Full Size Jeep Network

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.

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.

Understood, thank you!

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



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.

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

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

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.