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Unread 09-24-2003, 10:13 PM   #1
GwenStrough
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Rear Axle end play

While installing new oil seals on the right rear axle of my 1981 CJ7, I noticed a small amount of end play. After taking the axle out, I checked the left rear axle and there is at least a quarter-inch end play. Is there end play on the driver's side because the right side axle is out? How much end play should there be, once all is back together? Is that much end play hard on oil seals? What is actually moving on the axle to cause the end play?

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Unread 09-24-2003, 10:24 PM   #2
only in a jeep cj
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On the Model 20 axle, the bearings are positioned where the race is on the outer side of the bearing set. This makes the axles "push" inward while under a rotating load. Thats why there is a center block over the main shaft in the diff casing. There is then a shim pack on the drivers side that give you the correct endplay.
Sooooo, with one of your axles removed, yes there is a bunch of movement there.
(one piece axles have the bearings like the dana set up and the above does not apply)
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Unread 09-25-2003, 06:53 AM   #3
certifiablejeep
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I am slightly confused by your statement.

Do you need to reinstall the shims with the 1 piece set up or no? i just did the 1 piece install and I didn't seem to need the shims...

I could be wrong though.

cb
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Unread 09-25-2003, 12:23 PM   #4
only in a jeep cj
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Quote:
Originally Posted by cb4158
Do you need to reinstall the shims with the 1 piece set up or no? i just did the 1 piece install and I didn't seem to need the shims...

cb
The info was for the stock 2 piece set up where you need shims on one side to get the correct endplay in both axles (through the diff block)
No shims on the one piece set up. Instead there are spacers used in the tube ends that make the bearing stick out .006 and the backing plate holds it tight. Some even say to remove the diff block in case the aftermarket axles have longer splines and you have trouble installing the second axle to the correct specs.
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1975 CJ-6 304 T15 Dana20 30/44 3.73
1983 CJ-8 258 T5 300 30/44 3.31 Looking for full or half hardtop buy or trade
1986 CJ-7 Laredo 4.6 stroker T5 300 30/44 3.31
1986 TJ-7 Trail Jeep project in the works
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Unread 01-24-2014, 02:32 PM   #5
guscj7
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my 1980cj7 amc 20 rear a lot of play almost 1/4 turn on drive shaft what do u think
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Unread 01-24-2014, 04:06 PM   #6
LumpyGrits
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Quote:
Originally Posted by guscj7 View Post
my 1980cj7 amc 20 rear a lot of play almost 1/4 turn on drive shaft what do u think
That's not axle end-play.
You have issues with either with pinion slop or carrier bearings.
Either way-I would NOT drive it till fixed!
LG
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Unread 01-24-2014, 04:07 PM   #7
LumpyGrits
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Quote:
Originally Posted by GwenStrough View Post
While installing new oil seals on the right rear axle of my 1981 CJ7, I noticed a small amount of end play. After taking the axle out, I checked the left rear axle and there is at least a quarter-inch end play. Is there end play on the driver's side because the right side axle is out? How much end play should there be, once all is back together? Is that much end play hard on oil seals? What is actually moving on the axle to cause the end play?
End play is only measured when BOTH axles are installed.
LG
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Unread 01-24-2014, 07:26 PM   #8
tjeep1
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certifiable i had to use a few of the shims when i put my 1 piece axles in but it depends on your clearence ,mine was binding a little so i shimmed it and it is fine
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Unread 01-24-2014, 09:59 PM   #9
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ummmmm, WOW, holy old thread... I posted that question 11 years ago...

cb
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Unread 01-25-2014, 03:17 PM   #10
guscj7
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i pulled off cover did not no oil was silver pinion gear hitting the carrier still has some beef is this going to be big dollars or should i look for used rear
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Unread 01-25-2014, 03:28 PM   #11
skizriz
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Yes.

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Unread 01-26-2014, 11:03 AM   #12
LumpyGrits
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Quote:
Originally Posted by guscj7 View Post
i pulled off cover did not no oil was silver pinion gear hitting the carrier
Huh??

Have a pro look it over. You may have collapsed the 'crush-sleeve' on the pinion is all.
STOP DRIVING IT TILL FIXED!
ALSO, buy a real FSM and learn how things work.
LG
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