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JUMPPR's '75 Blazer-con build

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I think I need to move my engine/trans forward a few inches. The end of the trans is resting on the x-member which leads me to think this. I think if I swap my motor mount adapter plates left<->right it should give me enough forward movement. My 203 case feet should line up with the x-member right? Also, this x-member was under a SM465 originally……are the automatics different?

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Crossmembers are the same, but the flat one is for a early tall tcase adapter, and the "w" crossmember is for the late model short adapter.

Are you leaving the nut spacers between the frame and crossmember?
 
83ChevyK5Blazer said:
Crossmembers are the same, but the flat one is for a early tall tcase adapter, and the "w" crossmember is for the late model short adapter.

Are you leaving the nut spacers between the frame and crossmember?
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Definitely not leaving the nut spacers! If I have to have a spacer I’ll make something a little better than that. It was that way when I picked it up.
 
I’d like to get it moved just a bit forward so the shifters come thru the floor closer to where they’re supposed to be. I’m gonna hoist it all out and swap the engine mounts and see if I can get it moved forward a bit. Plus, I don’t mind having to drill new holes for the x-member to move it back either. I’m not trying to stay stock……just looking for functional.
 
I bought the Tejas motor mounts today. I’m thinking about getting their transmission crossmember also.

I think I’m going to have to cut the floor to clear all the shifters. Has anybody got any firsthand experience with this?

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I think I figured it out…..I’m putting a couple steel spacers in the circled areas and using some longer all-thread on the shifter linkage. This allows the whole shift linkage to move forward about 3” and allows it to come thru the floor without moving the whole drivetrain forward.

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What are you using to space that away? You will probably want to brace and weld it up.

Martin
 
82355 said:
What are you using to space that away? You will probably want to brace and weld it up.

Martin
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I’m using a 1” spacer on these two bolts. In this picture the shifter assembly is actually about 2” forward which interferes with the two top bolts of the transmission side. I was able to move it back an inch and get thru the floor with plenty of room.

I think this was originally a TH400>203/205 triple shift from ORD. I had to modify it a little to fit the new style adapter of the 4l80.

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Drilled the holes for the seats today. I’d originally tried using the original outside front mounting points but that put the seats to snug up against the center console. So I moved em outward about an inch and made 4 new holes for each seat. I’m using 1/2” bolts and plan to run a piece of steel across the bottom of each for reinforcements.

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I finally got around to doing the rear seat mounts. I still have to bolt the rear most mounts down but that should be easy compared to the front. I cut the floor to allow for clearance of the front of the seat frame.

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Yeah I added some 2”x1/4” across the bottom. Seems solid enough and is more than what it came with. There’s 4 mounting points for the rear that I’m planning to span the complete distance with a piece of steel for extra reinforcement.
 
Nice. I have an identical 3rd row seat out of a Suburban I want to install in my Jimmy, but with the eBay 3rd row seat mounts. Still trying to figure out the best way to do it.
 
I was going to use the ones like Merrick sells but they lift the seat up higher than I wanted. I’m going to have a full cage and don’t want to give up any more headroom.
 
Jumppr said:
I was going to use the ones like Merrick sells but they lift the seat up higher than I wanted. I’m going to have a full cage and don’t want to give up any more headroom.
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I was going to use those as well, until I saw the price tag. I can buy a welder and make my own for cheaper.
 
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