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  1. K

    Frame Differences 350L 350M

    I brought home a K20 frame today from the mid 80s and when I checked the PNs for the frame rails I found that they are for 85-87 trucks with 350L engine (maybe others as well). I also noticed in the parts book that there were different frame rails for 85-87 trucks with 350M engines. What would...
  2. K

    373 Gear ID Help

    Should have been clearer. I've got 4.10 gearing in the axle right now and want to switch to 3.73. So just looking at a gear set to swap into the axle. I'll take a look at the link you provided.
  3. K

    373 Gear ID Help

    I've found a 3.73 GM gear set that I'm hoping will work for my 14-bolt full float rear axle. Axle is on a 75 frame but not sure if it's original. Anyway, ring gear has 3992484 11 41 stamped on it. I'm pretty sure that this will work, but wanted to check with you experts before buying. Let me...
  4. K

    Exhaust Question

    Sorry for delay in responding...busy around the farm. Here's the crossmember that I'm planning on using. Looks to be like the second photo that was posted.
  5. K

    Exhaust Question

    Thanks for the replies. The '75 frame currently has the flat crossmember as is shown in the posted photos; it came with TH350 and NP203. I have the newer crossmember for the NP208 and was going to use that with the TH400/NP208 combo. Does that mean a newer exhaust setup would work front to back?
  6. K

    Exhaust Question

    Might be dumb questions, but when I complete my project I will have the cab and front sheet metal from an 83 GMC on a 1975 3/4 ton 4WD frame. 350 V8, stock manifolds, TH400, NP208. I've been looking at what Heartthrob Exhaust sells and they have sets for 1973-1980 4WD 3/4 tons and wondering if...
  7. K

    Dana 44 Flat Top Value

    Thanks all for the comments. My understanding is that off-roaders can use the flat-top knuckles to set up crossover steering...something like that. I just know that they have a little more resale value than a later Dana or the GM 10-bolt front axle.
  8. K

    Dana 44 Flat Top Value

    Not sure if this is the right place to post, but I've got a Dana 44 front axle with flat top knuckles to get rid of and looking for approximate value. I'm in midwest (wisconsin) and looking to sell it locally. It's from a 1975 3/4 ton and has 4.10 gearing. I was thinking around $250...don't want...
  9. K

    OEM Cab Marker/Clearance Lights

    Thanks for the reply. What is cheap? Are we talking $25 or $100 for an original set.
  10. K

    OEM Cab Marker/Clearance Lights

    Have two sets of original cab marker/clearance lights for sale. Both came off of 1987 Chevy trucks. Set 1: Lenses and gaskets in very good shape, no cracks in lenses. Gaskets good with no cracks. Harness uncut and working. Mounting screws included but cab had threaded holes. Set 2: Lenses and...
  11. K

    Limited Slip Carrier Question

    Replying to this with a follow up question. Found a 10 bolt posi, 3.73 gearing from an 84 Chevy van that's available. Provided it's a pre 88 axle, this should be an 8.5 ring gear and fit in any other 10 bolt axle, front or rear, correct?
  12. K

    Rebuild Kit Questions

    My previous post on trans/transfer case combinations feeds into this question...who makes good OEM rebuild kits for the TH400 and NP208? I see countless different ones online, and at this point don't which manufacturer is any good or if there really is any difference between suppliers. Also...
  13. K

    NP203 and TH400

    Thanks for the input, and will most likely stick with the original plan of using the TH400/NP208 combo.
  14. K

    Looking for TBI Expert Input

    Got an 87 350 TBI that I want to get running to use around the farm while working on my 83 project. I know little about TBI systems, so looking for some help with the current situation: - Engine starts but idles rough. - Runs better at faster speeds - No check engine light - New spark plugs...
  15. K

    NP203 and TH400

    Have 400 and 208 combo. Doing a 4x4 frame swap and frame came with a 203, which got me thinking of going with a full time setup. Just figuring out what works with what. Thanks
  16. K

    2WD to 4x4 conversion?

    When looking at the 7.003 section in the Chevy parts catalogs, 73-80 had the same frame assembly (or at least replacement assembly) for both 1/2 ton and 3/4 ton trucks. Gets little more confusing for 81 and up trying to decipher the PC info, at least for me. Depending on how fast you want to...
  17. K

    NP203 and TH400

    Thanks. Are there aftermarket suppliers of the parts needed to adapt a 400 to a 203? Or is finding original parts the only option?
  18. K

    Driveline Opinions

    Thanks. I'm assuming that yours was a part-time 4WD setup?
  19. K

    Driveline Opinions

    Provided that all components are healthy and functioning correctly, what are the pros/cons of using a full-time NP203 with limited slip differentials front and rear vs. using a part-time NP208 and front/rear LSD? I've seen gas mileage with the NP203 is an issue, what else?
  20. K

    NP203 and TH400

    OK, thanks. Figured there was a difference just as there is for the NP208s. Are there any differences in the tail piece of TH400, or is it all on the transfer case side? Different adapter, different spline input, etc.
  21. K

    NP203 and TH400

    Right now I have a NP203 mounted to a TH350 in a parts truck. As I consider my project options, would a TH400 that came mated to a NP208 also work on that NP203? Or are there different tail piece and output spline issues between the TH350 and TH400?
  22. K

    TOW HOOKS

    Do the hooks from any newer GM trucks fit the 73-80 frame ends? I've seen some that have a straight mounting end but didn't know if the hole spacing would work.
  23. K

    1970s to 1980s Spring Differences?

    I checked the 75 K25 project frame that I have, and that has 52" springs, 7 leaves. The 87 V20 parts truck I have has 56 inch with 8 leaves (has the C6P option code). My running 83 C2500 has 56 inch springs, and the 85 K10 parts truck has 52 inch. Are the 52 inch, 7 leaf springs similar in...
  24. K

    1970s to 1980s Spring Differences?

    What are the major spring differences that would exist between a 1975 3/4 ton 4x4 frame and a similar 3/4 ton 4x4 frame from the mid 1980s? Shackle or mounting differences? Differences in spring lengths, etc.? Parts catalog lists a ton of different springs through the model years...just...
  25. K

    Gas Tank Differences

    What are the major differences between the standard gas tanks used on 1973-1980 and 1981-1987 trucks? I know the filler necks are different because of gas cap/gas door setups in the bedsides. Are the tanks actually different? I'm putting an 83 bed on a 1975 3/4 ton 4x4 frame and want to know...

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