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-   -   Front and rear gear ratio problem (https://www.jeepforum.com/forum/f8/front-rear-gear-ratio-problem-1404369/)

Cuzzzz 08-12-2012 08:12 AM

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.

papa355 08-12-2012 08:19 AM

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.

82JeepCJ7 08-12-2012 08:23 AM

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.

getbent01 08-12-2012 08:28 AM

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

82JeepCJ7 08-12-2012 08:42 AM

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.

Cuzzzz 08-12-2012 08:43 AM

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?

82JeepCJ7 08-12-2012 08:58 AM

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.

Cuzzzz 08-12-2012 09:11 AM

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

skizriz 08-12-2012 09:21 AM

Quote:

Originally Posted by Cuzzzz (Post 14008785)
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?".:(

Cuzzzz 08-12-2012 10:07 AM

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?

skizriz 08-12-2012 10:15 AM

Quote:

Originally Posted by Cuzzzz (Post 14009039)
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.:thumbsup: 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.

Cuzzzz 08-12-2012 10:44 AM

Ok guys the rear ring gear has 43 teeth and the pinion has 13 now to get the front

skizriz 08-12-2012 10:53 AM

Quote:

Originally Posted by Cuzzzz (Post 14009160)
Ok guys the rear ring gear has 43 teeth and the pinion has 13 now to get the front

That's a 3.31.

80cj 08-12-2012 11:08 AM

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....

Cuzzzz 08-12-2012 11:27 AM

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??


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