jmderyke Posted August 17, 2014 Share Posted August 17, 2014 I'm finally in the stages of swaping out the np 207 transfercase out of the truck. I have a 2.5 manual, long bed, and from what i remember its a 21 spline input on the transfer case, and on some of the np 231 they have 21 spline input count. Does anyone know what years they are? On the manual or auto Trans? And I heard there are different lengths of the transfer case also......IDK Thanks for the help Link to comment Share on other sites More sharing options...
yxmj Posted August 17, 2014 Share Posted August 17, 2014 If you get stuck you can swap the input of the 207 into a 231. It involves some wrenching but has been done. . :MJ 1: . Link to comment Share on other sites More sharing options...
87MJTIM Posted August 17, 2014 Share Posted August 17, 2014 I don't know about the 2.5, but the 4.0 changed from 21 to 23 splines when the BA 10/5 was swapped for the AX15. That was mid 89. Link to comment Share on other sites More sharing options...
yxmj Posted August 18, 2014 Share Posted August 18, 2014 I don't know about the 2.5, but the 4.0 changed from 21 to 23 splines when the BA 10/5 was swapped for the AX15. That was mid 89. I think he is asking about the trans to transfercase connection.....the motor would not be in the equation.....but your years are correct. Link to comment Share on other sites More sharing options...
87MJTIM Posted August 18, 2014 Share Posted August 18, 2014 I don't know about the 2.5, but the 4.0 changed from 21 to 23 splines when the BA 10/5 was swapped for the AX15. That was mid 89. I think he is asking about the trans to transfercase connection.....the motor would not be in the equation.....but your years are correct. That was when the trans to tcase spline count changed - for the 4.0. When the spline count changed for the 2.5, I don't know. If he gets a NP231 from an early 4.0, that will have the 21 splines. Link to comment Share on other sites More sharing options...
yxmj Posted August 18, 2014 Share Posted August 18, 2014 I don't know about the 2.5, but the 4.0 changed from 21 to 23 splines when the BA 10/5 was swapped for the AX15. That was mid 89. I think he is asking about the trans to transfercase connection.....the motor would not be in the equation.....but your years are correct. That was when the trans to tcase spline count changed - for the 4.0. When the spline count changed for the 2.5, I don't know. If he gets a NP231 from an early 4.0, that will have the 21 splines. I think you are missing my point here partner.......They did not build specific AX15's for I 4"s and I6's.....it is the same trans (some bellhousings could be differnt)...... The OP asked about the Trans to T-case join.....adding motors into the eqation just muddy's the waters...IMHO....now if you bring the AX5 into the equation that might clear up what you are thinking. (it would be different......) Here is some info to help http://www.novak-adapt.com/knowledge/np_nvg_input_gears.htm http://www.novak-adapt.com/knowledge/np231.htm Link to comment Share on other sites More sharing options...
jmderyke Posted August 18, 2014 Author Share Posted August 18, 2014 Thanks guys! that Novak adapt web page is key! now the trip to the salvage yard should be a little easier! Link to comment Share on other sites More sharing options...
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