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SS AMX question |
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madmax
AMC Nut Joined: Sep/18/2008 Location: grain valley,mo Status: Offline Points: 397 |
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i have owned one and restored a few. the ss/amx came from amc/hurst with the 2.23 first gear trans. there were bullitins sent out that recomended using the 2.64 trans. the ss/amx was a semi finished car for the racer to complete. it was not ready to race as delivered.
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American Heavy Metal
restoration parts and mechanical restoration services 70 amx black 1968 kaplan amx ss/racecar 1969 amx racecar 1970 trans am javelin 1969 amx white/platinum 1972 gremlin |
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rodhhrod
AMC Addicted Joined: Jul/11/2010 Location: Oregon Status: Offline Points: 1040 |
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Thanks folks, sounds like they came with the 223's and maybe change later.
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Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3760 |
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Well, no, they did come with the 2.23 transmission; not "sounds like...". This is documented in the parts list for the SS AMX and either the window sticker or similar. This has been posted online before, and I have all the info but am not going to post it. The SS AMX specific parts list says the transmission is the same as production; and the window sticker, or similar says, close ratio.... You are not going to get any more proof than this 52 years later despite what hearsay you find online and what the spreadsheet and calculator "experts" say the ratio must be. Every SS AMX probably went thru multiple transmissions a year launching at 7000+ RPM so it's doubtful that any car still has the original today to prove this- other than factory documentation. Like mad max said, there were a series of performance bulletins to optimize the cars and it was said to use the service part 2.64 gear T-10 for optimum performance. this was discontinued from production use a year prior, or more. |
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70amxvegas
AMC Addicted Joined: Apr/26/2009 Location: Lost Wages Status: Offline Points: 1791 |
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SP.....sounds like a bunch of hearsay...I was not there but I bet the drivers may have received a 2.23 but did there own thing and built their own gear box.Just like engine mods. So 2.64 with a second of 1.82 who knows .
Edited by 70amxvegas - Jan/19/2021 at 11:16pm |
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BU1
AMC Addicted Joined: Aug/11/2016 Location: MN Status: Offline Points: 1973 |
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So is this good enough to quell the cries of hearsay???????
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AMO #2726
#1 1968 AMX Rally Green 343 Z code 4spd since 1975 #02642 #2 1968 AMX Rally Green 290 N code 4spd since 2019 #02959 |
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
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I don't want to get into what was supplied or not. But I am curious about the 2.64 first gear ratio T-10. There have been numerous posts over the years that have given me the impression that the 2.64 ratio would barely survive a 290. And yet the recommendation is to put a 2.64 behind what is decidedly more than a street 401 would ever be capable of? What was the lifespan of a 2.64 in this service?
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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1970390amx
AMC Addicted Joined: Jul/11/2008 Location: colorado Status: Offline Points: 3311 |
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I have a friend with one in his AMX. Well built 401, he drives car like it belongs to someone else. At the strip and with slicks it blew the teeth off of the main drive and front gear of the cluster after about 10 runs down the track. Looking for parts to fix it seems most parts are out there, except the main drive and cluster.
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1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box |
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
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If your friend's experience is typical, how could AMC make the 2.64 recommendation in good faith? I would think you would have to have spare transmissions stacked up like cord wood if you followed the recommendaiton for even one season.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
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And the next one could break an iron ball.
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
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I appreciate the comments. There are two goals I have for my Machine, to make it more highway friendly and to make it more stop and go friendly. For goal #1 I've decided on a 3.15 rear end. For goal #2 I'm leaning towards the 2.64 transmission. With the 15" tires a Machine has, I would think this would be better than the 2.43. But I don't want to do something that is really stupid and be working on the transmission every six months. Thus all the questions about real world durability.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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