redneckjeep87
Landscaper Extroidanaire
- Joined
- Oct 10, 2007
- Location
- Woodleaf, NC
would i need to change the output shaft if i took a t350 tranny that WAS mated to a np231 and mated it TO a np203?
t350 shafts
- Thread starter redneckjeep87
- Start date
redneckjeep87
Landscaper Extroidanaire
- Joined
- Oct 10, 2007
- Location
- Woodleaf, NC
and if so, how much would it cost me?
TheGriz
Well-Known Member
- Joined
- Apr 6, 2005
- Location
- Raleigh, NC
I'm not familiar with a 350 that came with a 231 behind it. To mount a 231 to a 350, there is likely a tailcone spacer/adapter. Did you remove this spacer?
How far does the output extend? Also, what did your 203 come out of? It needs to be 27 spline to match the 350.
This was from offroaddesign.com and pertains to doublers, but maybe helpful for you:
GM TH350 Automatic Transmission:
The TH350 transmission is very common and was coupled to the NP203 in MANY GM trucks. The TH350 transmission will need a 27 spline output shaft that sticks out of the case by about 7/8". This output configuration was used with NP203 and NP205 transfer cases. The NP203 will need the 27 spline input gear to match the 27 spline shaft. This input is only found on 203's that came with a TH350 originally. The adapter between the transmission and NP203 is a 1" thick plate with a mounting foot to secure it to the vehicle's crossmember. This adapter plate was only used on factory TH350 to NP203 applications.
A less popular auxillary method of attaching the NP203 to the TH350 is to use the TH350 with a longer output that was originally used with an NP208. You will use the 27 spline input in the NP203 to mate to this shaft and use the TH350 to NP208 adapter housing. This requires drilling and tapping new holes in the front of the NP203 to bolt it up in place of the NP208, and may require very minor machine work on the NP203 input bearing retainer. The drawback of the second technique mentioned here is that the factory TH350 to NP208 adapter housing is about 2.5" thick so your overall drivetrain length will be longer than using the factory 1" plate.
How far does the output extend? Also, what did your 203 come out of? It needs to be 27 spline to match the 350.
This was from offroaddesign.com and pertains to doublers, but maybe helpful for you:
GM TH350 Automatic Transmission:
The TH350 transmission is very common and was coupled to the NP203 in MANY GM trucks. The TH350 transmission will need a 27 spline output shaft that sticks out of the case by about 7/8". This output configuration was used with NP203 and NP205 transfer cases. The NP203 will need the 27 spline input gear to match the 27 spline shaft. This input is only found on 203's that came with a TH350 originally. The adapter between the transmission and NP203 is a 1" thick plate with a mounting foot to secure it to the vehicle's crossmember. This adapter plate was only used on factory TH350 to NP203 applications.
A less popular auxillary method of attaching the NP203 to the TH350 is to use the TH350 with a longer output that was originally used with an NP208. You will use the 27 spline input in the NP203 to mate to this shaft and use the TH350 to NP208 adapter housing. This requires drilling and tapping new holes in the front of the NP203 to bolt it up in place of the NP208, and may require very minor machine work on the NP203 input bearing retainer. The drawback of the second technique mentioned here is that the factory TH350 to NP208 adapter housing is about 2.5" thick so your overall drivetrain length will be longer than using the factory 1" plate.
BigWheelBob
Well-Known Member
- Joined
- Mar 31, 2005
- Location
- hubert,n.c.
If you have the A/A 2 1/2" adaptor, you have the proper output shaft. If you have the thin Cherokee adaptor, you wouldnt have the proper shaft, because they use a adaptor shaft, 21, or 23 spline for the Jeep 231's. Also, if the 350 trans was adapted to a 231 Chevy t-case, you wouldnt have the proper shaft either. I would say if you have to take the trans to a shop in your area to get the shaft changed out, it would be in the 150.00 to 250.00 range, maybe higher if your trans isnt in good shape.