TH400 to 3-4 Speed???

[1FaastC10]

mine is in the process, all i have to do is cut the hole in the floor under the bolt in hump, and slide the trans and transfer case in. i went with a factory hydraulic clutch setup, but it was a PITA to find it.

[badone07]

Originally Posted by 1FaastC10

mine is in the process, all i have to do is cut the hole in the floor under the bolt in hump, and slide the trans and transfer case in. i went with a factory hydraulic clutch setup, but it was a PITA to find it.

The bolt-in tunnel for a k series or converting to 4x4. Not for a c series 2wd. 67chevemall is doing a c-20.

I'm going to look around tomorrow in a junkyard for a stock hydraulic setup, while looking for something else. I'll bring a tape as well. They are are lifted off the ground. Can't crawl around on the ground just yet. Which all will depend on the weather.

[badone07]

Sorry 67 chevemall couldn't get the info today. My day got screwed up beyond my control.
http://207.44.196.117/vboard/showthread.php3?t=138300

[u2slow]

Originally Posted by badone07

The bolt-in tunnel for a k series or converting to 4x4. Not for a c series 2wd. 67chevemall is doing a c-20.

Not quite. I have a tunnel from a '78 c20 4-spd truck. I took it out myself. The tower on the top of the SM465 is quite tall. You would be putting a *large* hole in the tunnel of a low-hump cab to make it fit

[badone07]

Originally Posted by u2slow

Not quite. I have a tunnel from a '78 c20 4-spd truck. I took it out myself. The tower on the top of the SM465 is quite tall. You would be putting a *large* hole in the tunnel of a low-hump cab to make it fit

I've owned 2 (1 presently) and know of 3 other c-series that came stock with the sm465, factory boot and the low tunnel. I've also seen them the same in a few fairly large junkyards. Not doubting your truck but I'll look check for others like it this weekend.

[u2slow]

I should mention that around 81-82 they eliminated the removable tunnel, but still carried on with a high and low hump profile. I have trucks with all three types.

I'll see if I can get a pic of that '78 tunnel posted tonight.

[u2slow]

The '78 2wd SM465 tunnel:



The 81/82-up "high hump" on SM465 or 4wd trucks.

[badone07]

Thanks for posting the pics. I was interested in the humps in the past but only converted from manual to auto. Wonder if Suburbans were/are similar. I'm still going to look at others over the weekend, while they are sitting there. Below is my 84 with boot and without. Looks lower than your linked 4wd hump, by boots height and positioning.
Yes, I know I have a hose clamp on it. Had a problem with the roll pins working loose.