1 ton crossmember

[ajd89]

Mine is a '79 with the really flat crossmember.

If you are going with the 4L80/241 combo, you will probably need the later wavy or W crossmember. Unless your adapter is from an early th400/np208. The later setups used "short" adapters with the single rubber mounts, which in turn used the non-flat crossmember.

Flater then the one i posted to start with?


Ive got 2 of these guys then....Ill probably have to buy a new adapter cant find one guessing cause everyone wants a 400 in there truck.

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[Honky Kong jr]

Flater then the one i posted to start with?


Ive got 2 of these guys then....Ill probably have to buy a new adapter cant find one guessing cause everyone wants a 400 in there truck.

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They are salty. I got lucky and found someone who didn’t know what they had. I traded the original 350 out of my truck for a 400 208 and the adapter. Sucker lol

 

[ajd89]

I

They are salty. I got lucky and found someone who didn’t know what they had. I traded the original 350 out of my truck for a 400 208 and the adapter. Sucker lol

Ive been looking new is stupid expensive. I need a input shaft for the 241 too. Been hoping to find one with the adapter. Ord wants like 150 for the input shaft!

 

[Honky Kong jr]

I

Ive been looking new is stupid expensive. I need a input shaft for the 241 too. Been hoping to find one with the adapter. Ord wants like 150 for the input shaft!

The case on the one I got in trade was crappy so I swapped the input shaft into the original TC com the truck and traded the case off for a set of new 10 series mufflers.... lol every thing has value to someone.

 

[ajd89]

The case on the one I got in trade was crappy so I swapped the input shaft into the original TC com the truck and traded the case off for a set of new 10 series mufflers.... lol every thing has value to someone.

If that all came together tell me why you had to make that extra spacer again?

 

[Honky Kong jr]

If that all came together tell me why you had to make that extra spacer again?

Because I’m using a fixed yoke 400. The shaft is longer on them. I did a bunch of work to the trans and didn’t want to pull it apart to swap output shafts.

 

[bucket]

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Flater then the one i posted to start with?


Ive got 2 of these guys then....Ill probably have to buy a new adapter cant find one guessing cause everyone wants a 400 in there truck.

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Yep, flatter. Looks like I got a couple bolts that need tended to also.

 

[rpcraft]

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Yep, flatter. Looks like I got a couple bolts that need tended to also.

If yours is flatter than that maybe its a 2wd crossmember with a short foot adapter on it? Someone started trying to do that on my K5 and after replacing the transmission for having a fractured tailhousing I figure it wasn't going to work out to well.

 

[bucket]

If yours is flatter than that maybe its a 2wd crossmember with a short foot adapter on it? Someone started trying to do that on my K5 and after replacing the transmission for having a fractured tailhousing I figure it wasn't going to work out to well.

Mine is the one in the picture. That's the 1-ton version of the flat style crossmember. The 1/2 and 3/4 ton version has ends that curl up more to match the shorter frame rails.

Far as I know, all of the flat crossmembers used a tall style adapter with the twin rubber saddle mounts. The one posted originally in this thread had a plate welded to it, likely for use with a short style adapter and a traditional mount.

 

[bucket]

Also, I think the pre-81 1/2-3/4 crossmember differs from the '81-'84 part a bit. IIRC, the later one has larger mounting tabs for skid plates and stuff.

 

[rpcraft]

Mine is the one in the picture. That's the 1-ton version of the flat style crossmember. The 1/2 and 3/4 ton version has ends that curl up more to match the shorter frame rails.

Far as I know, all of the flat crossmembers used a tall style adapter with the twin rubber saddle mounts. The one posted originally in this thread had a plate welded to it, likely for use with a short style adapter and a traditional mount.

Oddly enough I have that same crossmember and it came off a pre 84 half ton truck rig..... I guess there was a phase where it might have been the go-to crossmember for all the trucks.

 

[bucket]

Oddly enough I have that same crossmember and it came off a pre 84 half ton truck rig..... I guess there was a phase where it might have been the go-to crossmember for all the trucks.

Are you sure it's just like that? The others look similar at a glance.

 

[rpcraft]

Hard to say... Mine does appear to have a little more curve (please ignore the love glove, lol):

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As installed:

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[bucket]

Your first pic there looks like the more curved ends for sure. But the second certainly makes it look flatter.

 

[rpcraft]

If I can get my crap together this weekend I will go out and measure the height... Only other picture I had before I schlepped it in was me in my jammies with the old clapped out mounts. I do know that this "style" was what was in my 77 Jimmy with the TH350 Which is why I knew there was aversion for long foot and short foot mounts.

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