rear end Q's
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Joined: Jun 2007
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rear end Q's
hello all
i just picked up a 1994 f150 4x4 with a 4.9 and 5spd. the rear end is very noisy. i would like to know what years would fit my truck? and is the 2wd the same? the tag is missing off the rear end so i don't know the gear? i was told its got 308s or 355s? i can pick up a rear end off a friend but its not out of a 1994. i think its 1989?
thanks for any help.
i just picked up a 1994 f150 4x4 with a 4.9 and 5spd. the rear end is very noisy. i would like to know what years would fit my truck? and is the 2wd the same? the tag is missing off the rear end so i don't know the gear? i was told its got 308s or 355s? i can pick up a rear end off a friend but its not out of a 1994. i think its 1989?
thanks for any help.
Elder User
Joined: Feb 2007
Posts: 707
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From: Mulege south Baja ca. Mx.
89 is to early you need to get one that has a tone ring for the speedo. you probably have3.55 with 4X4 but you will need to jack up a wheel and check to see what you have by turning the wheel and counting the drive shaft reves.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
Originally Posted by hamels4x4
i just picked up a 1994 f150 4x4 with a 4.9 and 5spd. the rear end is very noisy.
It is a lot cheaper to fix the noise than to replace the rear end with another one that may be bad soon.
If it is the wheel bearing just replace the bearings, if the noise is from the center and you have oil in it then just tighten the nut to specifications and see if the noise does not go away. Use an inch lb torque wrench and set the nut to 8-14 Lb-In. You will need a 3/4 drive socket with about a 4 ft pipe to turn the nut and just turn it a little at a time (about an 1/8 turn) and then check it.
Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
Yes, I would try to fix the one you have.
To answer your question on the swap, any 8.8" axle from an F-150 from 1987 to 1996 will have the tone ring you need. They will all be a direct swap in. The front also has a tag - did you check it? The rear should be close.
Front: Rear:
3.07 3.08
3.54 3.55
4.09 4.10
To answer your question on the swap, any 8.8" axle from an F-150 from 1987 to 1996 will have the tone ring you need. They will all be a direct swap in. The front also has a tag - did you check it? The rear should be close.
Front: Rear:
3.07 3.08
3.54 3.55
4.09 4.10
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Originally Posted by hamels4x4
hello all
i just picked up a 1994 f150 4x4 with a 4.9 and 5spd. the rear end is very noisy. i would like to know what years would fit my truck? and is the 2wd the same? the tag is missing off the rear end so i don't know the gear? i was told its got 308s or 355s? i can pick up a rear end off a friend but its not out of a 1994. i think its 1989?
thanks for any help.
i just picked up a 1994 f150 4x4 with a 4.9 and 5spd. the rear end is very noisy. i would like to know what years would fit my truck? and is the 2wd the same? the tag is missing off the rear end so i don't know the gear? i was told its got 308s or 355s? i can pick up a rear end off a friend but its not out of a 1994. i think its 1989?
thanks for any help.
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Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Originally Posted by hamels4x4
thanks for the help. i will check the fluid level. and the front tag. the noise is comming from the center of the rear end. it humms and grinds when i let off the gas?
Tightening the nut, I made my holder out of 1/4" plate 3 FT long with a torch and drilled for the bolts:
Checking the preload, take the Brake Drums off first:
Last edited by subford; Jun 7, 2007 at 06:21 AM.
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Senior User
Joined: Dec 2005
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From: Bryan, OH
What kind of noise is it? Is it a grinding clunking noise? Or a grinding whirling noise? (trying to find out if it's coming from the center of the axle or the outside ends) If you take the inspection plate off, you can always count the number of teeth on the ring and pinion. As example: 39 (ring) 11 (pinion) 39 divided by 11 = 3.55. I had to replace my center section for about $400. The rear will end up costing you easly twice that. Plus you have to bleed your brakes and then some.
Elder User
Joined: May 2007
Posts: 754
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From: Solon, Ohio
Subford, why do you need a 3/4" drive socket and a 4 foot bar to tighten only to 8-14 Ft pounds ??
And in your preload test, is that to test the amount of inch torque before the unloaded axel will spin. And what is that spec ??
And in your preload test, is that to test the amount of inch torque before the unloaded axel will spin. And what is that spec ??
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by netscaner
Subford, why do you need a 3/4" drive socket and a 4 foot bar to tighten only to 8-14 Ft pounds ??
And in your preload test, is that to test the amount of inch torque before the unloaded axel will spin. And what is that spec ??
And in your preload test, is that to test the amount of inch torque before the unloaded axel will spin. And what is that spec ??
It is 8-14 Inch pounds not FT pounds.
And yes the 8-14 Inch pounds is the required torque to turn (spin) the unloaded axle with used bearings. Never back up a nut to set the torque.
And use a new NUT, crimp the nut or put lock-tite on it.
Last edited by subford; Jun 7, 2007 at 09:56 AM.
Elder User
Joined: May 2007
Posts: 754
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From: Solon, Ohio
WOW, I was just turning my axels back and forth to make sure the oil seals are seated smoothly before filling the rear end and I noticed that the pinion flange where the driveshaft attaches moves in and out looks like at least 1/16th of an inch. It wasn't leaking.
Is this normal ??
Does tightening the pinion nut remedy this ??
Is this normal ??
Does tightening the pinion nut remedy this ??
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Originally Posted by netscaner
WOW, I was just turning my axels back and forth to make sure the oil seals are seated smoothly before filling the rear end and I noticed that the pinion flange where the driveshaft attaches moves in and out looks like at least 1/16th of an inch. It wasn't leaking.
Is this normal ??
Is this normal ??
Originally Posted by netscaner
Does tightening the pinion nut remedy this ??