JB Conversions NP231J HD Super Short SYE Reviews, Ratings, Specs & Prices
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SYE Kits Next Product

JB Conversions NP231J HD Super Short SYE

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Product Information

MSRP: $597.20
Average Price: $303.15
Manufacturer: JB Conversions
Yes: 20 / No: 0

Since 1994, our company has sold the "HD Slip Yoke Eliminator" kit for all models of the NP231 transfer case. With many thousands of HD kits on the trail, we have had 100% success with not one failure. The target market of our original HD SYE kit was the Jeep YJ and TJ. The typical Jeep suspension lift in past years was 3.5" to 4". Suspension companies have now moved into the next level of design often call "long-arm" kits. These new suspensions yield high travel and high lift. The HD SYE kit that was once more than adequate is now coming up a bit short. For suspensions in excess of 4 inches, we have designed a new HD SYE kit that shortens the overall length of the NP231 by another 3-1/8" over the standard HD SYE.


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Registered User
MarkC73's Reviews
10-16-2015, 01:31 PM
Price: $231.00
Pros: Superior Quality product
Cons: none
Recommended? Yes

Comments: Quality designed product, easy installation, doesnt get much better than this.


Registered User
CharlieHo's Reviews
04-30-2014, 07:55 PM
Price: $299.00
Pros: Makes for the longest driveshaft you can get
Cons: None
Recommended? Yes

Comments: As with any SYE kit, get GOOD snap ring pliers!

I did the install with the TC still in the Jeep.

Registered User
yukonblu's Reviews
01-04-2011, 11:20 PM
Price: $300.00
Pros: Great for auto transmissions with short driveshafts.
Cons: none
Recommended? Yes

Comments: If you have a super short driveshaft like the ones on an auto trans i would get theys SYE. Quiets down your vibrations with you suspension lifts over 3". Highly reccomend.

Registered User
attackcammel's Reviews
12-22-2010, 07:07 PM
Price: $299.00
Pros: Longer drive shaft
Cons: need to buy something to adjust the speedo
Recommended? Yes

Comments: Thi9s product is great easy install left the t-Case in while doing it pictures in instructions could be better tho


Registered User
dendrophobe's Reviews
12-29-2009, 08:03 PM
Price: $300.00
Pros: Gives longest drive shaft length of any SYE on the market, very tough, well built
Cons: Electric Speedo only
Recommended? Yes

Comments: Easy install, tough design, and offers the longest driveshaft length of any SYE on the market. IIRC it's about 4 inches shorter than many other kits. Definitely a good investment.


Registered User
jason0923's Reviews

03-12-2009, 02:34 AM
JB Conversions NP231J HD Super Short SYE
Price: $400.00
Recommended? Yes

Comments: good product easy to install my friend did his under the jeep i took mine out and it was still same time he had lift though

Registered User
Cross's Reviews

01-14-2009, 02:08 AM
JB Conversions NP231J HD Super Short SYE
Price: $299.00
Recommended? Yes



jboy416's Reviews

01-03-2009, 02:19 PM
JB Conversions NP231J HD Super Short SYE
Price: $399.00
Recommended? Yes

Comments: geat quality. great instructions. everything you need included. added 8.5" to me overal driveshaft length.


Registered User
Roknut's Reviews

10-30-2008, 04:12 PM
JB Conversions NP231J HD Super Short SYE
Price: $300.00
Recommended? Yes

Comments: Very well thought out product. Gives the most length for rear driveshaft of any SYE out there. Easy to install with a few basic tools.

Registered User
Guns's Reviews

09-17-2008, 02:04 PM
JB Conversions NP231J HD Super Short SYE
Recommended? Yes

Comments: I haven't had any trouble with this kit. I did call them up to get a slightly shorter output yoke for the rear end to reduce my angle. They were very helpful and sent me exactly what I needed.

Registered User
thomasj7186's Reviews

06-08-2008, 06:43 PM
JB Conversions NP231J HD Super Short SYE
Price: $250.00
Recommended? Yes

Comments: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aa

Registered User
XJKyle1389's Reviews

04-19-2008, 09:47 PM
JB Conversions NP231J HD Super Short SYE
Recommended? Yes

Comments: love it!!

Kiwi Jeeper

Registered User
Kiwi Jeeper's Reviews

04-11-2008, 03:53 AM
JB Conversions NP231J HD Super Short SYE
Pros: Solid construction.
Cons: None.
Recommended? Yes

Comments: Great product. Easy install. No more vibes.

Registered User
asw613's Reviews

04-11-2008, 01:42 AM
JB Conversions NP231J HD Super Short SYE
Price: $597.20
Recommended? Yes

Comments: This thing is amazing. No more vibes. Just remember that with a CV drive shaft, the shaft angle is to be equal to the pinion angle with all the flex on the Double Carden. Plus mine came with a Tom Wood's shaft


Junior Member
Cody's Reviews

04-02-2008, 03:06 PM
JB Conversions NP231J HD Super Short SYE
Price: $3.00
Recommended? Yes

Comments: Test Test

Registered User
william_indorf's Reviews

03-22-2008, 08:25 PM
JB Conversions NP231J HD Super Short SYE
Price: $280.00
Recommended? Yes

Comments: sye


firecap4's Reviews

03-17-2008, 01:33 AM
JB Conversions NP231J HD Super Short SYE
Recommended? Yes

Comments: good quality i liked the idea of being able to get a little bit longer driveshaft and the install was a piece of cake

Registered User
USMCGunner's Reviews

03-06-2008, 04:11 PM
JB Conversions NP231J HD Super Short SYE
Price: $300.00
Recommended? Yes

Comments: Yeah, it's an SYE.


Registered User
jetter's Reviews

08-18-2007, 06:46 PM
JB Conversions NP231J HD Super Short SYE
Price: $290.00
Pros: great quality, super short, easy install
Cons: none
Recommended? Yes

Comments: Install took me two short nights. After reading several install instructions and tips from the web, I decided to leave the transfer case in the Jeep. Other than working on your back the whole time, it was a breeze. I bought this SYE with a Tom Woods driveshaft and it suprised me how much vib I was getting before or should I say how smooth it felt afterwards. I now have 3000+ miles on mine, a bigger lift, taller tires and have had no problems. BTW: The speed sensor plug on my '00 TJ fit fine.


Registered User
Wmorgan1995's Reviews

05-22-2007, 06:27 PM
JB Conversions NP231J HD Super Short SYE
Pros: High quality, install not to difficult
Cons: speed sensor connector
Recommended? Yes

Comments: I installed this SYE with a Tom Woods CV drive shaft. Very happy with the quality and the install was very easy, I had the TC out of the Jeep so I don't know how difficult it would be still bolted in. The only thing I didn't like was the fact that the new electric speed sensor plug didn't fit the plug on the jeep, I called about this and I was told that an adapter was not available. It was as simple as cutting and splicing and it was fine but still. Other then that could'nt be happier.

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