can anyone please help me find what type of transfer case i have in my 2004 chevy blazer? i replaced the encoder motor but it still gridding when trying to go frontwards but the 4x4 works going backward so i think i should replace the transfer case. i see there are a few different types tho and don't want to get the wrong one can somebody help? the help will be great and thanks for your time.

 

we need more info. do you have a 3 button or 4 button switch? where is the grinding sound coming from? the front axle, or the underneath the car?

 

X2. If it was grinding before, and you replaced the t-case, and it's still grinding now, I would look else where for the cause of your grinding.

As far as what case you have, if it's the three button, I think that's the NP233. The four button, I want to say NP236? Might be wrong on that. The manual one on 1st gens was an NP231.

 

It's a 3 button above the radio and its coming from like the middle or back part of tc. Underneath the truck. It works going backwards but it don't do anything but grid going frontwards also want go in 4 hi only low. But I also replaced tccm and still want go in 4 hi any help b great

 

I didn't replace the tc only the tccm and encoder motor

 

Yup, NV233 2 speed selectable electric shift.
1st digit is how many speeds.
2nd digit is how "strong" the case is.
3rd digit: 1=part time 4WD manual shift, 3=part time 4WD electric shift, 6=Electric shift, active on demand, (Auto track).

 

so with the gridding coming from the transfer case and that i have replaced the encoder motor do you think it's the right choice by goin to change the transfer case?

 

If you are certain that's where the noise is coming from, that's where I would look. It might be worth it to pull the case apart and have a peek inside before you drop money on a new one. Maybe it could be repaired?

 

Possibly a stripped sprocket or a stretched chain, or both. If you end up removing the case, take it apart and check it out. They're not that difficult or expensive to rebuild. The transfer case is made by New Venture, it started out in the 70's as a joint business owned by GM & Chrysler, called "New Process". The front & rear adapters are different for each make & model, but the basic case is the same for GM, Chrysler, Dodge, & Jeep. The identification tag on the rear of the case, (on yours) should say "NV233C", indicating it's in a Chevrolet. If that same case was used in a Jeep, it would say "NV233J". Check around at the local boneyards for a 233 case, worst case scenario is you would need to transfer the adapters from your old one.