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68 AMX Front Supension

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mbwicz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mbwicz Quote  Post ReplyReply Direct Link To This Post Posted: Jun/10/2023 at 9:32am
  I know that the 70 go pack cars included heavy duty suspension, including stiffer springs.  Were the springs stiffer in the 68-69 AMX go pack cars as well?
  I am just wondering if an option in future rebuilds would be to use standard springs and stiffer shocks?  Just trying to think about what compromise would be best for some.
  Personally, I like a stiff car.  I have go pack springs in my 70 and adjustable shocks.  I'm looking forward to getting it on the road to see how I like it.

Mike

1970 AMX, one step forward, one step back. Both steps cost time and money.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sonic Silver Quote  Post ReplyReply Direct Link To This Post Posted: Jun/10/2023 at 9:36am
Originally posted by mbwicz mbwicz wrote:

  I know that the 70 go pack cars included heavy duty suspension, including stiffer springs.  Were the springs stiffer in the 68-69 AMX go pack cars as well?
  I am just wondering if an option in future rebuilds would be to use standard springs and stiffer shocks?  Just trying to think about what compromise would be best for some.
  Personally, I like a stiff car.  I have go pack springs in my 70 and adjustable shocks.  I'm looking forward to getting it on the road to see how I like it.

Mike

It should be fine as long as your fillings in your teeth aren't already loose.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sweatlock Quote  Post ReplyReply Direct Link To This Post Posted: Jun/10/2023 at 11:12am
‘70 is kinda/sorta a different animal with the upper/lower ball joint suspension. I’m sure several things changed as a result, including spring rates. So comparing ‘68/‘69 to ‘70 is kinda apples and oranges. 

I have seen a few period reviews of the ‘70 AMX/Javelin that stated that the ride/handling actually suffered slightly as a result of the change from trunnions to upper balljoints. On the other hand, period reviews of the ride & handling of the ‘68 and ‘69 AMX were, on the whole, very complimentary. 

For my $.02, my ‘69 AMX with older Rare Parts trunnions, OEM rubber bushings, stock springs, bias-ply tires, and oil-filled shocks (not gas-filled for radials) handles and rides just fine. It’s incredibly subjective though, but it’s as close as I can get to how it rode and handled new, which is what I was after. 

When you change one component in the suspension, in reality you’re altering everything, maybe for the better, but oftentimes for the worst. 


Edited by sweatlock - Jun/10/2023 at 11:14am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblinrev Quote  Post ReplyReply Direct Link To This Post Posted: Jun/10/2023 at 12:22pm
Originally posted by mbwicz mbwicz wrote:

  I know that the 70 go pack cars included heavy duty suspension, including stiffer springs.  Were the springs stiffer in the 68-69 AMX go pack cars as well?



Yes they were.

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70 AMX 360 4-speed (since 1981)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BU1 Quote  Post ReplyReply Direct Link To This Post Posted: Jun/10/2023 at 12:39pm
My $.02.

1. Rare Parts trunnions are not worth the cost. I ordered a set a year ago under the impression from their website that they would be rebuilt with factory correct bushings. Nothing could be further from the truth. I will leave it at that. Prothane bushings are faaaaaar cheaper, and work perfectly IF they are installed properly. There is still alot of misinformation floating around about installing these. 

2. I rebuilt my front suspension in a 68 AMX completely, top to bottom. Prothane bushings in the trunnions, and factory style rubber everywhere else. NAPA gas shocks. The ride is excellent.

YMMV.
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#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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Post Options Post Options   Thanks (0) Thanks(0)   Quote sweatlock Quote  Post ReplyReply Direct Link To This Post Posted: Jun/10/2023 at 3:03pm
Rare Parts trunnions may not be worth the cost now - I bought mine 5+ years ago, probably closer to 10, waaay before COVID. Couldn’t speak to what they’re like now, but unfortunately that’s true of a lot of companies these days. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Jun/11/2023 at 2:55pm
mbwicz - All the Front Coil Spring specific specs are in the 1969 AMC TSM
but it appears they are ABSENT, not in, 1970 AMC TSM, which is unfortunate.
Yes, the 68-9 AMX have three different Coil spring choices.


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