4.88 and 33 trouble - JeepForum.com

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post #1 of 5 Old 04-05-2013, 04:20 PM Thread Starter
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1990 YJ Wrangler 
Join Date: Jul 2010
Location: south jersey
Posts: 15
4.88 and 33 trouble

just finished putting my whole rig together...4.2, 5 speed and 4.88s and 33s. tooks its first ride and well it sucks 5th gear is revin up to 3k at about 45-50 mph is my speedo gear is correct, but other than that, advice from guys who have seen this?

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post #2 of 5 Old 04-05-2013, 04:24 PM
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1995 YJ Wrangler 
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Location: Brazoria
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I run 4.88 on 32s, and I hit 3k at 60-65ish, I believe, so yours should hit it at probably around 65-70.

If you've got a smartphone, download on of the free speedometer apps (I use Ulysses) to verify your actual speed. If you haven't changed out your speedo gear, it'll definitely be off.

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post #3 of 5 Old 04-05-2013, 04:43 PM Thread Starter
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1990 YJ Wrangler 
Join Date: Jul 2010
Location: south jersey
Posts: 15
im almost positive i changed the speedo gear when i did the SYE kit but cant be 100%....and it definitely did not feel like 65...not even 50 to be honest but the app could give me another clue for sure
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post #4 of 5 Old 04-05-2013, 05:13 PM
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1993 YJ Wrangler 
Join Date: Jun 2011
Location: Surprise,
Posts: 645
with .85 OD you should be doing 70mph with 33's and 4.88's at 3000rpm.
in 4th you should be doing 40mph at 2000rpm, 50mph at 2500rpm and 60mph at 3000rpm

This is based on a 32.7" tire as a 33. The 4th gear info is best because it's always 1:1 for us 5speeders, cant be sure your 5th is the same as my 4banger.

93' YJ 2.5L, 4.88's, 8.8, E-Locker & LSD
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post #5 of 5 Old 04-05-2013, 05:24 PM
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1988 YJ Wrangler 
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Location: lubbock
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Not sure if this will help you at all, but with my 4.56 gears and 35's at 70 in 5th gear I am turning around 2200-2300rpm. 4.0 with ax15. I am by GPS and the speed control signs they put on the side of the road about 2 mph faster on my speedometer than what those two say.
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