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np 231 question

989 views 9 replies 8 participants last post by  JrP  
#1 ·
NP 231, is it the stock case for a 2000 TJ Sport?
 
#2 ·
yeah, all TJ's have a 231 unless its a Rubislut, then its a 241OR
 
#5 · (Edited)
Just make sure the person selling the np231 knows what they have.
The plate on the back might say 231, but it doesn't mean it will work with your vehicle. I haven't found a web site that de-codes the plate. The input spline count might be different, 21, 23, 27. You need to know yours so, you know what to look for.
Scout Dork
 
#6 ·
The only input splines on the NP 231 are 21 and 23. 21 splines came with ALL 4 bangers and the 4.2Ls and the 23 splines are on ALL 4.0L.
 
#7 ·
Some people sell chevy 27 spline np231's, as just a np231.

That's why I posted that you need to know what the seller has, and what you need.

Just research different engine /tranny combos and you can find what you need.

Scout Dork
 
#9 · (Edited)
'87-'89(?) Wranglers and Cherokees with straight six engines and 5spds are 21spline inputs to the transfer case. The Peugeot was the trans used in those models, and had a 21 spline output shaft. Not sure of last model year used.

Chrysler dropped the BA5-10 (Peugeot) in favor of the AX15. The AX15 has a 23 tooth output shaft.
 
#10 ·
you have to watch input lengths also. Cherokee and ones from behind an ax 15 have short inputs. Th autos in wranglers have long inputs. If you use a short input in an auto it will leak like a sive out of the weep hole. Been there done that. Tera makes a bad ass seal extender that works great.