Rear diff questions - Ford F150 Forum - Community of Ford Truck Fans

Go Back   Ford F150 Forum - Community of Ford Truck Fans > Late Model F150s > 2004 - 2008 Ford F150
Log In 

Rear diff questions

Thread Tools Search this Thread
Old 10-09-2010, 04:19 PM   #1
Roxanne- 04 SCrew Lariat
Join Date: Aug 2010
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Default Rear diff questions

I have an H9 rear axle on my new (used) 2004 SCREW Lariat 2WD, confirmed on the pumpkin tag that it is a 9.75. So I know it's a 3.55, with LSD. Guy I bought it fro m did not take the best care of it, though I don't believe it was abused or towed. The other day I was pulling a trailer with about 4K weight total, came to a complete stop with the wheels turned to the right, then turned right when the light turned green. There was some obvious shudder/hop from the right (inside of the turn) wheel as I accellerated, resolve immediately after I was out of the turn.
I've decided to pull the drain plug from the rear diff to see: 1 if there is any metal stuck to it (I assume it's magnetic?) and 2 to check both fluid level and quality.
I've already bought some RP (75-140, I think it said?) to go in, but have a couple of questions...

Is everyone else just using their 3/8 driver extention to open this thing? Mine is an inverted square, 3/8.

What is the electrical line feeding into the top of the pumpkin?

I'm hoping that the original plates just got some friction in 'em after 95K miles of being used very lightly. I've read up on all the diff jobs I can, and think I could tackle everthing except the actual LSD rebuild (don't have that sophisticated a tool set). The Ford Racing LSD's seem to be only 50 or 60 bucks more than the rebuild kit for the one I have, so I'd likely just yank the one in there and replace it. I would prefer to not replace the R+P set unless absolutely necessary.

Looking for any other suggestions/advice. Thanks!
S-WORKS is offline   Reply With Quote
Join F150 Forum

Join Today - It's Totally Free!

Are you a Ford F150 fan? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Ford F150 Fans to meet online.
Once you join you'll be able to post messages, upload pictures of your truck, and have a great time with other Ford F150 fans. Whether your an old timer or just bought your F150 you'll find that is a great community to join. Best of all it's totally free!

Join Today! - Click Here JOIN FOR FREE

Old 10-09-2010, 04:30 PM   #2
Senior Member
5 Year Member
GATORB8's Avatar
Join Date: Dec 2009
Location: Arlington Heights, IL
Posts: 4,976
Thanked 130 Times in 69 Posts

Originally Posted by S-WORKS View Post
What is the electrical line feeding into the top of the pumpkin?
Rear axle speed sensor.
GATORB8 - 2006 Smokestone Scab Lariat 4x4 5.4 - Viper Smartstart|AVS Ventvisors|Tint|Drop In Bedliner|PIAA Back-up Lamps|**** Tow Mirrors|ranchitout shifter cover|Wood Steering Wheel and Dash Kit|WeatherTech Floor Liners|Pioneer Premier TS-D720C|Peerless 10" XXLS|Qlogic Qcustom|Kenwood eXcelon KAC-X4R| wiring|Escort QI45|MBRP Catback|Superchips Flashpaq|K&N Drop In|Optima Red Top|Tekonsha Brake Controller|2.5" AS Level/3" Rear Blocks|275/70R18 BF Goodrich All Terrain
GATORB8 is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Real bad Vibration / Shake in rear end fnbeertime 2004 - 2008 Ford F150 12 09-02-2016 02:10 PM
Intro and part questions LostAndFound General F150 Discussion 26 05-23-2016 09:10 PM
Rough Idle At Operating Temp While In Gear ericarrendale 1997 - 2003 Ford F150 11 09-15-2015 03:56 PM
2015 f150 - good deal? captaingeek Introductions 0 09-06-2015 11:18 PM
Did a Tune Up WOW! LEBScrew13 2009 - 2014 Ford F150 18 09-04-2015 04:56 PM

9.75, axle, diff, lsd, rear end

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 09:31 PM.

Copyright 2006 - 20011
This site is in no way affiliated with the Ford Motor Company.