gearing down 0n 35s - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-03-2011, 03:14 PM   #1
Jeeper
 
Stizzle777's Avatar
 
Join Date: May 2011
Location: Columbia,MO
Posts: 37
Images: 25
gearing down 0n 35s

I recently put 35s on my TJ and need to gain the power back. wondering what gears im gonna need???

Stizzle777 is offline   Quote Quick Reply
Old 05-03-2011, 03:16 PM   #2
Jeeper
 
old_blue's Avatar
 
Join Date: Apr 2011
Location: Central Jersey
Posts: 869
at least 4.56 is best

old_blue is offline   Quote Quick Reply
Old 05-03-2011, 03:17 PM   #3
JEEPER

WF Supporting Member
 
KRawson's Avatar
 
Join Date: Jun 2010
Location: Long Beach, Ca
Posts: 915
What motor and transmission do you have?
KRawson is offline   Quote Quick Reply
Old 05-03-2011, 03:20 PM   #4
The Rogue Moderator

::WF Moderator::
 
Cons_Table's Avatar
 
Join Date: Aug 2009
Location: Ridgecrest, CA
Posts: 7,456
We will need more info...like KRawson said, what motor and tranny will make a difference.
__________________
Poor Boy Racing The definition of the EVERYMAN Challenge!

Everyman Challenge XJ Build
Cons_Table is offline   Quote Quick Reply
Old 05-03-2011, 03:28 PM   #5
Jeeper
 
Stizzle777's Avatar
 
Join Date: May 2011
Location: Columbia,MO
Posts: 37
Images: 25
its got a 4.0 auto. Im planning on super 35 kit when the money is right. Im sure ill snap the stock d35 if i dont
Stizzle777 is offline   Quote Quick Reply
Old 05-03-2011, 03:29 PM   #6
Jeeper
 
darkproximity's Avatar
 
Join Date: Feb 2011
Location: Not Spokane, WA
Posts: 12,000
ford 8.8 is cheaper
__________________
Apache chief, e ne chuk!
darkproximity is offline   Quote Quick Reply
Old 05-03-2011, 03:31 PM   #7
Jeeper
 
Stizzle777's Avatar
 
Join Date: May 2011
Location: Columbia,MO
Posts: 37
Images: 25
I just read that actually on another thread. would like to know more
Stizzle777 is offline   Quote Quick Reply
Old 05-03-2011, 03:34 PM   #8
JEEPER

WF Supporting Member
 
KRawson's Avatar
 
Join Date: Jun 2010
Location: Long Beach, Ca
Posts: 915
I say 4.88's, you should beef up your front D30 aswell with atleast chromo shafts. 35's are a pretty big commitment. A lot of money follows those tires.
KRawson is offline   Quote Quick Reply
Old 05-03-2011, 03:34 PM   #9
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 30,871
Images: 2
Quote:
Originally Posted by Stizzle777 View Post
its got a 4.0 auto.
Which automatic? If you have the 3-speed that came on 2002 and older, 4.56 is appropriate for 35" tires. 4.88 would produce excessively high rpms on the highway with 35" tires and the 3-speed auto. I had that combo after converting from the OE 5-speed to the 3-speed auto and my cruising speed was knocked down to 55-60 mph on the highway.

If you have a 2003 or newer which is the 4-speed, 4.88 is the best you can do. That particular transmission, the 4-speed, actually needs 5.13 or 5.38 for 35" tires but your axles can only go to 4.88 which will be "ok" but not quite enough gear with the 4-speed auto.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 05-03-2011, 03:36 PM   #10
Jeeper
 
darkproximity's Avatar
 
Join Date: Feb 2011
Location: Not Spokane, WA
Posts: 12,000
You can go to a junkyard and get one out of a ford explorer, go 1995 and up, so you'll get rear disc brakes, also get one with posi-traction.. when changing diff fluid you'll need to add a special friction modifier for the posi's clutch packs.. Since you have an automatic you can lightly press the brakes and it will work like a fully locked differential.. You'll need to purchase a mount kit for it and weld them on (Kit is like $195) Axle shouldnt cost more than $120..
__________________
Apache chief, e ne chuk!
darkproximity is offline   Quote Quick Reply
Old 05-03-2011, 03:51 PM   #11
The Rogue Moderator

::WF Moderator::
 
Cons_Table's Avatar
 
Join Date: Aug 2009
Location: Ridgecrest, CA
Posts: 7,456
Quote:
Originally Posted by darkproximity View Post
You can go to a junkyard and get one out of a ford explorer, go 1995 and up, so you'll get rear disc brakes, also get one with posi-traction.. when changing diff fluid you'll need to add a special friction modifier for the posi's clutch packs.. Since you have an automatic you can lightly press the brakes and it will work like a fully locked differential.. You'll need to purchase a mount kit for it and weld them on (Kit is like $195) Axle shouldnt cost more than $120..
You dont need a friction modifier...75-140W synthetic gear oil and you are done.
__________________
Poor Boy Racing The definition of the EVERYMAN Challenge!

Everyman Challenge XJ Build
Cons_Table is offline   Quote Quick Reply
Old 05-03-2011, 03:55 PM   #12
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 30,871
Images: 2
Quote:
Originally Posted by Cons_Table View Post
You dont need a friction modifier...75-90W synthetic gear oil and you are done.
You sure about that? I thought the 8.8's LSD was clutch based and would thus need friction modifier to keep the LSD working properly.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 05-03-2011, 03:58 PM   #13
The Rogue Moderator

::WF Moderator::
 
Cons_Table's Avatar
 
Join Date: Aug 2009
Location: Ridgecrest, CA
Posts: 7,456
Quote:
Originally Posted by Jerry Bransford View Post
You sure about that? I thought the 8.8's LSD was clutch based and would thus need friction modifier to keep the LSD working properly.
I would assume so. My 8.8 has the posi...the tag on it specified 75-140W synthetic only. From what I read some people put it in...others didnt, possibly some of the synthetics had FM and others didnt?
__________________
Poor Boy Racing The definition of the EVERYMAN Challenge!

Everyman Challenge XJ Build
Cons_Table is offline   Quote Quick Reply
Old 05-03-2011, 04:11 PM   #14
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 30,871
Images: 2
Synthetic GL-5 gear lubes usually have the friction modifier. At least I've never seen a synthetic GL-5 gear lube that did not.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 05-03-2011, 04:13 PM   #15
The Rogue Moderator

::WF Moderator::
 
Cons_Table's Avatar
 
Join Date: Aug 2009
Location: Ridgecrest, CA
Posts: 7,456
Quote:
Originally Posted by Jerry Bransford View Post
Synthetic GL-5 gear lubes usually have the friction modifier. At least I've never seen a synthetic GL-5 gear lube that did not.
Here we go, I did some research...I put mobil 1, 75-140 synthetic in my rear diff. This did not require the friction modifier...even said that it had the additive on the back or front of the bottle i think.
__________________
Poor Boy Racing The definition of the EVERYMAN Challenge!

Everyman Challenge XJ Build
Cons_Table is offline   Quote Quick Reply
Old 05-03-2011, 04:39 PM   #16
Jeeper
 
Stizzle777's Avatar
 
Join Date: May 2011
Location: Columbia,MO
Posts: 37
Images: 25
So the 8.8 is the way to go. Do we agree??? My cousin owns a salvage yard so finding one wont be a problem. Will my lift bolt up easily to the 8.8 and what gears do i need 4.56 or 4.88
Stizzle777 is offline   Quote Quick Reply
Old 05-03-2011, 04:39 PM   #17
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 30,871
Images: 2
Yes, that's what I was saying. Synthetics normally come with the friction modifier that is required by the 8.8's LSD. If you just add standard 75W-90 GL-5, odds are very good that the friction modifier additive will have to be added separately to keep the LSD's clutch pack happy. The conventional 75W-90 I have out in the garage does not have any friction modifier in it.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 05-03-2011, 04:41 PM   #18
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 30,871
Images: 2
Quote:
Originally Posted by Stizzle777 View Post
So the 8.8 is the way to go. Do we agree??? My cousin owns a salvage yard so finding one wont be a problem. Will my lift bolt up easily to the 8.8 and what gears do i need 4.56 or 4.88
Answer which automatic transmission you have first as was asked several times up above then we'll recommend a ratio and answer your other questions.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 05-03-2011, 04:42 PM   #19
Jeeper
 
Stizzle777's Avatar
 
Join Date: May 2011
Location: Columbia,MO
Posts: 37
Images: 25
its a 97' with 3spd
Stizzle777 is offline   Quote Quick Reply
Old 05-03-2011, 04:48 PM   #20
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 30,871
Images: 2
Yay finally! Ok for 35" tires, you definitely want 4.56 gearing since your auto is the 3-speed that does not have an overdrive.

The 8.8 will need to be modified by removing its leaf spring mounting brackets etc. and having a set of TJ mounting brackets welded in their place. Once that is done, any suspension lift made for the TJ will bolt right on.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 05-03-2011, 04:52 PM   #21
Jeeper
 
darkproximity's Avatar
 
Join Date: Feb 2011
Location: Not Spokane, WA
Posts: 12,000
Depending on what kind of wheeling you do, you might have them weld the tubes too, just for added security..
__________________
Apache chief, e ne chuk!
darkproximity is offline   Quote Quick Reply
Old 05-03-2011, 04:53 PM   #22
Jeeper
 
Stizzle777's Avatar
 
Join Date: May 2011
Location: Columbia,MO
Posts: 37
Images: 25
Sweet. preciate the help guys. One more question, will locker be needed on the posi 8.8.....i want to do some crawling
Stizzle777 is offline   Quote Quick Reply
Old 05-03-2011, 04:55 PM   #23
The Rogue Moderator

::WF Moderator::
 
Cons_Table's Avatar
 
Join Date: Aug 2009
Location: Ridgecrest, CA
Posts: 7,456
Quote:
Originally Posted by Stizzle777 View Post
Sweet. preciate the help guys. One more question, will locker be needed on the posi 8.8.....i want to do some crawling
NEEDED no...preferred, probably

and like proximity said, weld the tubes while you have the welder out.
__________________
Poor Boy Racing The definition of the EVERYMAN Challenge!

Everyman Challenge XJ Build
Cons_Table is offline   Quote Quick Reply
Old 05-03-2011, 04:57 PM   #24
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 30,871
Images: 2
Quote:
Originally Posted by Stizzle777 View Post
Sweet. preciate the help guys. One more question, will locker be needed on the posi 8.8.....i want to do some crawling
If your trails are uneven and tough enough to be lifting tires off the ground, yes it'd be a good idea to replace the 8.8's LSD with a locker.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 05-03-2011, 05:00 PM   #25
Jeeper
 
Stizzle777's Avatar
 
Join Date: May 2011
Location: Columbia,MO
Posts: 37
Images: 25
Im on the phone with the salvage yard and they want to know what ratio i want in the 8.8, they have 4 different ones
Stizzle777 is offline   Quote Quick Reply
Old 05-03-2011, 05:03 PM   #26
Jeeper
 
darkproximity's Avatar
 
Join Date: Feb 2011
Location: Not Spokane, WA
Posts: 12,000
explorers didnt come with 4.56's i dont think.. 4.10 was the highest so i'd go with that.

edit:

just read that there is no carrier break so i'd go with Cons_Table's suggestion below, try and get your ratio as you wont have to replace extra parts later by doing so
__________________
Apache chief, e ne chuk!
darkproximity is offline   Quote Quick Reply
Old 05-03-2011, 05:05 PM   #27
The Rogue Moderator

::WF Moderator::
 
Cons_Table's Avatar
 
Join Date: Aug 2009
Location: Ridgecrest, CA
Posts: 7,456
Do you plan on building it first, installing it, and gearing later? If so, see if they have an axle with your current ratio. If you are gonna build it, lock it, gear it, and then install it, then it doesnt matter what ratio you get.

Make sure to find out what years they have available too...older years are not the desired axles. You want the one with 31 spline shafts and disc brakes.
__________________
Poor Boy Racing The definition of the EVERYMAN Challenge!

Everyman Challenge XJ Build
Cons_Table is offline   Quote Quick Reply
Old 05-03-2011, 06:24 PM   #28
Jeeper
 
Stizzle777's Avatar
 
Join Date: May 2011
Location: Columbia,MO
Posts: 37
Images: 25
If i get one with 4.10 and posi i will leave it like that for a bit
Stizzle777 is offline   Quote Quick Reply
Old 05-03-2011, 06:27 PM   #29
Jeeper
 
darkproximity's Avatar
 
Join Date: Feb 2011
Location: Not Spokane, WA
Posts: 12,000
did you figure out what your axle gears are right now though? they have to match or else you will mess things up..
__________________
Apache chief, e ne chuk!
darkproximity is offline   Quote Quick Reply
Old 05-03-2011, 06:28 PM   #30
The Rogue Moderator

::WF Moderator::
 
Cons_Table's Avatar
 
Join Date: Aug 2009
Location: Ridgecrest, CA
Posts: 7,456
If you get a 4.10 and install it, you will not be able to use 4wd since your gears wont match front and rear. There is nothing wrong with this as long as you dont intend on needing 4wd. This is based on the assumption that your CURRENT gears are not 4.10.

When I did my swap, I got a ford 8.8 with 3.73 gears so that my front and rear matched. This way I was able to use 4wd until I could afford a regear front and rear.

__________________
Poor Boy Racing The definition of the EVERYMAN Challenge!

Everyman Challenge XJ Build
Cons_Table is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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.



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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gearing / Locker Question Hein TJ Tech Forum 8 02-15-2011 04:00 PM
33 tires in a 4 cylinder - what gearing is needed gennaro TJ General Discussion Forum 2 02-05-2011 11:26 PM
NOOB Gearing Questions... pslamp32 TJ General Discussion Forum 7 01-26-2011 09:44 AM
Can someone explain the gearing to me? Dirt Diver YJ Tech Forum 7 02-21-2010 03:49 PM
Gearing Suggestions? Vaultzz YJ General Discussion Forum 24 11-02-2009 02:53 PM


logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid
» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 09:34 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC