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Old 03-20-2005, 10:51 AM   #1 (permalink)
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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
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Old 03-20-2005, 03:24 PM   #2 (permalink)
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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.
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Old 03-20-2005, 03:42 PM   #3 (permalink)
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Awesome thanks very much. I'll call them tommorrow
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Old 03-21-2005, 07:26 AM   #4 (permalink)
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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!
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Old 03-21-2005, 11:46 AM   #5 (permalink)
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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)?
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