gearing queation - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > General Tech
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier Great Lakes 4x4 Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old July 5th, 2014, 11:16 AM   #1
hoyt5885
Senior Member
 
hoyt5885's Avatar
 
Join Date: 01-18-10
Location: St.helen,Michigan
Posts: 1,124
iTrader: (16)
Mentioned: 1 Post(s)
Default gearing queation

I have a 99 tj 4.0 3 speed auto with Dana 30 and 35 axles looking to change gearing looking for 4:56 or 4:88 what is everyone suggesting will be driven on and offroad
hoyt5885 is online now   Reply With Quote
Sponsored Links
Advertisement
 
Old July 5th, 2014, 11:32 AM   #2
HVYRTFT
Reed my teef
 
HVYRTFT's Avatar
 
Join Date: 01-17-07
Location: Whitehall,MI
Posts: 2,447
iTrader: (9)
Mentioned: 1 Post(s)
Default

Tire size is a factor here.
HVYRTFT is offline   Reply With Quote
Old July 5th, 2014, 11:36 AM   #3
whiterhino
I'm not old, honest...
 
whiterhino's Avatar
 
Join Date: 03-07-06
Location: Davisburg MI
Posts: 21,817
iTrader: (21)
Mentioned: 17 Post(s)
Default

Agreed on tire size.
Type of wheeling? Mud, sand, snow, rocks?
Lockers?
Suspension?
How much on road, how much off road?
Daily driver or trail rig that needs to see the occasional street?
__________________
GLFWDA member since 1979.
Member Southern Michigan Rock Crawlers.
whiterhino is offline   Reply With Quote
Old July 5th, 2014, 11:49 AM   #4
hoyt5885
Senior Member
 
hoyt5885's Avatar
 
Join Date: 01-18-10
Location: St.helen,Michigan
Posts: 1,124
iTrader: (16)
Mentioned: 1 Post(s)
Default

35 in tires snow sand and some street driving lockers in both axles
hoyt5885 is online now   Reply With Quote
Old July 5th, 2014, 11:51 AM   #5
Mihlfeldl2005
Life=Short. Jeeps=Cool
 
Mihlfeldl2005's Avatar
 
Join Date: 10-04-11
Location: Fowlerville, MI
Posts: 1,866
iTrader: (9)
Mentioned: 3 Post(s)
Send a message via Yahoo to Mihlfeldl2005 Send a message via Skype™ to Mihlfeldl2005
Default

Say goodbye to those axle shafts! Lol

Sent from my SGH-M919 using Tapatalk
Mihlfeldl2005 is online now   Reply With Quote
Old July 5th, 2014, 11:58 AM   #6
bigbchevy
missmrgreenagain
 
bigbchevy's Avatar
 
Join Date: 09-15-07
Location: fenton /hartland mi
Posts: 19,428
iTrader: (167)
Mentioned: 69 Post(s)
Default

4.88 is what I would run


Sent from my iPhone using Tapatalk
__________________
H.o.r.e
(mr.green)So you are calling CC a liar?? Not a nice way to treat your bitch.
tube bending and gear installs pm me for info! gears installed for $150 and up per axle.
bigbchevy is online now   Reply With Quote
Old July 5th, 2014, 12:05 PM   #7
HVYRTFT
Reed my teef
 
HVYRTFT's Avatar
 
Join Date: 01-17-07
Location: Whitehall,MI
Posts: 2,447
iTrader: (9)
Mentioned: 1 Post(s)
Default

If you avoid serious wheel speed and sudden bursts of traction, those shafts will be ok.
HVYRTFT is offline   Reply With Quote
Old July 5th, 2014, 01:13 PM   #8
whiterhino
I'm not old, honest...
 
whiterhino's Avatar
 
Join Date: 03-07-06
Location: Davisburg MI
Posts: 21,817
iTrader: (21)
Mentioned: 17 Post(s)
Default

Quote:
Originally Posted by bigbchevy View Post
4.88 is what I would run


Sent from my iPhone using Tapatalk
Quote:
Originally Posted by HVYRTFT View Post
If you avoid serious wheel speed and sudden bursts of traction, those shafts will be ok.
I agree with both of these statements.
__________________
GLFWDA member since 1979.
Member Southern Michigan Rock Crawlers.
whiterhino is offline   Reply With Quote
Old July 5th, 2014, 03:07 PM   #9
Mihlfeldl2005
Life=Short. Jeeps=Cool
 
Mihlfeldl2005's Avatar
 
Join Date: 10-04-11
Location: Fowlerville, MI
Posts: 1,866
iTrader: (9)
Mentioned: 3 Post(s)
Send a message via Yahoo to Mihlfeldl2005 Send a message via Skype™ to Mihlfeldl2005
Default

Should get Scott to do the gear swap to!

Sent from my SGH-M919 using Tapatalk
Mihlfeldl2005 is online now   Reply With Quote
Old July 5th, 2014, 05:33 PM   #10
cerial
Senior Member
 
cerial's Avatar
 
Join Date: 09-06-08
Location: Caledonia,MI
Posts: 1,756
iTrader: (3)
Mentioned: 1 Post(s)
Default

With that pos 999 your not going down the highway anyway with those gears. Get lower gearing using the transfer case. Do a 4 speed swap like thousands have done before when you have everything around to punch it out in a weekend. Then it will be somewhat streetable.

Otherwise plan on replacing the top end of that engine or the engine itself soon after you do a swap.

Been there done that.
cerial is offline   Reply With Quote
Old July 6th, 2014, 06:34 PM   #11
joe_jeep
welfare wheeler
 
joe_jeep's Avatar
 
Join Date: 03-03-06
Location: hazel park, mi
Posts: 5,793
iTrader: (37)
Mentioned: 2 Post(s)
Send a message via Yahoo to joe_jeep
Default

4.10 or 4.56 with a 3spd auto if u see highway use.
4.88 if you see little street use.
joe_jeep is offline   Reply With Quote
Old July 11th, 2014, 05:35 PM   #12
cerial
Senior Member
 
cerial's Avatar
 
Join Date: 09-06-08
Location: Caledonia,MI
Posts: 1,756
iTrader: (3)
Mentioned: 1 Post(s)
Default

Your current transmission is a 999 and current axle ratio is 3.73. Your engine is screaming a bit over 3,000 at 75mph.

Your current transmission ratios are
2.74
1.45
1.00
An aw-4 ratios are
2.804
1.531
1.00
0.753

If I take your ratio and plug in a aw4's overdrive ratio you end up being able to run a 4.95/1ish rear axle ratio without effecting your engine rpm at highway speed. You will obviously get better acceleration and a small amount of off road performance.

If you are happy with the "street" performance that you currently have you can leave the axle ratio alone and simply increase the low ratio in the transfer case. You will get a very respectable increase in power offroad over what you will by simply switching out the axle ratios for about the same or less cash.

Lets do some math.
With your stock 3.73 axle ratio, 3 speed, and a 4/1 low you get a 1.28/1 increase.
With a 4.88 axle ratio and 3 speed you are going to get a 1.15/1 over stock.
With a 4.88 axle ratio and 4 speed you are going to get 1.21/1 increase
With a 4.88 axle ratio, 4 speed, and a 4/1 low added at a later time you get a 2.49/1 ratio increase without affecting your highway rpm.
cerial is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > General Tech

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

Forum Jump


All times are GMT -5. The time now is 08:02 AM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Page generated in 0.18938 seconds with 57 queries