New owner, question about which engine I have

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mbwinter633
Posts: 7
Joined: Sun Apr 18, 2021 3:24 pm

New owner, question about which engine I have

Post by mbwinter633 »

Hey yall, I am picking up a 1971 J2000 truck next weekend and I had a question about which engine and transmission is has in it. Ive read a lot of articles and vin decoders but have gotten some mixed messages. Mainly because I have read that all 71s have the 358 while someone else said they switched from the 232 to the 258 mid year.
I know it is a straight 6 and a manual transmission but I need to know which ones. The truck was manufactured in june 1971. And the Vin is 2406W17400XXX. I know there is a code on the side of the engine, but I cannot get to the truck until next weekend and wanted to have as much info about it as possible so I can be ready when I pick it up. Can yall give me some guidance please? Thank you!
Ps Im super excited to be joining the community! Ive always wanted a jeep truck and feel very blessed to be getting one.
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Stuka
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Re: New owner, question about which engine I have

Post by Stuka »

Welcome!

Here is your VIN decoded:

24 = J-2000, 4WD, Gladiator
06 = J-2500 Cab & Chassis, Truck
W = J-2500, J-4500 5000# GVW
1 = Left Hand Drive
7 = 6-232 & 6-258 w/Smog
400 = 6-258

So, you *should* have a 258. But the only real way to tell is to look at the size of the exhaust ports. They dont have the displacement cast into them like the AMC V8s did.
2017 JKU Rubicon
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

Topic author
mbwinter633
Posts: 7
Joined: Sun Apr 18, 2021 3:24 pm

Re: New owner, question about which engine I have

Post by mbwinter633 »

Understood, thank you!
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tgreese
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Location: Medford MA USA

Re: New owner, question about which engine I have

Post by tgreese »

The sixes have the engine build code stamped into the side of the block.

You need the '62-73 J-series parts catlog, available free to read and download here:
https://oljeep.com/edge_parts_man.html

Image

I would expect "A" or "E." You'll have to look at the truck.

The transmission will be a Borg-Warner T-14 if a 3-speed, and a Borg-Warner T-18 if 4-speeds (truck-type 4-speed, with a "granny" 1st gear.)

hth! Post pics when you can.
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Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.

Topic author
mbwinter633
Posts: 7
Joined: Sun Apr 18, 2021 3:24 pm

Re: New owner, question about which engine I have

Post by mbwinter633 »

Fantastic, thank you! I will surely post some pics when I bring her home!

Topic author
mbwinter633
Posts: 7
Joined: Sun Apr 18, 2021 3:24 pm

Re: New owner, question about which engine I have

Post by mbwinter633 »

Well, I got it home today and the code is 405B13. Thanks for everyone help, I am super excited to start working on her!

http://imgur.com/gallery/lxJOtZb
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tgreese
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Joined: Fri Jun 08, 2012 6:31 am
Location: Medford MA USA

Re: New owner, question about which engine I have

Post by tgreese »

Truck looks good. Congratulations!

May 13, 1971. Late in the model year. The '72s were tooling up by summer.

First B I've seen. Huh. I wonder if there is a story behind that.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
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