9'' gear swap from 4.33 to 3.50 or 3.25 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 11-14-2011, 12:41 PM
Mach1460's Avatar
Registered User
 

Last journal entry: Project 92' Eddie
Last photo:
Join Date: Jun 2011
Location: South Dakota
Posts: 203
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
9'' gear swap from 4.33 to 3.50 or 3.25

Gear guru's---

I built the 9'' in my mach 1 a year ago and I had a free set of brand new 4.33 gears from my brother-- knowing they were very low being im running a 532 BBF with a C6 i installed them anyway (they were free so what the heck)

Well after driving for a year and absolutely loving the accelleration side of things but hating the big block spinning 3500 rpm at 50mph. This is a street car and I need it a little more tame. Well after looking at different gear ratios I have decided to go with either a 3.50 or a 3.25

I have a detroit tru-track locker which will swap over but heres my question:
to swap my gears do i need anything other than a new crush sleeve???
obviously ill change oil while im in there but since all the bearings are new, I should be good just swap the gears and recheck my clearances/set up pattern. When I put the 4.33s in was my first time building a rear axle but has held up for just over a year with 600+HP in front of it so I must have done something right Thanks!

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-15-2011, 10:31 AM
S10xGN's Avatar
Gotta love a turbo!
 

Last journal entry: Body on Frame today.
Last photo:
Join Date: Aug 2004
Location: Port Neches, TX
Age: 61
Posts: 1,711
Wiki Edits: 0

Thanks: 0
Thanked 66 Times in 62 Posts
I'd upgrade from the crush sleeve to a solid spacer and shims...

Russ
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-15-2011, 11:39 AM
prostreet6t9's Avatar
Differential/Driveline
 
Last photo:
Join Date: Sep 2008
Location: oregon
Age: 51
Posts: 1,760
Wiki Edits: 0

Thanks: 9
Thanked 43 Times in 40 Posts
Pinion seal: 7044NA

Inner pinion Brg. M88048. For Daytona support:HM89443
Inner race: M88010. For Daytona support: HM89410
Crush sleeve: 3104
Solid Spacer: 4105

If it were me.. I'd change the inner p/brg, pinion seal and crush sleeve or spacer.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-20-2011, 07:55 PM
bentwings's Avatar
bentwings
 
Last photo:
Join Date: May 2002
Location: St.Paul, Minn
Age: 72
Posts: 1,798
Wiki Edits: 0

Thanks: 0
Thanked 16 Times in 15 Posts
I'd also use the spacer instead of the crush sleeve.

You probably won't be able to get the rear pinion bearing off the pinion so plan on a new one with the race.

Assuming your pattern was good you should be able to compare the setting numbers on the pinions and adjust the big shims behind the pinion support for the first test.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-21-2011, 06:19 AM
Irelands child's Avatar
Registered User
 
Last wiki edit: Ford engine specifications Last photo:
Join Date: Jan 2005
Location: Upstate New York
Posts: 4,958
Wiki Edits: 8

Thanks: 18
Thanked 232 Times in 209 Posts
The other guys have the right parts.

Now - ratio. The 3.25's might not be much 'fun' if you have fairly tall tires. I made that mistake when I went to 3.25's from 3.70's, changed from a 26" diameter tire on a 15" wheel to an almost 30" on a 17" wheel in one big change. While my gas mileage is great, it is kind of a dog to about 30mph - and ~2000 at 60mph. I need to get anther long 1310 yoke to go back to the 3.70's and hope to over the winter, but is at the bottom of the update list right now.

Dave W
__________________
Irelands child
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
GM 8.2 gear swap oldguy829 Transmission - Rearend 1 05-19-2011 01:40 PM
Gear swap 2.42 to 3.55 UngerMarkus Transmission - Rearend 8 09-25-2010 10:03 AM
456 gear swap to 373 in 8.5 rearend, carrier swap? leslie61 Transmission - Rearend 3 07-19-2009 04:45 PM
gear swap red_rider52 Transmission - Rearend 4 01-16-2005 07:50 PM
Gear Swap. M&M CUSTOM Transmission - Rearend 3 06-26-2004 06:53 AM


All times are GMT -6. The time now is 09:04 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.