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Unread 10-06-2014, 02:18 PM   #1
Ismellbacon
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Gearing

Hoping you folks can help me. I have a 1980 cj5 with the 304. I just put in a new clutch,bellhousing, flywheel,and a new rebuilt T-176 4 speed and dana 30 t case. I currently am running 35x12.50 tires. I am assuming that the gearing is stock. I was test driving it and in 4th gear it was spinning 3500 rpm's at 45-50 mph. I am looking for the ring and pinion gearing that would be the best all around for street and some trails.

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Unread 10-06-2014, 02:47 PM   #2
coxhaus
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I used a gear ratio calculator to figure out your gear ratio. I used the following parameters, speed 50, rpm 3500, and tires size 35. I came up with 7:1 which does not sound right to me.
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CJ7 79 258 Clifford Stage II, intake, headers, cam, and head. Weber 38x38 w Cagle, Rancho 2 1/2 body Mallory dist and MSD, dual batteries Ramsey winch T18 Dana 20 with Teraflex gears AMC 20 ARB disc Dana 30 Lockright Aero 26 gal tank Tomken Machine bumpers and swing out spare tire. 33" procomp Xterrain tires.
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Unread 10-06-2014, 02:51 PM   #3
ADDZ71
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If the calculator says 7:1 then maybe it is in low range? 3.54 rear end with 2:1 xfer case is nearly the same. Probably pretty good from a start say no more than 10 mph before the engine is screaming. In my Jeep anything over 3,000 rpm is screaming considering I have headers and sidepipes.
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Unread 10-06-2014, 02:55 PM   #4
coxhaus
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The Dana 300 is a 2.72 ratio low end ratio transfer case.


I would make sure you are in 2WD with your transfer case.
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CJ7 79 258 Clifford Stage II, intake, headers, cam, and head. Weber 38x38 w Cagle, Rancho 2 1/2 body Mallory dist and MSD, dual batteries Ramsey winch T18 Dana 20 with Teraflex gears AMC 20 ARB disc Dana 30 Lockright Aero 26 gal tank Tomken Machine bumpers and swing out spare tire. 33" procomp Xterrain tires.
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Unread 10-06-2014, 02:59 PM   #5
jeepwhore
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2.72 Dana 300 low range with 2.73 diff gears would give you pretty much that exact scenario.....51 mph @ 3500 rpm.
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Unread 10-07-2014, 12:11 AM   #6
Ismellbacon
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So can anyone make a recomendation on gearing to correct this and make it so my motor will not blow up at 65 mph?
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Unread 10-07-2014, 12:15 AM   #7
I6CJ7
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Did you make certain your 4wd (transfecase shifter) is not in low range? Sounds like that's the problem.
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Unread 10-07-2014, 06:12 AM   #8
Mike Romain
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Quote:
Originally Posted by Ismellbacon View Post
So can anyone make a recomendation on gearing to correct this and make it so my motor will not blow up at 65 mph?
Yup, shift the transfer case to 2 WD high range seems to be the consensus. Your rpm and tire size imply you are in low range in the T-case.
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Unread 10-07-2014, 06:23 AM   #9
gmakra
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With the V-8 you could use 4.11 gears and pretty much be close to stock it would be around 2500 RPM at 65 mph 4;56 would be 2850 RPM at 65 mph.
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Unread 10-08-2014, 06:52 PM   #10
Ismellbacon
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It is in 2 Wd high, I am going to have the axels rebuilt and go with the moser kit for solid rear axel that will be the time I switch out to 4:11 difs. Any chance any one has a photo of the cut a way seat mod for us big folk trying to squeeze into a CJ 5 it sounds like the cut into and fab the driver side rear wheel. You guys are s great help thank you.pk
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Unread 10-08-2014, 07:21 PM   #11
I6CJ7
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I suppose its possible someone such 5.38's in the axles, dunno off the top of my head what the rpm would be, but that would certainly limit you to 55mph or less.
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Unread 10-08-2014, 07:27 PM   #12
Ismellbacon
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Yes it is very possible I will not know till I get in there.
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Unread 10-08-2014, 07:50 PM   #13
Brewski
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You say Dana 30 but mean Dana 300, right? Not Dana 20? I assume you know the correct shift pattern for a 300? Just asking because I agree with others in that it sure sounds like it is in low. A Dana 300 should be pull it back all the way toward the console and then one position forward for 2H.
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Unread 10-08-2014, 09:22 PM   #14
Mike Romain
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Quote:
Originally Posted by Ismellbacon View Post
Yes it is very possible I will not know till I get in there.
You can just jack up one tire, mark it and the driveshaft with chalk for ease of counting and spin the tire twice while counting the driveshaft turns. This gives you the ratio on an open diff. If it has a traction device, you only need to turn the tire once.
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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 10-08-2014, 11:27 PM   #15
Unretarded
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Something does not add up.........5.38`s with 35 inch tires is approx 3350 at 65 mph...........thats what I have in mine. and 55 mph is definatly no problem
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