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Unread 12-02-2011, 12:05 PM   #1
CaptainCaveman
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1988 YJ Wrangler 
 
Join Date: Sep 2008
Location: Colorado
Posts: 39
'88 yj

Hey all...

Been lurking here for a LOOOONG time. But I finally got another Jeep. Well, should say got my WIFE another Jeep (Christmas present). She's been bugging me for years since we got rid of our '74 CJ5 back in '95.

So I picked up a little '88YJ. It's bone stock with the 258/904/231. Now it does run a little rough as it has 2 cylinders with low compression, but it does run and runs rather well after it warms up. It's black on black with hard, soft and bikini tops, and almost brand new 30x9.5x15 BFG's X5. The only aftermarket add on is a rather nice Kenwood (I think) stereo. It even has the ORIGINAL jack under the hood! Best of all was the price. I figured I couldn't go wrong for $700!!!

Now for the meat of my post. Since the engine will need a rebuild at some point in the near future, I was thinking of just going ahead and swapping in a V8. What I want to put in there is a Dodge 5.2/46RH/231 combo. The biggest concern I have is with the tranny length. Is this doable without doing a WB stretch? Or should I just go with a 350/700R4/231?

Thanks guys. And it's good to be able to actually post on here instead of looking at everyone else's rides and dream.

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Unread 12-02-2011, 12:18 PM   #2
mrmud4x4
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1988 YJ Wrangler 
 
Join Date: Nov 2008
Location: Rocky Mount, NC
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Welcome.

I have the straight six......I like V8 power but that six I have was rebuilt by the PO....I added a motorcraft carb....ford TFI....runs great...got about 30k on the engine since rebuild. I have the 4.10 gears in it now.....she'll climb a wall in 4wheel lo......

Only thing I want to do is add the TBI injection kit....

Plus you have an automatic......easy on the left knee when wheelin....

Anyway......enjoy your new ride!!

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Unread 12-03-2011, 04:24 PM   #3
wendell
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1987 YJ Wrangler 
 
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Yeah, I built my 258 as well. I added an offy intake, holley TA 470 4 barrel, comp cam, rollor rockers, hipo pistons, header, ported head, DUI, and MSD. It runs like a small V-8 and didn't have to screw around with trannies, motor mounts and other engine swap pains. The 258 can also be fuel injected if you perfer and swap on a 4.0 head.
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Unread 12-03-2011, 04:41 PM   #4
roadyrob
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1987 YJ Wrangler 
 
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I'm another fan of the 258. simple to work on and once you get rid of the carter and upgrade the diizzy it has plenty of power.
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Unread 12-03-2011, 06:02 PM   #5
CaptainCaveman
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Ok...Ok. Jeez you guys I'll rethink the V8 thing.

But the question still remains about the tranny. I want to keep the auto, but really want OD.
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Unread 12-03-2011, 06:38 PM   #6
Fin_Reaper
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1988 YJ Wrangler 
 
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Location: Stayton, Oregon
Posts: 143
Going to the 5.2 was the best thing I ever did to my '88. Awesome power, 40% boost in fuel mileage (when my foots easy on the skinny pedal) and no more lawnmower smell.
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Unread 12-03-2011, 07:26 PM   #7
superj
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put a 302 in it. it bolts to your automatic tranny. you won't get over drive but you don;t have to mess with worrying about tranny length.

if you for sure want the od, i can't help with the question
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Unread 12-04-2011, 06:40 AM   #8
mrmud4x4
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The preceding posts are just a testament to how decent the 4.2 is....

Check out this link and go through their pages...loaded with conversion info:

http://www.novak-adapt.com/
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Unread 12-04-2011, 07:19 AM   #9
staush
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I'm running the 258 in an 88 with auto,carter carb and an H.E.I. dizzy with the rear lincoln locked with 33s and I love it.Enough power to take me most any where and still get decent fuel mileage.
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Unread 12-04-2011, 07:30 AM   #10
superj
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What is decent mileage? My 87 gets 11 and is basically stock. I am auto, Holley carb, and 30" tires. No lift
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Unread 12-04-2011, 07:45 AM   #11
staush
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Right around 15mpg on the highway(2 lane).But I'm easy on the skinny pedal and I run 4.10 gears.I run the speed limit but nothing to crazy.I don't use as my D.D.Just for getting to the trail or downtown or to the club meetings.(usaly about 40 miles one way.)Our weekend rides consist of 100-200 miles on Sat.99%dirt
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Unread 01-11-2012, 05:23 PM   #12
CaptainCaveman
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Well I FInnnally took some pictures of the Wife's new Jeep.

They are great, but you get the idea...
1325961678167.jpg   1325961686537.jpg   1325961697212.jpg   1325961729436.jpg   1325961752416.jpg  

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Unread 01-11-2012, 05:24 PM   #13
CaptainCaveman
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One more...

The bone stock 4.2
1325961817094.jpg  
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Unread 01-11-2012, 05:57 PM   #14
scifone
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If you want overdrive you should look into a AW4 swap out of a cherokee.
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Unread 01-11-2012, 09:51 PM   #15
DirtyYj91
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First thing I have to say is that you Stole that jeep at $700. My first one was an 83 Cj that had not a floor left in it and I gave $800 for it 'cause the frame was solid and it ran.
I have a '91 Yj now with the Auto (TF999) but with the 4.0L, and with having the Cj with the 100k plus mileage 258 and to having the comparable mileage 4.0L I would go with the 4.0L as the simplest swap.
My best friends 88 Yj threw a rod in his 258 that was also rode hard and he swapped in a 4.0L HO long block out of a Zj or Grand Cherokee and it was night and day with power and fuel mileage although we kept the Motorcraft Carb and the stock intake ( this took two people to get the ports and bolts all lined up but it sealed.)



So for an ending I would say if you have the Money to sink into an expensive machine shop rebuild of boring and decking the engine, probably around $1000, then by all means have a newer engine. I don't think the overdrive trans like AW4 work as an easy swap because they are too long for the WB. But a Junkyard lowest mileage 4.0L high output for $400 is very doable in a day.
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