02AWDAWSDenali

I had to have my 149 rebuilt this summer but it was completely my fault. 4 years ago I popped a tire showing off (like a normal 16 year old idiot) and was in a tight spot for money, so I just got two tires and put them on the rear.... Only problem is they were bigger than the front. Couldn't figure out for the life of me why the driveshafts kept locking up on me. After two years of this massive mistake, I realized what was happening and bought a new set of 4 tires. No more problems. I noticed a giant puddle of tranny fluid under the truck a yearish later and they said it had a hole so they patched it and I ran it for another year. I should've broken something with a couple of months, but the 149 is basically bulletproof it ran different tires for 2 years of 30-40 miles of driving daily. It still worked perfectly, but it had a leak for a while and I didn't realize it was low on fluid so the low fluid caused a ton of wear on all the internals and it had to be replaced. Long story short... 149 is the only way to go with awd.

1bad2k

iTrader: (11)

^^^living proof lol. Glad I stock piled a cpl of those transfer cases!

03sierraslt

iTrader: (22)

I got another vote for the 149. That's what's in mine also.

TURBHOE

iTrader: (4)

I liked the 149 case until I **** the coupler. I think it was abused before I got it. the coupler isn't cheap, I'm still looking for one less than $500!

but it is way more seamless than the BorgWarner open diff cases. my stock one turns all the tires but tends to do front wheel burn outs pretty good before the computer takes over and brakes the tires. but this causes loads of torque steer. more so than normal because of the brakes swapping side to side as the tires let loose side to side. now that it spins all 4 I have less torque steer.

the 246 case is strong as long as you don't autotrac under power. the clutches don't full on engage with rear slippage so it causes them to burn up. in 4WD they are at full squeeze so less likely to slip.

smokeshow

iTrader: (16)

There's a guy here that doesn't post much, joeyc125 that runs in auto mode with his turbo 6.0 rcsb. He says he uses it for 4wd drifting I don't know how long it lasted or if he still does that but for a while he didn't have any problems. Not that I'd be trying it lol.

mikeyjm1

I'm tossing in my vote for the 149.
I swapped mine in with supposedly under 100k on it but really no way to know. I beat the hell out of it in a heavy truck and it just takes it. Lowering and doing the front coilovers stopped the front wheel burn outs and shift chirps. Now it just always sticks, even in bad rain.

Three6GMC

iTrader: (11)

Nice got the info I wanted... Now as far as the NP-149 goes what are the options for it as far as upgrades?