Front and rear gear ratio problem - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 20 Old 08-12-2012, 08:12 AM Thread Starter
Cuzzzz
Registered User
 
Cuzzzz's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2012
Location: Martinsville
Posts: 28
Front and rear gear ratio problem

Ok this is kinda weird but I tried out the 4wheel drive yesterday on my 76 cj7 and low range felt ok but 4high caused a binding feeling like the front was geared different than the rear. It was very hard to get out of 4hi. I had to back up to get it out and it pops hard when it does.I am new to jeeps and to this forum and am getting discouraged quickly with ths jeep. Has anyone here had this problem and if so what do I check first and what is a ballpark cost to correct it. I took the sellers word that it worked fine and I hope to never bump into him again. I could not sleep well at night knowing I stuck someone.

Cuzzzz is offline  
Sponsored Links
Advertisement
 
post #2 of 20 Old 08-12-2012, 08:19 AM
papa355
Registered User
1977 CJ7 
 
Join Date: Jan 2011
Location: warsaw
Posts: 914
on the ratios, I would pull the covers off and check, to be sure. that's the only way to know for sure what you have. especially if you just got the jeep.

as far as if it is a transfer problem, I can't help you there.

1977 CJ7, 360 AMC with HEI, TH400 quadratrac, dana30, AMC20, SOA, 35" M/T MTZ
papa355 is offline  
post #3 of 20 Old 08-12-2012, 08:23 AM
82JeepCJ7
Registered User
1982 CJ7 
 
Join Date: Jun 2010
Location: Marysville, WA
Posts: 5,672
Were you driving it on dry pavement? It is normal for the Jeep to kinda buck and jump a bit when driving it on anything other than gravel etc. It is normal to have to back up about 20' to "unbind" the system. Most good ole T-cases (Dana 20, Dana 300) will be a little harder to get out of 4wd. The gears are not synchronized like in a transmission.

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
82JeepCJ7 is offline  
 
post #4 of 20 Old 08-12-2012, 08:28 AM
getbent01
Registered User
1979 CJ7 
 
Join Date: May 2009
Location: Ottumwa IA
Posts: 8
first thing i would do is pull the front and rear diff covers and see what the tooth count is on the ring and pinion is. they are not the same ratio then you will need to make a chiose on what one you want to go with and get a R&P to replace the other. the cost can vary from ratio and modle of diff
getbent01 is offline  
post #5 of 20 Old 08-12-2012, 08:42 AM
82JeepCJ7
Registered User
1982 CJ7 
 
Join Date: Jun 2010
Location: Marysville, WA
Posts: 5,672
The ratios can be a bit different, like 4.10 in the rear and 4.09 or 4.11 in the front an you will still be OK. Because you can drive it in 4low with out snapping off something tells me the ratios are OK.

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
82JeepCJ7 is offline  
post #6 of 20 Old 08-12-2012, 08:43 AM Thread Starter
Cuzzzz
Registered User
 
Cuzzzz's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2012
Location: Martinsville
Posts: 28
It will not even roll hardly in 4hi it just seems to bind up have to give it more gas and yes this is on dry pavement at very low speed. Maybe try on a dirt road but if it snows this year I don't think I could use it because of the binding on dry pavement might throw me off the road. I have had 4x4s in the past but on dry road n a straight line you can't hardly tell a difference. So all jeeps will do this?
Cuzzzz is offline  
post #7 of 20 Old 08-12-2012, 08:58 AM
82JeepCJ7
Registered User
1982 CJ7 
 
Join Date: Jun 2010
Location: Marysville, WA
Posts: 5,672
Jeeps do not have any give in the transfer case like those in a Cherokee, newer TJ's, etc. My best advice... DO NOT drive it on dry pavement in 4wd.

Take it out on a dirt road and test it out. That way when the weather is nasty, if there is any problems, they will be fixed now in the nice weather.

It is normal for a CJ to buck and jump while turning in 4wd on dry pavement, hard packed dirt, etc.

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
82JeepCJ7 is offline  
post #8 of 20 Old 08-12-2012, 09:11 AM Thread Starter
Cuzzzz
Registered User
 
Cuzzzz's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2012
Location: Martinsville
Posts: 28
Ok after the last few replies I went down the street and this may seem wrong but when I pull back into 4low the ratio is lower so I pulled it back further and it goes all the way in 4 low it binds and pops out as well so I guess the ratio is different I must not have had it engaged completely. The front axel has been changed out because this is a 76 with disc brakes. I am going down to see what rear gear I have which is a good road gear so I am guessing around 3:55 or so. Thanks for the advice
Cuzzzz is offline  
post #9 of 20 Old 08-12-2012, 09:21 AM
skizriz
Registered User
 
skizriz's Avatar
1978 CJ7 
 
Join Date: Jun 2011
Location: Scottdale
Posts: 6,124
Quote:
Originally Posted by Cuzzzz View Post
Ok after the last few replies I went down the street and this may seem wrong but when I pull back into 4low the ratio is lower so I pulled it back further and it goes all the way in 4 low it binds and pops out as well so I guess the ratio is different I must not have had it engaged completely. The front axel has been changed out because this is a 76 with disc brakes. I am going down to see what rear gear I have which is a good road gear so I am guessing around 3:55 or so. Thanks for the advice
Take the other's advice they have given you. DO NOT RUN 4WD ON THE DRY PAVEMENT.

Or your next question will be "how do I replace the transfer case?".
skizriz is offline  
post #10 of 20 Old 08-12-2012, 10:07 AM Thread Starter
Cuzzzz
Registered User
 
Cuzzzz's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2012
Location: Martinsville
Posts: 28
Understood on turning on dry pavement but driving in a straight line on dry as well? I have the rear cover off the jeep are there going to be any stamps on the ring gear or do I need to jack it up and count the teeth?
Cuzzzz is offline  
post #11 of 20 Old 08-12-2012, 10:15 AM
skizriz
Registered User
 
skizriz's Avatar
1978 CJ7 
 
Join Date: Jun 2011
Location: Scottdale
Posts: 6,124
Quote:
Originally Posted by Cuzzzz View Post
Understood on turning on dry pavement but driving in a straight line on dry as well?
Yes. Unless your tires are the EXACT same size, they will spin at different speeds.
Eventually something will have to give, on loose dirt, it will be the slippage of the tires. On a high traction surface, it will be the weakest part in your driveline.

To bind up that fast, you may have different gearing. I'd pull the diff covers and see.
Not knowing what the PO did for maintenence, it's a good idea to pull the covers anyhow and change the oil in them. Same with the transmission, transfer case, coolant, brake fluid, engine oil,bearings, brakes, etc.....assume the PO did nothing, and that anything they did do was wrong, and you'll be way better off in the long run.
skizriz is offline  
post #12 of 20 Old 08-12-2012, 10:44 AM Thread Starter
Cuzzzz
Registered User
 
Cuzzzz's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2012
Location: Martinsville
Posts: 28
Ok guys the rear ring gear has 43 teeth and the pinion has 13 now to get the front
Cuzzzz is offline  
post #13 of 20 Old 08-12-2012, 10:53 AM
skizriz
Registered User
 
skizriz's Avatar
1978 CJ7 
 
Join Date: Jun 2011
Location: Scottdale
Posts: 6,124
Quote:
Originally Posted by Cuzzzz View Post
Ok guys the rear ring gear has 43 teeth and the pinion has 13 now to get the front
That's a 3.31.
skizriz is offline  
post #14 of 20 Old 08-12-2012, 11:08 AM
80cj
Web Wheeler
 
80cj's Avatar
1980 CJ5 
 
Join Date: May 2002
Location: Hawaii
Posts: 7,878
Stock ratios on 76's was 3.54 with 4.09 optional. So already you know the rear has been changed. Be interesting to see what the front is....
80cj is offline  
post #15 of 20 Old 08-12-2012, 11:27 AM Thread Starter
Cuzzzz
Registered User
 
Cuzzzz's Avatar
1994 YJ Wrangler 
 
Join Date: Aug 2012
Location: Martinsville
Posts: 28
Well the front was interesting no gear oil and rusty the ring gear has 46 teeth and pinion has 13 with that said and I did this right the front is a 3:54 and the rear is a 3:31 am I right??
Cuzzzz is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user 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 e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
rear end gear ratio question oteps Jeep CJ Forum 1 09-29-2010 07:33 AM
1976 CJ7 rear end gear ratio. PIPER-68 Jeep CJ Forum 7 09-10-2009 08:15 AM
Rear end gear ratio 84cj7 steve84cj7 Jeep CJ Forum 2 02-02-2005 08:58 PM
1.45:1 rear gear ratio? fromme Jeep CJ Forum 3 01-11-2005 03:55 PM
)))))rear gear ratio?((((((((((help! 2cjs Jeep CJ Forum 11 02-25-2002 06:20 PM

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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome