what spline input shaft np231?? - Pirate4x4.Com : 4x4 and Off-Road Forum

CrazyCraig · 12-06-2001, 05:52 PM

I was wondering how many splines on a np231 that is in a 1989 yj 6cy with and auto. I just bought the yj and didn't realize the t-case was cracked, front drive shaft pogo'd the t-case. I have some out of a 4 cyl 5 speed (21 spline), can the input shafts be interchanged between the t-cases??

Craig

AzJeep · 12-06-2001, 06:29 PM

Quote:

Originally posted by CrazyCraig
I was wondering how many splines on a np231 that is in a 1989 yj 6cy with and auto. I just bought the yj and didn't realize the t-case was cracked, front drive shaft pogo'd the t-case. I have some out of a 4 cyl 5 speed (21 spline), can the input shafts be interchanged between the t-cases??

Craig

Should be 23 spline with the auto, according to an AA table I have.

Josh 89XJ · 12-06-2001, 06:47 PM

89 was a funky year with the AW4 231 combo. Some of them had 21 spline. Gotta pull it and check.

Steevo · 12-06-2001, 07:22 PM

Yes, the input shafts can be swapped

WyoJeeper · 12-06-2001, 07:26 PM

89s with the 6 and auto had the TF999 not the Asin tranny. And its 23 spline.
Rick

DE Jeeper · 12-07-2001, 06:39 AM

What year is the 4 cyl t-case. If both cases are YJ cases all the parts are intercangable. The case behind the auto will be a "long" 23 spline input. The 4 cyl, 5 spd will have a "short" 21 spline input. T-cases with AX-15's in front of them had "short" 23 spline shafts. You can not swap TJ t-case input parts because they changed the input bearing style. In short it the cases are both from a YJ or XJ you can swap parts. I would buy a new chain while you have it apart, but that is just my $.02.

12-06-2001, 05:52 PM	#1 (permalink)
CrazyCraig Registered User Join Date: Nov 2000 Member # 2358 Location: Pittsburgh, PA Posts: 293	what spline input shaft np231?? I was wondering how many splines on a np231 that is in a 1989 yj 6cy with and auto. I just bought the yj and didn't realize the t-case was cracked, front drive shaft pogo'd the t-case. I have some out of a 4 cyl 5 speed (21 spline), can the input shafts be interchanged between the t-cases?? Craig __________________ 1992 YJ "Pepe`" soon to be for sale 1994 YJ "??" for sale Ever stop to think and forget to start again

12-06-2001, 06:47 PM	#3 (permalink)
Josh 89XJ Registered User Join Date: Sep 2001 Member # 7051 Location: The thriving metropolis known as Pullman Posts: 661	89 was a funky year with the AW4 231 combo. Some of them had 21 spline. Gotta pull it and check. __________________ There's no time like the present....well, except for that time you did two chicks at once. That was WAY better than the present!

12-07-2001, 06:39 AM	#6 (permalink)
DE Jeeper Mr. FixIt Join Date: Jun 2001 Member # 5295 Location: Wilmington, DE Posts: 517	What year is the 4 cyl t-case. If both cases are YJ cases all the parts are intercangable. The case behind the auto will be a "long" 23 spline input. The 4 cyl, 5 spd will have a "short" 21 spline input. T-cases with AX-15's in front of them had "short" 23 spline shafts. You can not swap TJ t-case input parts because they changed the input bearing style. In short it the cases are both from a YJ or XJ you can swap parts. I would buy a new chain while you have it apart, but that is just my $.02. __________________ '88 YJ with not much '88 YJ left We-Rock Stock Class Team Mall Crawler #609 Sponsored by: The Drive Shaft Shop www.driveshaftshop.com Delaware Jeep Assoc. www.delawareja.com

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12-06-2001, 07:22 PM	#4 (permalink)
Steevo Registered User Join Date: Dec 2001 Member # 8584 Location: College Station Posts: 7	Yes, the input shafts can be swapped

12-06-2001, 07:26 PM	#5 (permalink)
WyoJeeper Registered User Join Date: Jun 2000 Member # 1040 Location: Oregon Posts: 432	89s with the 6 and auto had the TF999 not the Asin tranny. And its 23 spline. Rick