CJ5 set-up - JeepForum.com
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post #1 of 10 Old 06-02-2020, 05:23 PM Thread Starter
Jeepers74017
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CJ5 set-up

Hey all! I'm new here so hopefully I am in the correct forum for this question. I just bought a 1980 CJ5 and was planning on a full restore, however, after purchasing I found out according to the vin it was built with the 4 cylinder. It currently has a 304 in it... so instead of rebuilding the 304 I'm going to buy a crate 360 to drop in it. It has the T176 tranny and a Dana 300 transfer. I'm not planning on doing much offroad and just want it to drive around in so what gears and axles would be best for that kind of usage? And is that a proper transmission for just occasional driving? Really would like to get a little bit more range for 1st and 2nd gears. Any help would be much appreciated! Thanks

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post #2 of 10 Old 06-02-2020, 07:39 PM
oldschool74cj5
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hello

the transmission and transcase are one of the best ones that came with a cj. what you are asking for gearing depends on what size tires you are looking at running. there are charts out there. 33" a good gear for more street driving is 3.73 offroad would be 4.10 to 4.56 for power. here is a link for the chart on quadratec.

https://www.quadratec.com/c/referenc...r-larger-tires

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post #3 of 10 Old 06-02-2020, 10:03 PM Thread Starter
Jeepers74017
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Awesome!! Thank you so much!!
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post #4 of 10 Old 06-02-2020, 11:08 PM
pedal2themetai
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Hi be careful changing gears if you are changing the gears in the differentials If you change one you need to match the other to it.. or it well be unsafe in 4 wheel drive.. IE if you change the rear end to a higher gear and then try to run it in 4 wheel drive you well be pushing the front around very unsafe in slick conditions or vise a versa if you put lower gears in the rear and go into 4 wheel drive you well be draging the back end around.. JUst an FYI when changing differential gears..
OH same thing with tire sizes ..
good luck
tim
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post #5 of 10 Old 06-03-2020, 12:13 AM
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With a good 360 I would not go below 3.73 with 33" tyres, there is plenty of torque to make 1st work really well on and soft off road on a lightweight utility vehicle (you will smoke the tyres). You will appreciate having a leggy top gear if you are on highway, you will not be dropping down to 3rd on inclines due to the 360 but you will want to keep the revs down for your hearing and wallet, top is not an overdrive gear.

If you are off road the T176 is not hugely low in 1st so its crawl speed is a little high with 3.73 gears, but if you are not going too hard core I doubt you would notice.

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post #6 of 10 Old 06-03-2020, 05:16 AM
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Since your Jeep is already set up, you can run it and see what RPM's you currently have at a specific cruising speed (60MPH). Choose where you want the new engine to be spinning and compare the two numbers. That should help drive your gearing decision.


I would prefer a 360 be somewhere in the 2K range at that speed.


Don't forget, the taller the gearing, the taller first gear becomes.




As far as axles, given your intended application, I wouldn't hesitate to run your current set with the addition of a set of one piece axles in the rear.

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post #7 of 10 Old 06-03-2020, 05:23 AM
bob4703
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What is your current gearing? If it came with a for cylinder engine it may have 3.90s or lower gears.

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post #8 of 10 Old 06-03-2020, 09:54 AM
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For daily driving with a big V8 like that, 3.54 gears work just fine. I have a mild 305 and have no problem lighting them up with 3.54 stock gears.

edit: I run 33" tires, not sure what size you are thinking.

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post #9 of 10 Old 06-03-2020, 10:11 AM
80cj
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Quote:
Originally Posted by bob4703 View Post
What is your current gearing? If it came with a for cylinder engine it may have 3.90s or lower gears.
3.90's were never available in Jeep AMC 20's. I believe the 4 cylinder standard ratio was 3.73 but not positive. Best to check the tag on the front diff or letter code on the rearend.
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post #10 of 10 Old 06-03-2020, 10:12 AM
Matt1981CJ7
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Gearing recommendations are difficult without knowing what tire size the OP plans on running.

Matt
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