I finally found a NP149 transfer case.
I’ve been looking for a NP149 transfer case to swap into my Silverado. The NP149 came in Silverado SS’s, Denali’s and Escalade’s. It’s certainly not rare, but is somewhat uncommon.
Here are some pictures of the transfer case.
Adapting a 4L80E to NP149
Alright, so I want to run a 4L80E transmission and a NP149 transfer case. The 4L80E is a much stronger transmission and the NP149 is an AWD transfer case.
The 4L80E came in 3/4 ton and up trucks for many, many years. The NP149 came in the Silverado SS, Cadillac Escalade, and Yukon Denali.
Unfortunately, none of the trucks that had the 4L80E came with a NP149. So there are two different ways to overcome this. You can either turn down the output shaft on the transmission or replace the input shaft on the transfer case.
I plan on replacing the input shaft.
Reason being, is that the turned down output shaft is prone to failure in high horsepower applications. The transfer case input shaft, on the other hand, has proven to take the abuse of over 1200 horsepower!
These adapters are for sale by a fellow named time2kill on SilveradoSS.com.
You gotta start somewhere. How about a little backstory and the plan for Charlie?
Okay, you’ve gotta start somewhere. I bought my 2000 Silverado in the fall of 2010. About 3 years ago I had a 2002 Silverado. I traded it off with the the big gas mileage hike and got a SRT-4. A year later, I started carpooling. The SRT-4 was so loud, that I convinced myself that I needed something quieter. A friend of mine suggested taking a look at Volvos. I ended up with a S40 T5 AWD. I loved the car, but quickly found out that it costs quite a great deal of money to mod a Volvo. The S40 was simply stuck at factory settings. About a year after I bought the Volvo, I realized that my family could really use a truck and quite honestly, I missed my Chevy.
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Project "Charlie Murphy" 