What would you put in a J20??? - JeepForum.com
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Unread 01-17-2014, 07:33 AM   #1
BigBlue9044
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1959 CJ5 
 
Join Date: Jan 2012
Location: Eden, MD
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What would you put in a J20???

I'll be picking up an '84 J20 in a couple weeks that's in pretty solid shape. My goal is to use it as a bit of a toy but mostly a tow vehicle for my wife's horses. Planning on doing a flatbed with a 5th wheel. It's set up now with a D44 front and D60 rear but other than that, the running gear is MIA.

With that said, I'm thinking a 6bt if I can find one that's reasonably priced (under $2k) but other than that I'm looking for some thoughts or opinions.

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'59 CJ5 w/ Ford 302, T-98, Dana 18 twin stick, Detroit Tru Trac Dana 30 (disc brakes!!!), Dana 44 3.92's, Saginaw swapped, power brakes and hydro clutch. Built-not-bought.
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Unread 01-17-2014, 09:10 AM   #2
strvger01
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1966 CJ5 
 
Join Date: Oct 2012
Location: Two Harbors, Minnesota
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yep, i'd go with the dodge 5.9L for sure. the early models, 1989-1998 will be the cheapest most likely. and the 12v doesn't need glow plugs for cold starts. good luck with your build, and don't forget pics!
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Unread 01-17-2014, 09:26 AM   #3
CSP
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J-truck with Cummins build thread: http://www.pirate4x4.com/forum/tow-r...kes-build.html
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Unread 01-17-2014, 08:51 PM   #4
JrTjK
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1978 FSJ Wagoneer 
 
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I'd vote for a Chevy 6.0/4l80.
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Unread 01-18-2014, 10:15 AM   #5
pcoplin
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Towing? I'd do a 6BT for sure.

If it's a just a driver, I;d do a Dodge 5.2/5.9 or a Chevy 5.3.
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Unread 01-19-2014, 11:43 AM   #6
super98lsc
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1999 WJ 
 
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Nothing will beat a diesel for towing and economy. The cummins would be hard to beat. I can say if your wanting to go the gasser route the GM 6.0 4l80e is a tough combo but will suck fuel under load around 6-9 mpg depending on winds,hills etc. No load it will get 20 ish. I leased a Penske truck with a 6.0 and the new 6spd version of the 4l80e that truck averaged 8-10 on flat interstate pulling a tandem axle car hauler with a 4 door accord on it. Never ran hot never used oil and had no issues passing traffic @ 65-75 it would go faster (not smart) but the governor shuts it down at 79. I was impressed with the power and mileage for a gas engine. I'm building a built 401 & 4l80e for my Wagoneer while I know the 401 will make more torque and hp it will not get the economy of the new LS.
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Unread 01-19-2014, 11:44 AM   #7
super98lsc
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Also the 4l80e has a very low 1st gear which helps get it rolling easier :-)
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 01-21-2014, 02:14 PM   #8
sandman_rides
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I happen to have a GMC Grumman utility truck with a 6BT and an Allison 3-speed automatic that might fit the bill nicely, has less than 75k miles on it... You'd have to get an adaptor for your transfer case, and maybe do a body lift... I was looking at doing the same thing for my Chief, but I hate to ditch the original engine and transmission... The truck is in Michigan, so not too awful far from you.
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Unread 01-23-2014, 01:46 PM   #9
462FSJ
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Big block I have has plenty of pulling power but if I were to go diesel is definitely take the 6bt
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