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2.87s to 3.15s, need help, with set up?
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amc401t10 View Drop Down
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Points: 903 		Post Options Post Options   Thanks (0) Thanks(0)   Quote amc401t10 Quote  Post ReplyReply Direct Link To This Post Posted: May/23/2017 at 3:10pm
ok benn busy with family.
back to car, after trying everything from .040 to .180 shims behind the pinion race I have determined
I must have a bad gear? the reading on the drive side of the ring was to the outside of ring , but get this the reading on the coast side was toward the center. ive ordered a 3.54 from summit .
ive pulled the rear and have it on jack stands cleaning it and getting it ready for new gear and bearings.
should have pulled it out to begin with but sometines I think I'm 20 isstead of 59.
1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727
84 j10 ,360, 727
1970 4-door rebel sleeper(455 pontiac,turbo 400)
79 spirit,4.2
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Points: 4084 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tufcj Quote  Post ReplyReply Direct Link To This Post Posted: May/23/2017 at 3:30pm
Are you sure the old gear ratio is 2.87 and not 2.73? The 2.73 used a unique carrier that is different from the 2.87-up. Since the 2.73 pinion gear is larger, the ring gear is further from center, which would explain why you're having to shim it so thick to get a pattern.

Bob
tufcj
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Points: 903 		Post Options Post Options   Thanks (0) Thanks(0)   Quote amc401t10 Quote  Post ReplyReply Direct Link To This Post Posted: May/23/2017 at 4:37pm
43 and 15 tooth count?
2.866666
1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727
84 j10 ,360, 727
1970 4-door rebel sleeper(455 pontiac,turbo 400)
79 spirit,4.2
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Points: 903 		Post Options Post Options   Thanks (0) Thanks(0)   Quote amc401t10 Quote  Post ReplyReply Direct Link To This Post Posted: May/24/2017 at 5:51pm
gear came in today.
still cleaning and painting the housing.
hope to install by weekend.
1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727
84 j10 ,360, 727
1970 4-door rebel sleeper(455 pontiac,turbo 400)
79 spirit,4.2
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Points: 903 		Post Options Post Options   Thanks (0) Thanks(0)   Quote amc401t10 Quote  Post ReplyReply Direct Link To This Post Posted: May/30/2017 at 4:03pm
got the rear end out of car , new pinion race in , bearings pressed on pinion and carrier , putting the shim pack behind the pinion race at stock .095  .
might get a reading later tonight.
damn life keeps u busy sometines with 2 kids at home and a small business to run.
benn at this a month now  .
1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727
84 j10 ,360, 727
1970 4-door rebel sleeper(455 pontiac,turbo 400)
79 spirit,4.2
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Points: 903 		Post Options Post Options   Thanks (0) Thanks(0)   Quote amc401t10 Quote  Post ReplyReply Direct Link To This Post Posted: Jun/24/2017 at 1:16pm
got the shim right, nice pattern, .065 behind pinin race, stock carier shims worked , got .008 backlash.
 no in lbs torque wrench, got the pinion bearing set to just a little drag when I turn it.
test drive car. I like it!
drive bout 50-60 miles now and a noise (bearing noise) happens under down hill coast
when slowing down. completely stops bout 20 mph or slower.
I'm pretty sure that when the carrier is driving the pinion the pinion bearings are whats under
load.
so questions, pinion bearing too tight , or  loose, ?
if u touch the gas when noise happens , it stops.
the longer u drive and thin the oil , the louder the noise gets
HELP
1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727
84 j10 ,360, 727
1970 4-door rebel sleeper(455 pontiac,turbo 400)
79 spirit,4.2
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Points: 788 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 990V8 Quote  Post ReplyReply Direct Link To This Post Posted: Jun/25/2017 at 2:35pm
So was that a new pinion bearing or the old one?

Ivor
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Points: 1556 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Red20 Quote  Post ReplyReply Direct Link To This Post Posted: Jun/27/2017 at 2:34pm
New crush sleeve?
1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER
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Points: 903 		Post Options Post Options   Thanks (0) Thanks(0)   Quote amc401t10 Quote  Post ReplyReply Direct Link To This Post Posted: Jun/28/2017 at 9:50am
loose pinion yoke nut.
got it back and drove 60-70 miles now.
seems fine.
1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727
84 j10 ,360, 727
1970 4-door rebel sleeper(455 pontiac,turbo 400)
79 spirit,4.2
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Points: 1556 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Red20 Quote  Post ReplyReply Direct Link To This Post Posted: Jun/28/2017 at 3:03pm
Did you use a new crush sleeve or are you using a solid spacer and shims for preload? I recall you said you didn't have an in/lb torque wrench so you got it to what felt like appropriate preload by hand.
1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER
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