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Unread 05-31-2008, 02:58 PM   #1
chuck138
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1986 CJ7 
 
Join Date: May 2008
Location: Philadelphia, Pa.
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More Highway Worthy Less Off Road

In the process of restoring a 1986 CJ 7. I'm interested in making it more of a highway vehicle and very little if any off road excursions. Is it the gearing? It screams when going 55 mph! Any suggestions?

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Unread 05-31-2008, 03:13 PM   #2
supraman1990
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1980 CJ5 
 
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Probably gearing. What transmission do you have?
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Unread 05-31-2008, 03:15 PM   #3
chuck138
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1986 CJ7 
 
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I have a T 5 Transmission
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Unread 05-31-2008, 03:19 PM   #4
Mike Romain
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1986 CJ7 
 
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Location: Off the Grid in Chester Grant, Nova Scotia, Canada
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Most 86's came with tall gears, 3.31's.

That puts me at 2300 rpm at 65 mph with 33" tires. 1750 in 5th.

You can check your ratio by jacking up one tire in an open diff and making a chalk mark on the tire and on the driveshaft, then turning the tire twice while counting the driveshaft turns. Mine does 3 and a third turns.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 05-31-2008, 03:23 PM   #5
chuck138
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1986 CJ7 
 
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I have 31" tires and it is an effort for it to get to 60 mph. I had an 86 CJ 7 in 1986 and I do not remember it being like this one.
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Unread 05-31-2008, 03:29 PM   #6
Mike Romain
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Quote:
Originally Posted by chuck138 View Post
I have 31" tires and it is an effort for it to get to 60 mph. I had an 86 CJ 7 in 1986 and I do not remember it being like this one.
Something wrong there, mine hauls up to 75 mph in 3rd and 4th will bury the speedo. I have no urge to find out how fast 5th will go...

Do you have a tach? Maybe the clutch is slipping or maybe someone had monster tires on it and re-geared?
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 05-31-2008, 03:31 PM   #7
chuck138
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1986 CJ7 
 
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When I bought it it had 33 x 14.5 huge mud tires on it. I have it in the paint shop and once it is finished I will have the mechanic check the gearing. The kid used it in the pine barrens of New Jersey.
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Unread 05-31-2008, 03:33 PM   #8
chuck138
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Also, I have not really checked out the tach at 55 mph. I have had it various shops for restoration that I have not really driven it much if at all.
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Unread 05-31-2008, 03:34 PM   #9
jayhawkclint
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Quote:
Originally Posted by chuck138 View Post
It screams when going 55 mph! Any suggestions?
Could be as simple as putting the t-case in hi-range. Seriously, if the Jeep is somewhat stock, I'd be willing to bet you don't have the shifter in the right position.

4l
N
2h
4h

Engine RPM calculator showing around ~4100 RPM in high range at 55mph with 3.31 and 31" tires:
http://www.csgnetwork.com/multirpmcalc.html
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Last edited by jayhawkclint; 05-31-2008 at 03:49 PM..
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Unread 05-31-2008, 03:39 PM   #10
chuck138
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Other than putting fuel in it and possibly putting air in the tires, that is about all my auto knowledge. I should be getting it from the paint shop in about 2 weeks. I will check on where the shift is positioned. Thanks
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Unread 05-31-2008, 03:50 PM   #11
jayhawkclint
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Quote:
Originally Posted by chuck138 View Post
Other than putting fuel in it and possibly putting air in the tires, that is about all my auto knowledge.
I don't mean any offense by this whatsoever, but are you sure a CJ is for you? They can turn money pit real quick if you have to pay others to fix them.
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Unread 05-31-2008, 03:56 PM   #12
SuB8HaVeN
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Hell, they will even turn into money pits if you fix it yourself...
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Unread 05-31-2008, 03:56 PM   #13
chuck138
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No offense taken. I'm reliving my past, I might not have auto knowledge but I do have the disposable funds to get this to where I want it.
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Unread 05-31-2008, 04:11 PM   #14
ajeepman
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Quote:
Originally Posted by chuck138 View Post
No offense taken. I'm reliving my past, I might not have auto knowledge but I do have the disposable funds to get this to where I want it.
I got an idea...how bout we use our knowledge to get all our cj's where we want them and your disposable funds to finance the project and we call it a jeep forum . com team building? We can do this as an annual event even....
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Unread 05-31-2008, 04:14 PM   #15
chuck138
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LOL I'm afraid my ex-wife and 2 teenage children have taken that slot already!
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