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Username Post: are all 1988 to 1998 cabs the same        (Topic#369096)
DougMN 
Senior Member
Posts: 243

Loc: stillwater,mn
Reg: 10-17-02
08-01-22 05:28 PM - Post#2845299    

i have a 1998 k3500 4x4 regular 2 dr. will a 1990 2 wheel drive cab fit,thanks

DougMN


 
CowboyTrukr 
"11th Year" Silver Supporting Member
Posts: 4796
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
08-01-22 09:16 PM - Post#2845334    
    In response to DougMN

Yes.

Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
rockfangd 
"9th Year" Gold Supporting Member
Posts: 3207
rockfangd
Age: 36
Loc: Utica ny
Reg: 04-13-10
08-02-22 08:02 PM - Post#2845367    
    In response to CowboyTrukr

Yes for the most part. You will see subtle differences between the years but still swappable.
The biggest snag I see you running into is the electrical plug on the passenger side.
88-91 had one style plug. It changed completely in 1992, and maybe again in 95 with the interior redesign.
You will have to find a way to make it work as they are not even close in comparison

Old School GM fan FOREVER


 
junkman104 
Frequent Contributor
Posts: 1554
junkman104
Age: 63
Loc: Murphy N.C.
Reg: 01-25-14
08-03-22 05:29 AM - Post#2845380    
    In response to rockfangd

Agreed, the steering column area is different. Changed 3 times through the years.



 
someotherguy 
Senior Moderator
Posts: 29600
someotherguy
Loc: Texas
Reg: 08-01-03
08-03-22 10:23 AM - Post#2845390    
    In response to junkman104

A lot of things changed. You can make it work but it depends on how much work you feel like doing.

The steering column support changed for 1995's interior redesign. You can swap the steering column supports but it does require drilling out several spot welds and then you can either weld or bolt the swapped support back in. Be sure to use locking fasteners or thread locker so that the bolts can't work their way loose later.

The holes in the firewall where the passenger side of the harness comes through changed in 1991. The driver side harness hole changed in 1995 or 1996; can't recall as 1995 has a lot of one-year differences, but suffice it to say your 1998 and 1990 cabs are different on both sides of the firewall where the harness passes through. The driver side is easy to enlarge the hole to the correct size/shape but the passenger side is completely different so you'll be doing some hacking there.

If you intend on using your 1998 doors on the 1990 cab, technically they do fit, but you may find that the variation due to stamping die wear may end up with doors that don't fit as well as you would like. Sometimes you can get them fitting better with a little bit of tweaking, sometimes it simply won't work out.

So, if your 1998 doors don't fit well and you decide to use the 1990 doors, you'll need to make some slight mods to the inner skin where the interior handle fits, so that the inner door skin w/the window motor etc. attaches. You need those inner skins for your 1998 interior door panels to work. Oh, and your 1998 exterior door handles will not fit the 1990 doors. Varies a little bit but around 1995-1996 the door handles changed several times and the opening in the sheetmetal had to get slightly larger to support the changes.

If the 1990 cab is a manual window truck and 1998 is power, you may find that the A-pillars lack the hole for the door wiring and associated rubber boot. Make templates from the 1998 cab to properly locate the hole and cut it out with a hole saw. I even found this issue with a manual window 1994 cab.

Finally if your 1998 is a manual transmission truck you'll have some difficulty getting the master cylinder for the clutch to fit the 1990 cab firewall. The newer style clutch master sits in a stepped hole in layers of sheetmetal on the firewall, and uses the two different diameters of holes to rest on as you clock it into place. The earlier style clutch master simply bolts in with a single size hole. It can be done but you'll have to do some basic engineering to adapt.

LOL another little detail I managed to forget; 1994-up has 3 holes punched in rear of cab roof for the CHMSL/cargo lights. 1990 could be optioned with a cargo light but it's a different setup, and most of them have nothing at all back there.

Bottom line? Yeah it'll work, but you'd be WAY better off getting a cab closer to model year of what you're swapping with; 1996-up would be the easiest by far.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
1983G20Van 
Super Senior Member
Posts: 3969

Loc: Hurst, Texas, USA
Reg: 11-13-02
08-03-22 11:07 AM - Post#2845391    
    In response to someotherguy

The cab floor is also different on the Vortec years to make room for the upstream passenger 02 sensor. I swapped a L31 into a 91 and ended up going with long tubes to eliminate the clearence issue with the newer factory exhaust I found.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 08-03-22 11:08 AM. Reason for edit: No reason given.

 
rockfangd 
"9th Year" Gold Supporting Member
Posts: 3207
rockfangd
Age: 36
Loc: Utica ny
Reg: 04-13-10
08-03-22 06:45 PM - Post#2845409    
    In response to 1983G20Van

Lol I knew that post was from you Richard.
I swapped a 93 to a 90 with a 91 Instrument cluster.
I know in 95 alot changed. Whole new interior, airbag(s) so much.
And I forgot about the floor for the sensor. There was a way around that iirc.

Old School GM fan FOREVER


 
someotherguy 
Senior Moderator
Posts: 29600
someotherguy
Loc: Texas
Reg: 08-01-03
08-03-22 09:25 PM - Post#2845412    
    In response to rockfangd

  • rockfangd Said:
Lol I knew that post was from you Richard.
I swapped a 93 to a 90 with a 91 Instrument cluster.
I know in 95 alot changed. Whole new interior, airbag(s) so much.
And I forgot about the floor for the sensor. There was a way around that iirc.


So much changes across the life of the GMT400 design it's impossible to keep it all in the front of my mind.

Example? I keep remembering other details, even ones that should be no-brainers. For 1995-up they made an oval-shaped hole in the driver floorboard for the shifter cable grommet to attach. Again no biggie to retrofit to an older cab, if you have an auto transmission, just make a template and get to cutting, but adds to the list of "how much work do you want to do?"

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
Keith Seymore 
Contributor
Posts: 771
Keith Seymore
Loc: Southeast Michigan
Reg: 09-17-08
08-04-22 06:00 AM - Post#2845424    
    In response to DougMN



What about the cab floor?

Going back to my squarebody days the 4WD versions had a "high hump" and column shifted 2wd had a "low hump" floor.

I don't recall if GMT400 versions were the same way or not.

K


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