balance flywheel for racing in the future, it would likely not be a problem.
|
|
|
|
|
Post Reply
|
Page 12> |
Tweet
|
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Click for TheAMCForum Rules
Topic Options
Trader wrote:![Flywheel for 1972-1979 AMC/Jeep 401 V8, 164-Tooth [Externally Balanced]](https://www.jegs.com/images/photos/500/555/555-601451_2.jpg "Flywheel for 1972-1979 AMC/Jeep 401 V8, 164-Tooth [Externally Balanced]")