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69 Javelin |
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rodhhrod
AMC Addicted Joined: Jul/11/2010 Location: Oregon Status: Offline Points: 1040 |
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Posted: Dec/25/2018 at 9:37pm |
Have a 69 Javelin, 343 auto with Borg Warner. thought about going with a 4 speed instead, bought all the stuff now thinking I should go with a Amc 727. I am a 4 -speed guy so I don't know, is the switch from BW to 727 a big issue or worth it?
Rod |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6756 |
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If you are not keeping it stock, then a 5 or 6 speed manual or an overdrive automatic would be the way I'd be going.
You have to determine what your goals are for the change and work from there.
Many posts on these conversions. |
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Tomerekson
AMC Apprentice Joined: Jan/03/2013 Location: Leslie, MI Status: Offline Points: 213 |
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I did the BW M-11 switch to T-10 four speed in a 70 AMX, the M-11 had issues and needed a rebuild. Several items on the AMX were not stock, so I was not concerned about keeping it bone stock and made the switch to the four speed. It was costly but I found all the parts needed over time. The car is lots more fun to drive with a four speed - I think Jay Leno said something like "you ride in an automatic, you drive a four (or 5 or 6) speed." I believe that there are issues installing a 727 in a car with the pre-72 V-8 crankshafts, others will know whether it is worth it or not.
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1966 American HT, 401 with STR 11, T10
1979 Spirit GT, 401, T10 1975 Hornet Hatchback, 440 c.i. stroked 401, to be an LSR race car 1930 Essex coupe, to be a 401 with 3 deuces, TKX 5 speed, hot rod |
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5370 |
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Rod,
If you bought all the stock stuff, it is a slam dunk to swap it.....you just need to modify the floor to get the hole proper for a 4 speed shifter.....I have converted many 68-70 AMX/Javelin's over the years. I have done the BW M-11/12 conversion to TF 727, the crankshaft requires adapters or you have the machine the crank flange. You will need the special speedometer cable to adapt the early speedometer head to the TF 727. Driveshaft will need to be cut/welded and rebalanced. You will need to make a linkage from shifter to transmission....there is nothing available to buy. Not easy to go TF727, just think if you bought all the parts for 4 speed then, save yourself additional money and make it a stick car!!!
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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White70JavelinSST
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4867 |
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Switching from auto to manual means you will be searching for parts, bellhousing, throw out lever, and bearing, clutch and brake pedal assembly, clutch linkage, a flywheel that matches your engine, clutch disc and pressure plate, trans mount, driveshaft, the trans, (go with a World Class T5 for fun and affordability) a shifter, shifter boot, and probably something I can't think of now. It's not a difficult swap, just time consuming finding all the parts. The manual does make the cars a lot more fun to drive in my experience.
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70 Javelin SST, second owner, purchased 1972
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5370 |
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One last bonus in switching from BW M11 that would be behind a 343, is you can reuse the driveshaft and yoke with no modification......the M11 yoke and T-10 yoke are the same part!! No need searching for that!
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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ccowx
AMC Addicted Joined: Nov/03/2010 Location: Yukon Status: Offline Points: 3510 |
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Going to something stock for the car, even if yours does not have it, is easier because you just need the parts, very little fabrication. 4 speed is easier overall. By extension, so is a five speed, since the drive shaft is not hard to modify. The hard bits are adaptors and flanges and such.
As for the BW vs a 727, the BW gets badly maligned. It is not a bad tranny, it's main sins are that there are no aftermarket mods or parts available, and it is heavy. Yes, the TF is lovely and tough as heck, but it is still a 50+ year old 3 speed auto. The BW shifts nicely and will handle the power of a 343 nicely. Thousands of dollars and fab work for a TF is a low return item unless you are racing. Then it is worth it. Chris
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5903 |
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If thinking of going to a 727 why not go to a beefed-up 998 instead?
I went from M11 to 727 in a '69, would of gone beefed 998 if i knew then what i know now.
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rodhhrod
AMC Addicted Joined: Jul/11/2010 Location: Oregon Status: Offline Points: 1040 |
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After thinking and reviewing all the comments, it has been confirmed to stay with what we have and enjoy it. Why try and fix something that is not broke. I do want to thank Ross for some of the parts I received from him and also the advice. So thanks to all for your comments, now I have to decide how to sell all the is stuff as a package or individual. Anybody have a 68-69 Javy auto and want to convert to a 4 speed, I do believe I have it all including a 343 and 390 flywheel. LOL I do have it all but I know I need to post in the for sale section.
Oh well. I am am a bad boy. Happy new year Rod |
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3285 |
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I have a Torque Command 8 in my '69 AMX and I like it. Car was originally a 343/Borg-Warner and is now a '72 360 w/ the later tranny. It's not that uncommon of a swap and it's still using factory parts, although for a later model. The shifter linkage is easy with a turnbuckle located between it and the tranny linkage - it looks factory and works well. What's a little trickier to get right is the linkage from the carburetor to the transmission that controls the line pressure - perfectly doable, though. The correct speedometer for the conversion is available from APD.
Edited by sweatlock - Jan/06/2019 at 8:39pm |
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