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Formula for regearing?


 
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TMG
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Joined: 17 Mar 2007
Location: huntington beach,ca.

PostPosted: Wed Jun 04, 2008 5:53 am    Post subject: Formula for regearing? Reply with quote

I finally lifted my yeep (RE 4.5 superflex w/33" goodyear MTR) I Have 3.73 gears stock in D30 front D35 rear. My question is how do I figure out what gear ratio to change to? I'm trying to get it back to stock feeling because it is a daily driver and even when I go wheelin I have to drive on the freeway for a while. Thanks for any input
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majikxms
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Joined: 18 Feb 2004

PostPosted: Wed Jun 04, 2008 2:13 pm    Post subject: Reply with quote

This will help:

http://jeephorizons.com/tech/rpmchart.html
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ehirner
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Joined: 01 Jan 2004
Location: Eastern PA

PostPosted: Thu Jun 05, 2008 6:13 am    Post subject: Reply with quote

Google "gear calculator" and have fun playing with numbers. Put in your stock setup first, to see where your RPMs were. Then play around.
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hutchman
Captain Kirk
Captain Kirk


Joined: 07 Feb 2007
Location: Kennewick, WA

PostPosted: Thu Jun 05, 2008 8:00 am    Post subject: Reply with quote

Don't forget that the chart is assuming you have the transmission in direct, i.e. 1:1. If you are looking at rpm with the transmission in overdrive, you have to multiply the chart rpm by the OD ratio.

For example if you look at 4.88s with 33 inch tires, the indicated rpm is 2733. If you have a transmssion with a .76 OD, the actual rpm you would expect to see is:

2733 X .76 = 2077 at 55 mph.
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TMG
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Joined: 17 Mar 2007
Location: huntington beach,ca.

PostPosted: Fri Jun 06, 2008 5:19 am    Post subject: Reply with quote

Thanks for the replies. I do have the automatic trans with O.D. so thank you for that tid bit, it didn't occur to me at the time I was looking at the chart.
I just have to go for a cruise and check the RPM in O.D. and out. Thanks again for the replies..
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FARMER
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Joined: 29 May 2007
Location: Benicia Ca.

PostPosted: Mon Jun 09, 2008 4:00 pm    Post subject: Reply with quote

With the 5 speed manual, 4th is usually a 1 to 1 ratio and the auto with O.D., 3rd is usually a 1 to 1 ratio
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mpetess10
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Joined: 03 Apr 2006

PostPosted: Sat Jun 20, 2009 10:54 am    Post subject: Reply with quote

JUST A DUMB QUESTION BUT
how much do you wheel this thing and what terrain do you wheel it in. reason I ask is you are running a D35 rear per your original post. unless its a mall crawler a D35 on a 33" tire is asking problems even if its OPEN. regearing to 4.88 is going to make the ring gear so think its even more susceptable to breakage. I would suggest looking into a rear axle swap of some sort. if you could deal with 4.10 gears an explorer 8.8 swap would be ideal. around here at the local pull a part junkyards you can grab a complete 8.8 with disc brakes for 130 bux with calipers and rotors on it. 95+ explorers have this rear in it and it is very common to find them equipped with limited slips and 4.10 gears
a couple hundred bux for a TJ axle bracket kit and paying a shop to weld it all up for ya is probably another couple hundred bux. you will spend about the same amount on an 8.8 swap as you will to regear your D35 and your still running a ticking time bomb.
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ZJDAB
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Joined: 28 Aug 2008
Location: MD

PostPosted: Tue Jun 23, 2009 6:38 am    Post subject: Reply with quote

^^^^^^^^^^^^^
AGREEEEEEEEEE



google.

Explorer Grand Cherokee swap.

D35/ my bearings and my brothers d35 both went out.

when we had stock tires....
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Welfare recipients should pass a drug test to get paid…"-TJ Apex
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