Rear End Help
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Joined: Oct 2007
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Rear End Help
I am considering buying new gears and a locker for the rear differential on my truck. it is a 91 F-150 with the 300 I6 alls i know is that now at 70mph it is turning 2050 rpms (so i think it has 3.08's gearing now) and it is an open rear end. I know its eigther the 8.8 or the 9 but not positive. any advice is apreciated thanks
JB
JB
Carpenter Local 745
Joined: Apr 2006
Posts: 5,794
Likes: 11
From: on da beach
It is completely different from the 9 in. rear ends.
Either the whole truck goes to the shop or the whole rear end does.
The 8.8 is not a third member like the 9 in.
Take it in if it is a daily driver, a driveway swap may take time without the proper tools (but it has been done).
Either the whole truck goes to the shop or the whole rear end does.
The 8.8 is not a third member like the 9 in.
Take it in if it is a daily driver, a driveway swap may take time without the proper tools (but it has been done).
Postmaster
Joined: Oct 2006
Posts: 4,816
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From: Davis & Newcastle, CA
If it's a 4x4 then make sure you also change the front gears to match.
And I agree with Paul here, 70mph at 2050rpms sounds like 3.55s or even 3.73s, but the latter is pretty uncommon on a stock setup.
And I agree with Paul here, 70mph at 2050rpms sounds like 3.55s or even 3.73s, but the latter is pretty uncommon on a stock setup.
Senior User
Joined: Dec 2007
Posts: 348
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From: Lutz, FL
Shouldn't swapping the gears be basically replacing the ring and pinion gears? I've been researching this because I'm planning on going from 3.73's to 4.10's on my truck since I have 35" tires on it, and it is constantly kicking out of O/D on the highway when going overpasses. I know tearing apart the entire rearend is deep but all we have to really replace it the the gears, right?
Rick
93 F150 4x4 AOD 3.73ls 8.8 & Dana 44
Rick
93 F150 4x4 AOD 3.73ls 8.8 & Dana 44
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Postmaster
Joined: Oct 2006
Posts: 4,816
Likes: 1
From: Davis & Newcastle, CA
Originally Posted by pc_2000
Shouldn't swapping the gears be basically replacing the ring and pinion gears? I've been researching this because I'm planning on going from 3.73's to 4.10's on my truck since I have 35" tires on it, and it is constantly kicking out of O/D on the highway when going overpasses. I know tearing apart the entire rearend is deep but all we have to really replace it the the gears, right?
Rick
93 F150 4x4 AOD 3.73ls 8.8 & Dana 44
Rick
93 F150 4x4 AOD 3.73ls 8.8 & Dana 44
I also think that you're misunderstanding just how involved the job is. In order to replace the ring and pinion the entire differentials must be torn apart. Then once you get the new parts in, you need to shim the pinion and align everything correctly so your gears to hum and whine -- which will lead to severe damage. If you don't have experience in the field then I suggest paying someone to do it.
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Senior User
Joined: Dec 2007
Posts: 348
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From: Lutz, FL
Chris,
Thanks for the tip on the involvement. No I have never done it, but is a first time for everything. Besides, as I searched this site, I saw a pic of an invoice someone else had posted and the labor cost of $700+ floored me. I'm a very hands-on person and do 99% of my own work, so I'll take the challenge.
I'll let everyone know how it goes. This will be after the government reimburses me for using my money all year.
I just looked through Summit Racing for the carrier and I'm not sure what I need here. Does this look like what I need?
http://store.summitracing.com/partde...5&autoview=sku
Thanks in advance
Rick
93 F150 4x4 5.0SD AOD
Thanks for the tip on the involvement. No I have never done it, but is a first time for everything. Besides, as I searched this site, I saw a pic of an invoice someone else had posted and the labor cost of $700+ floored me. I'm a very hands-on person and do 99% of my own work, so I'll take the challenge.
I'll let everyone know how it goes. This will be after the government reimburses me for using my money all year.
I just looked through Summit Racing for the carrier and I'm not sure what I need here. Does this look like what I need?
http://store.summitracing.com/partde...5&autoview=sku
Thanks in advance
Rick
93 F150 4x4 5.0SD AOD
Last edited by pc_2000; Jan 14, 2008 at 06:50 AM.
Postmaster
Joined: Oct 2006
Posts: 4,816
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From: Davis & Newcastle, CA
That invoice you saw was mine 
http://i170.-----------.com/albums/u...p/DSC00802.jpg
And yeah that carrier looks like it will work but it doesn't specifically say that it's high pinion/reverse rotation, which is what you specifically need for your truck. I recommend shopping on a site like Broncograveyard.com or Ringpinion.com, they have exactly what you need in a variety of brands and styles. Also, be sure to buy rebuild kits for both differentials, which includes bearings, seals, shims, etc etc. Trust me you'll want to replace all those things while you've got it torn apart. They can also be had at the afformentioned websites.
http://i170.-----------.com/albums/u...p/DSC00802.jpg
And yeah that carrier looks like it will work but it doesn't specifically say that it's high pinion/reverse rotation, which is what you specifically need for your truck. I recommend shopping on a site like Broncograveyard.com or Ringpinion.com, they have exactly what you need in a variety of brands and styles. Also, be sure to buy rebuild kits for both differentials, which includes bearings, seals, shims, etc etc. Trust me you'll want to replace all those things while you've got it torn apart. They can also be had at the afformentioned websites.
Senior User
Joined: Dec 2007
Posts: 348
Likes: 1
From: Lutz, FL
Originally Posted by khadma
Tack on another 800-900 for it where I live.
Front and rear R&P plus rear detroit locker and front true trac = 2600.00
Front and rear R&P plus rear detroit locker and front true trac = 2600.00
Holy *%@$ !! I'm definitely going to try it myself first. LOL
Chris,
I looked through Summit more (they are cheaper than Jegs, I haven't checked those sites you mentioned yet) and under the applications section, as I drilled down specifically to the F150 front that's the part they mention. So I'm guessing that should be correct. I'll check those sites you mentioned and see what they say. Thanks
Rick
93 F150 4x4 5.0SD AOD
Fleet Mechanic
Joined: Nov 2004
Posts: 1,324
Likes: 4
From: Michigan
Check this link out. It will give you an idea as to what you are getting into.
http://www.angelfire.com/theforce/5o...5ohtech001.htm
There is also an instructional video out here on the web. Check ebay or do a search. I hear it's a must for the first timers.
http://www.angelfire.com/theforce/5o...5ohtech001.htm
There is also an instructional video out here on the web. Check ebay or do a search. I hear it's a must for the first timers.
Senior User
Joined: Dec 2007
Posts: 348
Likes: 1
From: Lutz, FL
Originally Posted by alz
Check this link out. It will give you an idea as to what you are getting into.
http://www.angelfire.com/theforce/5ohcpa/cpa5ohtech001.htm
There is also an instructional video out here on the web. Check ebay or do a search. I hear it's a must for the first timers.
http://www.angelfire.com/theforce/5ohcpa/cpa5ohtech001.htm
There is also an instructional video out here on the web. Check ebay or do a search. I hear it's a must for the first timers.
Fleet Mechanic
Joined: Nov 2004
Posts: 1,324
Likes: 4
From: Michigan
Here is a video. It covers them all.
http://www.technicalvideos.com/video...erential.phtml
I've never personally done this work. I only found the link for you. I have used the other site to rebuild my Trac-Loc though.
http://www.technicalvideos.com/video...erential.phtml
I've never personally done this work. I only found the link for you. I have used the other site to rebuild my Trac-Loc though.