NP 231 Input question - Pirate4x4.Com : 4x4 and Off-Road Forum

cherokee kidd · 03-20-2005, 10:51 AM

I purchased a 231 out of a wrangler(square headlight era) with a 23 spline input that is short. I have a tf 904 to install it to but that needs the long input. I couldn't call anyone because none of the adapter places I deal with are open on the weekends. I know the difference in length is .9 of an inch and it seems to make good contact on the shaft with the short input so all I could see the extra length being for is to seal the rear of the tranny. I have an old 231 (85 or 86) with the long input but a different cut on the gear. If I took the length I need off that shaft and slid that on the trans shaft first as a bushing would that be ok. I have access to a lathe so it can be cut accurate. I might be getting carried away becuse the input might be cheap but I can't find out till tomorrow and this is bothering me

CODE5337 · 03-20-2005, 03:24 PM

The problem is your short input shaft (NP231) will not have enough length to grab the seal in the adapter between the trans/T-case, thus will dump ATF all over and make big messes and make you mad (BTDT).

If you dont change to the longer input, here is what you need:

TeraFlex sells it under this part number:TL621

Works great to slove this problem.

cherokee kidd · 03-20-2005, 03:42 PM

Awesome thanks very much. I'll call them tommorrow

Go_Vols · 03-21-2005, 07:26 AM

Clarification -- you have a TF904 with a long OUTPUT shaft, and a 231 with a short INPUT (female) receptacle, right?

If so, cut output to a correct length, check the tolerance, slap on some RTV and bolt'em up!

CODE5337 · 03-21-2005, 11:46 AM

Quote:

Originally Posted by Go_Vols

Clarification -- you have a TF904 with a long OUTPUT shaft, and a 231 with a short INPUT (female) receptacle, right?

If so, cut output to a correct length, check the tolerance, slap on some RTV and bolt'em up!

So how does this affect the length of the adapter (where the seal seats)?

03-20-2005, 10:51 AM	#1 (permalink)
cherokee kidd epic proportions Join Date: Feb 2004 Member # 27832 Location: Modesto,Ca Posts: 708	NP 231 Input question I purchased a 231 out of a wrangler(square headlight era) with a 23 spline input that is short. I have a tf 904 to install it to but that needs the long input. I couldn't call anyone because none of the adapter places I deal with are open on the weekends. I know the difference in length is .9 of an inch and it seems to make good contact on the shaft with the short input so all I could see the extra length being for is to seal the rear of the tranny. I have an old 231 (85 or 86) with the long input but a different cut on the gear. If I took the length I need off that shaft and slid that on the trans shaft first as a bushing would that be ok. I have access to a lathe so it can be cut accurate. I might be getting carried away becuse the input might be cheap but I can't find out till tomorrow and this is bothering me __________________ ♣Bink'sFabrication♣ NEW SHOP in Salida, Ca facebook.com/binksfab Tube bending, mig and tig welding, rollcage design, and cnc plasma cutting avaliable. For info call (209)402-6433

03-20-2005, 03:42 PM	#3 (permalink)
cherokee kidd epic proportions Join Date: Feb 2004 Member # 27832 Location: Modesto,Ca Posts: 708	Awesome thanks very much. I'll call them tommorrow __________________ ♣Bink'sFabrication♣ NEW SHOP in Salida, Ca facebook.com/binksfab Tube bending, mig and tig welding, rollcage design, and cnc plasma cutting avaliable. For info call (209)402-6433

03-21-2005, 07:26 AM	#4 (permalink)
Go_Vols Registered User Join Date: Jul 2002 Member # 12691 Location: Houston Posts: 1,012	Clarification -- you have a TF904 with a long OUTPUT shaft, and a 231 with a short INPUT (female) receptacle, right? If so, cut output to a correct length, check the tolerance, slap on some RTV and bolt'em up! __________________ "Lil'T" - 99TJ RC60/14B/Klune 4:1/Atlas 6:1/H1/44"TSLs/PSC Full-Hydro... Rollover Ratio = 1.0:3 [url]www.tgtwoffroad.com[/url]

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03-20-2005, 03:24 PM	#2 (permalink)
CODE5337 Newbie Join Date: Mar 2005 Member # 44160 Location: Rifle, Colorado Posts: 62	The problem is your short input shaft (NP231) will not have enough length to grab the seal in the adapter between the trans/T-case, thus will dump ATF all over and make big messes and make you mad (BTDT). If you dont change to the longer input, here is what you need: TeraFlex sells it under this part number:TL621 Works great to slove this problem.