Cab swap?????

[pulltilbroke]

OK I'm gonna be doin a cab swap in the spring and was wondering what differences there are in cabs, my truck is a 90 and I'm gonna be putting an 86 big hump auto cab on.

Are the holes already there for the clutch MC ?

Is there any difference between a Diesel and a gasser cab?

What else should I be aware of before atempting this swap?


I am going to be using my whole wiring harness

This will be my first cab swap with this many wires. "I'm used to workin on mid 60's Chebys"

[Richie O]

On both of my 89's as well as a donor 90 cab I chopped up they had the clutch m/c hole. They just had a rubber plug in it. Have a good time. Pete knows how much fun it is.

[RumbleFish]

i think 86 still had a mechanical clutch. might be wrong though.

[pulltilbroke]

so it sounds like i'm gonna be doin some plasma work

[pulltilbroke]

Can this swap be done in a weekend

[Richie O]

Not sure. Took Pete all winter. I think he had to many Piels, or maybe to many Golden Anniversary's.

[PToombs]

Well, you have a big hump, so that will save you about 3-4 hours.
I put an 86 cab on my 92, and it wasn't fun. I had an auto cab, so I had to swap the hump, and I cut out the firewall on the auto and grafted the clutch area to it. The wire harness plug was about 1/2-1" into where the clutch master came thru. I'm not sure what you have for clutch stuff, hyd or manual. If you need pics of what I cut and welded back in, let me know.
Some day I might get around to finishing my "cab swap" thread on here.
It didn't really take me all winter, it sat under a tarp until about march, then I got motivated. I did a ton of other stuff too, painted the frame, new springs & shocks, etc. I had it sorta done for dyno day in July, then had to take the fenders back off and paint them.

[pulltilbroke]

Some pics would be awesome

[Richie O]

Some pics would be awesome

I don't want to see pictures of his " Big Hump ".

[pulltilbroke]

Yeah I don't want no big hump pics

I just need some firewall pics

[MunK]

pulltilbroke.... bring your good welding eyes on over and we can do my crew cabs firewall any time you like. ;-P

I would imagine a little plasma work and some time with the welder and it should be done.

NoRM

[pulltilbroke]

Sounds good

I gotta slap a new headgasket in my truck before I drive that far.

[Richie O]

When you get your new head gasket in you also need to install a fist on your dash board that is hooked to a boost switch. Anything over 40 psi and you get punched in the nose. That should keep you in line. Its hard to stay out of the power isn't it?

[PToombs]

Original firewall,


The 2 pieces I cut out,


The new older cab, ready to install. Notice the steering support bracket 1/2 in the hole? I did this for more strength, welded both sides.

[PToombs]

On the original I cut oversize 1st, then trimmed down to size. I cut it out with a 4" grinder w/ a cutting wheel, and drilled out the spot welds. Welding near the top was fun, with the seam sealer stuff in there. When I was done, I bedlinered the firewall and the whole inside of the cab. You can't even see the welds.