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Unread 04-22-2010, 09:08 PM   #1
Hillbilly Jeep
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1990 YJ Wrangler 
 
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whats the differance 258 and a 4.2

just as the topic says.. what is the differance? i thought 4.2 and 258 is the same? now im confused...
thanks
Jeremy

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Unread 04-22-2010, 09:12 PM   #2
dodger889
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They are the same, you are not confused
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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Unread 04-22-2010, 09:13 PM   #3
ImpactFabWorks
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it's the same. Just say 258 when you want to sound like you have a bad *** motor
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Unread 04-22-2010, 09:14 PM   #4
dadstoys2
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4.2 is liters
258 is cubic inches
same engine
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87 Wrangler Ford 302
2"bodylift 5"suspension 35" bfg A/Ts
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Unread 04-22-2010, 09:14 PM   #5
MoparFreak69
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1990 YJ Wrangler 
 
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Location: Boise, Idaho
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One has 3 numbers, the other only 2. One has a decimal point, the other has none. That the only difference to me lol!
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90 YJ 5.2 Magnum, AX-15, 231 SYE'd
D44 front, welded/trussed AMC20HD rear. 4.56 gears soonish.
Western 6 lug aluminum wheels, with 35x12.50x15 Wrangler MTRs
[SIZE="5"][URL="http://www.jeepforum.com/forum/f22/myj-build-2-years-ago-today-1197236"]MYj Build[/URL][/SIZE]
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Unread 04-22-2010, 09:17 PM   #6
dadstoys2
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Quote:
Originally Posted by brian_nichols View Post
it's the same. Just say 258 when you want to sound like you have a bad *** motor
yeah it sounds bigger. But my "258" makes gobs of torque
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87 Wrangler Ford 302
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Np435 trans w/ np205
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Unread 04-22-2010, 09:17 PM   #7
Hillbilly Jeep
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quick reply guys thanks... i know it sounds stupid...i was lookin at clutch kits and they had a 90 yj listed with a 258 and a 90 yj with a 4.2...thats why i was confused... thanks guys
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Unread 04-22-2010, 09:21 PM   #8
Mark05059
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Location: quechee Vermont
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same clutch number I would hope??
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Unread 04-22-2010, 09:29 PM   #9
Old4X
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There are some minor differences, best to check the block numbers near the distributor to be sure what you have. Some of the differences I have run across:
oil filter (4.2 has metric threads)

head bolt sizes differ (some 1/2, some 7/16ths, still not sure which is on which)

different starter
different length pushrods
different flywheels
different pilot bushings
different rocker pivots

Some of these parts may interchange, some don't.
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Unread 04-22-2010, 09:38 PM   #10
Hillbilly Jeep
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hmmmm interesting... but i wonder why the clutches would be different?
thats good info tho
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Unread 04-22-2010, 11:09 PM   #11
viper21700
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Two different clutches... Early model year 1990's had the BA-10 peugot tranny, later models had the Aisin Warner AX-15 trannys installed. Thats why on 1990's you need to verify your tranny before you get a clutch.
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Unread 04-22-2010, 11:13 PM   #12
dadstoys2
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Not sure if it matters but when doing the swap from ba10 to ax15 I used my clutch and pressure plate from the ba10.
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Unread 04-22-2010, 11:25 PM   #13
ImpactFabWorks
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All 1990 YJs had ax-15s. It was in 89 that they used both.
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