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  1. HopHead357

    New GM L31 Crate Motor Leaking

    Hello all. Just got my new GM L31 crate motor in my truck and noticed that it is leaking from the rear main seal area. It doesn’t even have any oil yet and there is a small puddle of oil about 2” in diameter. You can see it running down the inspection cover on the bell housing. Definitely coming...
  2. HopHead357

    Replace clutch at 35k miles? Unever wear

    Hello all. About 35k miles ago, I did a NV4500 swap and have had no issues with the clutch or transmission whatsoever. I am now in the process of dropping a new GM crate motor into my truck and have the old motor and transmission. I've inspected the clutch disk and see there is some very slight...
  3. HopHead357

    New Crate L31 Replacement Parts

    Hello All. I am in the process of dropping a new GM crate L31 Vortec motor into my 1999 K1500 4X4 with 215K mile. I've got the old motor out and have gotten it mostly stripped down and have been spending a significant amount of time cleaning 23 years of caked on oil and gunk off things I'm...
  4. HopHead357

    Crate GM L31 Pricing

    Hello All, I've been thinking about replacing my tired L31 in my '99 K1500 w/ NV4500 for some time with a crate GM L31. I first started looking in 2010 when they were like $1700 and again last year when they were $3600. Well, now I've waited too long and they price is around $4400. Now it's...
  5. HopHead357

    A/C Swap? '01 3500HD into '99 K1500

    Hello all, The A/C in my old body 5.7L '99 K1500 ECSB has not worked in may years. sometime around 2008-2009, I took it to a shop and they said it needed to be replaced. At least, that's what I remeber from 10+ years ago. I don't rememner any details of the issue, just that it was going to be...
  6. HopHead357

    Mini Overhaul?

    Hello All, My '99 L31 with 212K seems to be leaking oil out of numerous orifices. I runs fine, just leaks oil. I've been wanting to throw a crate motor since I did my NV4500 swap, but never got around to buying one and now they are a bit out of my price range. Anyways, I'm tired of the oil...
  7. HopHead357

    Camper Shell Compatability

    I've been looking for a few month now for a camper shell for my truck. I finally found one locally, but in the seller's words, "...came off 2007 chevy short bed fits 2004- 2007. 63x81 1/2" Does anyone know or have any experience fitting a camper shell from a new chevy/gmc on their GMT400? I...
  8. HopHead357

    NP243 Won't Go Into 4Lo

    Hello, Back in 2010, I swapped out my junk 4L60E for a NV4500 in my 1999 K1500 ECSB. As I'm sure most of you know, this requires switching the input shaft on the t-case. A buddy and I did this seemingly without issue and finished up the swap. Everything seemed to work fine... except for the...
  9. HopHead357

    Stock Radio W/ Bluetooth

    Has anyone tried one of these? I currently have an alpine radio in my truck, but kind of want to go back to the OEM look and lost my original stock radio in a fire...
  10. HopHead357

    WTB: Warn Hidden Winch Mount - CA

    I’m looking for a Warn hidden winch mound for my ‘98 K1500. I believe it’s model number 22555 which is long out of production. Located in CA.
  11. HopHead357

    West Coast Engines 300hp 5.7L L31

    Does anyone have any experience with this company or engine? I'm going to be replace my engine and want more power. Here in CA, I have to deal with the stupid smog rules and don't want to build an engine only to have it fail a smog test. This seems like a straight forward and affordable way to...
  12. HopHead357

    My truck revs up by itself and stays revved when stopped. Bad IAC valve?

    I have a '99 K1500 5.7L with a NV4500 5 speed manual transmission that I swapped in about 2 years ago. This issue started with the old 4L60E that was in it before. With the 4L60E at about 10mph and 1500rpm, the truck would stay at 1500rpm and continue to drive at 10mph with my foot off the gas...
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