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model 20 answers

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BDCVG View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BDCVG Quote  Post ReplyReply Direct Link To This Post Posted: Jul/29/2020 at 8:47pm
You are bouncing off the clutch plates. They are not aligned with the spider gear teeth.
1970 AMX 390 5 spd full Control Freaks front and rear suspension
2014 E63 AMG-S wagon
1965 Austin-Healey 3000 MK III              
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 12:25am
Originally posted by BDCVG BDCVG wrote:

You are bouncing off the clutch plates. They are not aligned with the spider gear teeth.

The axle never touches the clutch plates, they are splined to the case and the outside of the spider gear. My guess is the thrust block is out of place
1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BDCVG Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 7:07am
Yep I said that wrong, the plates have tabs the fit in slots. The clutch discs have no tabs but are splined. You are bouncing off those. They are sandwiched between the plates.
1970 AMX 390 5 spd full Control Freaks front and rear suspension
2014 E63 AMG-S wagon
1965 Austin-Healey 3000 MK III              
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve_P Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 9:58am
Originally posted by 1970390amx 1970390amx wrote:



Not to be critical, but as an FYI for others, for backlash you want the indicator stem as close as possible to tangent of the OD of the ring gear. At a 45* angle, about as shown, you are introducing a 41% error: .010" actual backlash will read .014" on the indicator.

EDIT after rereading today: At 45* the indicator will read 41% low (not high as I said above)
.014" actual backlash will read .010" on the indicator at 45*.

Edited by Steve_P - Jul/31/2020 at 11:43am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve_P Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 10:02am
Originally posted by knightflight knightflight wrote:

Ok, so adding up everyone's comments, this is what I am coming up with.. First off, I do not see any thrust block or pin in the exploded view in the TSM for the twin grip, only for the std rear end, But I do see what you mean by them in the two photos. Also, I think your last comment is correct. I think the two sets of splines are not aligned. I think that is what the TSM is referring to on the twin grip when they say do not pull one axle out and move the other or they won't go back in. You say the parts could have wear resulting in this, but the TSM seems to indicate it will happen with new parts......


The thrust block is shown in the 68 TSM LSD exploded view; pg 11-19
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 1:42pm
Originally posted by Steve_P Steve_P wrote:

Originally posted by 1970390amx 1970390amx wrote:



Not to be critical, but as an FYI for others, for backlash you want the indicator stem as close as possible to tangent of the OD of the ring gear. At a 45* angle, about as shown, you are introducing a 41% error: .010" actual backlash will read .014" on the indicator.

You are correct, I should be more careful with pictures. Sometimes fixing something and taking pictures get in the way of each other and the result is less than perfect.
1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve_P Quote  Post ReplyReply Direct Link To This Post Posted: Jul/31/2020 at 11:40am
Originally posted by 1970390amx 1970390amx wrote:

Originally posted by Steve_P Steve_P wrote:

Originally posted by 1970390amx 1970390amx wrote:



Not to be critical, but as an FYI for others, for backlash you want the indicator stem as close as possible to tangent of the OD of the ring gear. At a 45* angle, about as shown, you are introducing a 41% error: .010" actual backlash will read .014" on the indicator.


You are correct, I should be more careful with pictures. Sometimes fixing something and taking pictures get in the way of each other and the result is less than perfect.


Oops, rereading this, there's typo/fail in my reply, sorry    At 45* the indicator will read 41% low (and not high): .014" actual backlash will read .010" on the indicator.
And again, not being critical, thanks for posting the pics and all the info...

I'll edit my prior post
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve_P Quote  Post ReplyReply Direct Link To This Post Posted: Jul/31/2020 at 11:47am
These pics kind of explain how you can do the pinion height setting without the factory tool, but get the same results. It involves some fifth grade math, and basic measuring tools, but not a lot of expensive dedicated tools.

1-2-3 blocks and a custom indicator bar are used





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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mr_AMC Quote  Post ReplyReply Direct Link To This Post Posted: Jul/31/2020 at 1:43pm
 Following..  since I have NEVER done a rear axle before
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Post Options Post Options   Thanks (0) Thanks(0)   Quote racerrick Quote  Post ReplyReply Direct Link To This Post Posted: Jan/31/2021 at 10:48am
Question for the group.  I removed the axles from my 70 amx and these came out also. Any way of putting them back in without taking the differential apart?
70 bbo amx 69 javelin
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