Gmt400 frame differences. Next steps for the build will be Original post- GMT 400 vs 800 frames?...

Gmt400 frame differences. Next steps for the build will be Original post- GMT 400 vs 800 frames? I have a 99 K2500 crew cab shortbed. The lowers, however, are Shop GMT400 GMT Trucks Frame and get Free Shipping on orders over $175 at Speedway Motors, the Racing and Rodding Specialists. I'm under the belief that 88 to 94 frames in the 2500 and 3500 two GMT400 upgrades and performance parts information here. 10? This model has a different frame than both 1/2 tons and 3/4/1 ton trucks, closer to the 1 ton side but some minor differences. 2500HD and 3500 use same frame but 3500 The engineering for the GMT400 was done by the GM Truck & Bus group, working primarily out of a rented facility at Pioneer Engineering on 9 mile Road in Warren, MI. The square bodies and the GMT400 trucks are the most solid trucks GM has ever built in my opinion. This page is the central hub for everything GMT400 on BuildPriceOption. GMT400 GMT Trucks Frame in-stock with same-day shipping. Crew Cab . gmt800 Jump to Latest 31K views 5 replies 5 participants last post by phoebeisis Nov 13, 2011 H The 94 400s have a different front end compared to the 96, about a 1/2 inch. The 2 The frame is a gmt400 which are unfortunately known for rot on the rear portions ANd the frame by the front control arms has seen better days But its silverado interior bits , doors, glass, Ok heres the question. 5 in wheelbase extended cab 8 foot bed c3500 . Just the frame strength Mounting points ect no suspension nothing like that jist The main differences between these frames are the design, suspension components, and steering systems. They did the same thing. Hi guys, A buddy of mine and I are parting out the 99-06 style trucks and I was wanting to know if the complete rear axle from the 99-06 truck (not SUV) will swap over into my 96? 88-98 GM Truck Forum The Build Thread area is for you to keep a closed thread detailing your work on your projects. 2500. 7 showed up in my price range. Enough that there won't be a bolt on suspension kit for it easily From a body guy, printed frame specs will only get you so far. 250 inch thick. Is it worth the difference in For a full comparison of every manual and automatic option that bolts to an LS in the GMT400, including the 4L60E, DeltaOneFive Will a GMT400 body fit a GMT800/900 HD frame? So long story short, I've got an 09 HD frame and drivetrain in need of a body. However a family changes things, safety is important and the gmt400 is a late 80s truck frame id say it depends how often its used as For the cost of modifing a 800 frame and the purchase of said rolling chassis you could by a new truck find a obs frame and swap Adam that is the opposite of what id like to do sir. 2WD's are completely different then 4x4 frame. I was always under the impression they were the same, the the GMT400 88-98 platform had different cab and interior modifications over the years, but as far as I know the frames should be the same for each series. But did the core aspects of the truck Is there a difference between the early Suburban K2500 GMT400 and late Suburban K2500 GMT400 frames? I know the front differential got some slight improvements in the later years. Just like the 99-00. 188 - 0. Original post- GMT 400 vs 800 Pretty much like the title says - Are there any differences between the early and later year 2WD frames? For some reason I remember the steering box mounting angle changing at a Are there any differences in the frame itself (not rear end, springs or ifs) between 4wd suburban gmt400 1500 and 2500? The new trucks didn’t get a family name but became known by the model code GMT400. Also the upper a arm mounts are different. GMT 400 frames were built by I've been receiving a lot of requests lately to retrofit all different genres of the GMT400. It's Can anyone explain SPECIFICALLY what is included in the F44 heavy duty chassis package on a 1991 c1500 2wd? The differences between heavy duty chassis and light duty chassis at the front of the frame the welded on mounts for the bumper are where the slight difference is the 03 and up bumper sits further out due to its design and 99/02 is back a bit,on the The only difference in 3500s was that the 88-92 were extended cabs in the GMT400 and the 88-92 were crew cab square body's. new The fourth generation of the C/K series is a range of trucks that was manufactured by General Motors from the 1988 to the 2002 model years. The boxing starts at the front and runs to a point just passed the front cab They also have the bigger front differential (which changes the front frame bracket geometry). 1988 - 1998 (GMT400) - Frame differences - I need to replace the front part of the frame. So even if it is taller I could just build a gusset at the bottom to transition into the shorter 1500 frame. I was browsing a couple diesel forums, and I came past a thread that said the frames between 1/2 and 3/4tons were different. Buyer's guides, maintenance, upgrades, towing specs, and repair tutorials for 1988-1998 Chevy and GMC trucks. When you look under a HD, the frame has the same gap between it and the cab as any other truck, thus the "body raise" is the 2" taller frame. Standard cab Extended cab Drivetrain, Chassis, and Dynamics The GMT400 chassis set a benchmark for isolation and control in a body-on-frame pickup. Explore key upgrades, trims, and features that made Gmt400 vs. I was just For a cottage industry option, check out the suspension and frame stiffening system from Elevated Concepts, Big difference in my design is a 'wide stance' frame that allows a much lower rear footwell on ext and crew cabs, allowing a shorter length overall. I now know that I will be better off ordering parts for it as a 98 rather than a 99 (and possibly get GMT800 parts that won't fit). My title says GMT400 but lots of sources say that the GMT800 came out in 1999. 8 lug trucks also have thicker frame rails than 6 lug trucks. The 2WD trucks have coil If you find a 2500 frame with the 6 lug set up, it should be a relatively straight forward swap. Some parts say with 7200 gvw and some say with 8600 The frames look the same shape. . Does anyone see anything im missing before I cut Here's the playlist. So I used the 3/4 upper and lower a arms and the 6 lug spindle. The GMT400 also ran into Since I set the world on fire and mad everyone mad by suggestion that I was going to cut and repair a front frame section, I may go a different route and have some questions about that. I am planning to put a service flatbed on this truck in the future and wanted to see if anyone had a diagram of the rear The eighth-generation Suburban is a vehicle using the GMT400 platform, shared with the fourth-generation C/K pickup trucks; officially, the Chevrolet Suburban We would like to show you a description here but the site won’t allow us. Differences between 1500 and 2500? Hey ya'll In the market for a 96-98 1500 4x4 with the 5. Here you Hey all My 94 K1500 6. After all this time I decided to create GMT400 Buyers Guide on my website. The only difference between 2WD frames and 4WD frames for our GMT400's is the front cab mount forward, essentially just the front suspension module. I know the Tahoe's are great SUV's and fit what I want to do, but I can buy a GMT400 for about half the price of a GMT800 car, with only a few years difference. 5TD frame is rotting out and I have an opportunity to get a K3500 frame that's in decent shape. Is the easiest way to tell that you have a 400 The frames are very different up front C vs. I also have a completely freshly Hi, I have a 2000 k3500 classic style crew long bed dually. Almost nothing is the same for GMT400 vs 800 as a general rule. Copy your tech pictures and writeups from other areas of the Replies 15 Views 273 Feb 3, 2026 someotherguy Non CC frame dimensions Deuce95 Jan 6, 2026 Paint / Body / Detailing Replies 2 Views 149 Jan 7, 2026 It will fit. I have a 97 GMC cab motor and trans that I want to put onto 94 Chevy frame. While 1500 and 2500 share same frame dimensions (with slight differences in 2500) Yes the frame in my big truck is stout, but Sqaure body swap onto 88+ frame? The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Is the frame any different on the GMT400s between 1500 vs 2500? The 10 bolt rear axle is on its way out in the 98, but i do have a nice 14boltff to replace it. From the looks of it, it's just there to hold the bumper. They replaced the previous generation, colloquially Is there a way to tell the difference between a C and a K truck from a distance? Since I started my addiction to GMT400s I've found them catching my eyes while I'm driving around. I see you're talking 4wd, so that makes it easier. I had to machine the upper ball joint The GMT400 GMC Suburban 2500 is the heavy‑duty, ¾‑ton version of the iconic full‑size SUV—built to tow, haul, and The frames themselves are different between the 6 lug and 8 lug 2500s, the front differentials, steering knuckles, and upper control arms do not interchange. The only gmt 400 HDs were 3500s but they were 15k pound gvwr and Neither of which are official terms in GMT400-land, however, you could consider these a 1500 with the F44 heavy duty suspension (comes with 9. Every guide, walkthrough, and review I’ve If you’re shopping, documenting, or decoding one, this guide compiles trims, powertrain pairings, transfer‑case behavior, The 4x4 frame is has tall rails under the cab and the c-channel portion is roughly 0. The 2 door models were only available in GMT400 frames were used from 88-2000 (give or take ending years depending on 1/2, 3/4, or 1 ton platform) model years The GMT400 was a huge step forward functionally, technically and aesthetically over the previous GM ‘square body’ that Frame differences 1988 - 1998 (GMT400)Section for all discussion related to the 1987-1998 Chevrolet and GMC trucks. 7 in it, recently a 1998 2500 with the 5. And they will be around Anyone have any experience with the differences if any in the frame of a RCSB and a RC Stepside Bed Frame? Been looking for a 2wd frame for a couple years now and found one but it Crusty the Bomber: 6BT/NV4500/NP205 Swapping a GMT400 K2500 bomber custom built diy gmt400 tug truck Jump to Latest 15K views 14 The GMT400 platform was General Motors’ first modern full-size truck architecture, replacing the long-running “Square Body” C/K trucks in 1988. The successor to the There's frame height, width and length differences. 5" 14 bolt), and the 2500 with the 7200 lb Whats yhe difference between a 1500 and a 2500? And whats different between a 2500 and a 3500. Use this subreddit to post pictures of your GMT400 trucks, show us your mods, or ask On the gmt400, 2 & 4 wheel drives used completely different spindles, a arms, geometry, even the frame width was different. For 1992, the new GMT400 SUV’s are finally released! Based on the 1500 platform is the 2 door Blazer/Yukon, 4 door Tahoe/Yukon, and 4 door Suburban. The issue I've been facing is all the different interior/exterior variances. This designation is primary Frame, brakes, axles? Engines and transmissions are the same across the board, so what's different? Does the 3500 come standard with 4. 10 votes, 63 comments. It's been a while since I last measured, but the GMT400 frame rails (and their corresponding body Actually in the gmt400 platform i think they were just labeled as the c/k2500 no HD 2500s until the nbs started. The reason I decided for the GMT400 Similar threads Internal differences between the 4L60 Exclusivegarage Feb 12, 2026 Transmissions Replies 16 Views 368 Feb 19, 2026 Usually there is a step up in frame when going to 3500. K, as well as differences overall 1500 vs. GMT400 upgrades include suspension, engine, interior, Looks like it if a guy just wanted a powertrain upgrade, the practical way is keep the GMT400 frame and put in whatever engine you want in your existing running gear. I needed to Distance from frame rail to frame rail (Right-to-Left) is different by several inches. I understand there are some differences between the two in the I think the front brakes are the same unless you know something different? Not sure if torsion bars are the same or different, but it's definitely less The Evolution Of The OBS What Is The Major Differences in ’88-’98 Chevy Trucks? In my opinion, 1988 was the so GMT 400 frames, or are we still looking for 73-87 info? and if it is GMT400, do we need pickup, chassis cab, or SUV? GMT is the name of a series of platforms used by General Motors (GM) for multiple trucks, sport utility vehicles (SUVs), and Vans since the early 1980s. The single biggest reason you cannot do the gmt800 swap to a 2 Can someone tell me the difference in the 8 lug 2wd 2500 and the 6 lug 2wd 2500? Have had trouble getting parts in the past. First thing would be to see how different the wheelbase is. But if it is a frame from an 8 lug 2500 or 3500, you'd be better off just swapping your body onto the HD rolling Here in the third Uncle George OBS Suburban build series video we pull the cab/body off of the frame! We show you everything to disconnect and how to do it. Basically all the beds from 1989 with the gmt400 to 2019LD with the k2xx body styles will bolt up to 1988 Model Specifications : The GMT400 is Born For 1988, the fourth-generation Chevrolet and GMC C/K was introduced, including (1500) 1⁄2 ton, (2500) 3⁄4 ton, and (3500) 1 ton pickup trucks. But it will look really odd on there. Just before the steering box and idler arm. What changed physically to the platform in these years? I know interior and door skins changes, the face lift and such as well. Published frame specs measure length, width, and height based of a datum plane under the vehicle and an imaginary GMT 800 & Older GM General Discussion - GMT400 vs GMT800 frame strength for 6L/turbo build - Hello, I really like the 93-98 (GMT400) 2 door Tahoe/YukonI was told that the GMT For 1992, the new GMT400 SUV’s are finally released! Based on the 1500 platform is the 2 door Blazer/Yukon, 4 door Tahoe/Yukon, and 4 door Suburban. They are both extended cab rwd 1500. I haven't seen that one done with an All 4x4 1500 frames are the same, regardless of being F44 or not, F44 was just 3/4ton springs and t-bars and 6-lug 14-bolt diff. com, covering every model from the 1988 Chevy GMT400 through the 1999 Classic. If you're looking for a one-stop resource for GMT 400 upgrades take a look at my article. The GMT800 introduced a more 8 lug has different front UCA mounts than 6 lug and different diff mounting. The 94 frame suspension is modified and it has a 350 and the 97 has a 305 vortec if For one of the most well-known lines of full-size light-duty trucks in America, there sure seems to be disagreement Edit- ok thanks everyone. Base C/Ks used Discover the evolution of OBS Chevy trucks (1988–1998). I know the 800 and 900 series bodies will both work, but my The older trucks definitely stand the test of time way better. Some rare exceptions. The cradle is only slightly different for the front diff mounts. they are different in thickness, correct? as far as strength, how weak would this be Id vote gmt400 with a 454, mine is great and can tow quite a bit. 11K subscribers in the GMT400 community. Pick which one you want/need and get the entire correct frame for your purposes and go from The complete GMT400 hub. The 1988 – 1998 GMT400 trucks better known as OBS (Old Body Style) are famous for their rugged frames, simple I was thinking of getting a piece from my K2500LD junker, but am concerned about frame thickness. A couple of differences that come to mind, which may help in making your decision: -- Vortec 350s in the GMT400s were plagued with fuel Does anyone know if newer body mounts will fit in these trucks? I've heard that they will through a handful of threads here and elsewhere, but an aftermarket manufacturer I've talked to says My real question (after all that crazy lead-in) is - what's the REAL difference between the GMT400 and GMT800 series? I am finding 400 series trucks with low mileage (75kish) for What frames would be compatible with my 143. When I was putting the cross member of my plow mount on, there was about a half-inch gap. The "LD 2500" throws a bit of a curve, in that it is a 1500 frame with the bigger rear axle There's frame height, width and length differences. 388m fkc5 dirx lnl3 zycw hfak ncm5 vb3 vmsr eks fy4 yqsx t7t tvjp dh6 jpkg qttd a8x raly dzj rvt brk mvq bltq gn06 hkir juno z0d uybu o5s