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T5 Swap - What flywheel to use? And what clutch? |
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Posted: Oct/22/2014 at 10:16pm |
I'm getting ready to do the T5 swap on my 68 AMX, but need to figure out what flywheel to use. It's a 390.
Currently I have a TF998 in there, and used the crank adapter. The engine was balanced and they added weight to the crank as part of the process, so I doubt my flexplate weighting is anything near stock, especially as it was a 304 flexplate. Ultimately I'll have to take the new flywheel in to have it match balanced to the flexplate. I plan to use a 77 Jeep clutch kit from RockAuto as they offer a Borg & Beck style: http://www.rockauto.com/catalog/moreinfo.php?pk=199893&cc=1309496 I'm thinking I should buy a flywheel for a 401 as it should be a good starting point for balancing, assuming weight has to come off. Will the 77 Jeep 304 pressure plate have the same bolt pattern as the 401 flywheel? Anything else I'm missing here? Thanks Edited by Greyhounds_AMX - Oct/25/2014 at 10:38am |
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1968 AMX 390 w/T5
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19692 |
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Bolt pattern is the same. I don't know much about the adapter... but a flywheel should work with it as well as a flexplate since there wasn't a difference in the crank for stick and auto. I'm assuming you have the adapter that required machining the crank. So you should be fine with the 401 flywheel match balanced to the current flexplate.
You may have to have a pilot bushing made, I'm not sure what the guys doing this swap have been using for a pilot bushing. One of the threads on e forum may say. Here's a good article: http://www.schwallers.com/Scott/AMC/64American/T5Swap.htm Says to use a 77 Jeep CJ-7 304 w/three speed pilot bushing. Edited by farna - Oct/23/2014 at 8:35am |
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Frank Swygert
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Good deal - thanks Frank.
The pilot bushing needs to be 0.668 (+ a little) ID and 1.050 OD, and the Doorman 690-043 does the job there.
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1968 AMX 390 w/T5
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White70JavelinSST
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4867 |
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If you find a 68,69, 70, or 71 390 or 401 flywheel you can toss the adaptor.
Armand |
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70 Javelin SST, second owner, purchased 1972
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scott
AMC Addicted Joined: Jul/10/2007 Location: Wildwood Pa. Status: Offline Points: 3502 |
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I tried to use a Borg & Beck on my 1970 390 when I installed my T-5Z. Hard to explain without a picture, but the rivets on the side of the disc that faces the flywheel hit the flywheel, rather than the recess in the flywheel. The end result was a clutch that would not release. I then purchased a diaphragm clutch, that disc fit correctly.
But, I bought a good, but not performance, clutch. Now, after 1000 miles or so, the clutch slips. So, I would strongly recommend NOT using that Rock Auto clutch. Buy something from a performance clutch vendor IE Hays, Ram, McLeod, Centerforce. Then carefully inspect everything as you install it. Pay particular attention to the side of the disc that faces the flywheel. There will be rivets arranged in a circle. Make sure the diameter of that circle of rivets is smaller than the diameter of the round recess in your flywheel. That way you won't have to pull everything apart a couple of times like I did. I still have to pull my car apart again to install a high quality clutch, just have to find the time. Sadly, I haven't been able to really drive it much due to the clutch. I wish I had spent more $$ to start with. A clutch is no place to bargain shop, install the best! The pilot bushing I used was part # PB-76-HD. I got this from Advance Auto. A bushing came with the new clutch set, but it looked like garbage compared to the PB-76-HD. |
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Excellent advice - thanks for chiming in here.
I'll dig deeper into the clutch thing before I pull the trigger then and get something more robust. The Centerforce DF is about $370 at both Jegs and Summit, but they don't show any others for a 77 Jeep CJ other than stock replacement types. |
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1968 AMX 390 w/T5
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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OK, how about something like this:
http://www.phoenixfriction.com/p-40576-01-0152df-stage-2-dual-friction-clutch-kit-jeep-cj-10-12.aspx It's only rated to 380 ft-lbs, but truthfully if I put that much torque to the T5 it's gonna blow anyway. It sounds pretty decent, and not too expensive at $175.
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1968 AMX 390 w/T5
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FuzzFace2
AMC Addicted Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10356 |
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Because the Center Force is a DF (duel friction) type it would be a step up from the lowest one CF makes for that Jeep. I picked the CF DF after talking to a few guys that ran that clutch in Ford's 5.0 drag racing and they all loved it. Dave ---- ps: yea you may be right the T5 may let go way before the clutch would but I did hop up the T5 when I rebuilt it. |
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TSM = Technical Service Manual
75 Gremlin X v8 for sale 70 Javelin 360/auto drag car 70 Javelin 360/T5 Street car |
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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I talked with Phoenix Friction yesterday and like them alot. After talking a bit I really think that the Stage 2 dual friction would fit the bill perfectly for me.
The pressure plate has a little heavier spring to it than stock, and the disc should start to grab on the organic material and not chatter like full ceramic would, then eventually be held with the ceramic against the flywheel once the clutch is fully released. The pressure plate is the same on they would use on Chevy 327s and 350s. |
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1968 AMX 390 w/T5
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FuzzFace2
AMC Addicted Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10356 |
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Is the pressure plate a B & B 3 finger type or diaphragm type?
The Center Force DF setup is a diaphragm type and is easy on the leg and after needing to fix my clutch linkage from a heavy PP, should be easy on linkage too. Dave ---- |
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TSM = Technical Service Manual
75 Gremlin X v8 for sale 70 Javelin 360/auto drag car 70 Javelin 360/T5 Street car |
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