Cam considerations for passing - JeepForum.com
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post #1 of 14 Old 07-31-2020, 04:34 PM Thread Starter
davecove
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Cam considerations for passing

I am in the middle of a '95 4L rebuild and am considering a different cam.

I will be using this Jeep as a daily driver on an island with winding roads and frequent encounters with slow moving traffic. The nature of the roads limits top cruising speed to about 45mph max. The ability to go from 25 mph to 45 or 50 mph in the available straight(ish) stretches like a spooked rabbit is what I need.

I'm thinking about one with a .40 lift on the intake and a .50 on the exhaust but I am unsure about the advance, duration and separation.

I'd love to hear your thoughts on this and any other mods I can make to the drive train to improve pickup and passing performance.

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post #2 of 14 Old 07-31-2020, 04:45 PM
JeeperDon
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If you're in a 45 max MPH environment and looking for performance, just swap the gears. If it's an automatic, swap in a male transmission.

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post #3 of 14 Old 07-31-2020, 04:48 PM
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Re-gearing the axles would take care of it without having to mess with trying to get it tuned properly for a different cam.
From the factory, the Jeep was geared to run at highway speeds. If you never get to highway speeds, you can gear it for a lot more low end power.
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post #4 of 14 Old 07-31-2020, 05:47 PM
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FWIW in my archives.

THe guys are right GEARS - MAYBE MAYBE tire size a thought... Smaller?

https://cdn.xjjeeps.com/pdf/en-us/je...ines-guide.pdf

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 14 Old 07-31-2020, 06:20 PM Thread Starter
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Quote:
Originally Posted by jtec View Post
FWIW in my archives.



THe guys are right GEARS - MAYBE MAYBE tire size a thought... Smaller?



https://cdn.xjjeeps.com/pdf/en-us/je...ines-guide.pdf
It's got stock tires right now but we want a 3" lift and 31" tires so a regear is certainly in our future now.

Thanks for the manual!

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post #6 of 14 Old 07-31-2020, 10:35 PM
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Just curious, what island are you on?
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post #7 of 14 Old 08-01-2020, 10:46 AM Thread Starter
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Really stupid question here: Do the front and back ratios need to be the same?
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post #8 of 14 Old 08-01-2020, 11:06 AM
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post #9 of 14 Old 08-01-2020, 01:17 PM
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Quote:
Originally Posted by davecove View Post
It's got stock tires right now but we want a 3" lift and 31" tires so a regear is certainly in our future now.

Thanks for the manual!

Sent from my moto x4 using Tapatalk
If you're planning larger tires and want better acceleration, then for sure gears, and a good tune up.

Whats over that next ridge?
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post #10 of 14 Old 08-01-2020, 01:32 PM
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Quote:
Originally Posted by davecove View Post
Really stupid question here: Do the front and back ratios need to be the same?
Definitely need to be the same ratio, otherwise the axles will be trying to spin at different speeds and something in between (likely the t-case) WILL go SNAP.

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post #11 of 14 Old 08-02-2020, 07:40 AM
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Quote:
Originally Posted by JeeperDon View Post
If you're in a 45 max MPH environment and looking for performance, just swap the gears. If it's an automatic, swap in a male transmission.

a male transmission? Now that's funny. I always like female transmissions so I can drink a beverage while I'm driving lol.
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post #12 of 14 Old 08-02-2020, 03:21 PM Thread Starter
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So would this do the trick moving my front axle D30 up to 4.10?
https://www.quadratec.com/products/52419_2004.htm
Seems like a good brand (Dana) and a good price.
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post #13 of 14 Old 08-02-2020, 03:49 PM
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That's only for the front axle and it's only the gears. Personally, if I were tearing the axle apart to re-gear it, I'd also replace the bearings.
You'll also need shim packs and bolts (never re-use old diff bolts) and a few other odds and ends.
What you should be shopping for is what they call "master install" kits, which will come with all those extra items you are going to need.

For what you're talking about, I think 4.10s aren't enough. Especially if you're going to go to bigger tires. With the bigger tires and your need for more low end grunt and no need for top end speed, you might want to go more radical than just 4.10s
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post #14 of 14 Old 08-02-2020, 06:11 PM Thread Starter
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Yeah, I know about all of those extra parts... I've been watching A LOT of YouTube videos on rebuilding the D30. One thing tho... my unit has a pair of giant red o-rings just outboard of the diff bearings. I haven't seen those in many videos and am wondering what they are for.

I was wondering if 4.10 would be enough... Not opposed to 4.56

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