Transmission leaking

[4X4green79]

I have a 79 K10 and I just swapped in a 350 from a 94 truck.  I noticed a slight leak in the transmission coming from the linkage that goes in on the drivers side.  Is that an easy fix.  I'm assuming I need to drop the pan, is it just a bushing or o-ring??  Any help please.

[Swims350]

it's an oil seal. Like a timing chain seal, metal around the outside and rubber inside. They make a $40 tool to do the job but you can do it by dropping the pan. I did it on a th350, drop the pan, there's a clip on that rod on the iniside, pop it off, there's a nut on the back end, take it loose, and that let's the whole thing slide out the side of the trans, the linkage inside is hooked on the teeth'd gear looking thing the rod goes thru, might be able to leave it intatc or take it apart, not hard, no tools needed for it, once the rod is out the side you can take a screwdriver and pop the old one out, then drive the new one in with a socket that's a tad smaller then the hole in the side of the trans. Then just reassemble.

[4X4green79]

That doesn't sound too bad, I'll give it a shot...Thanks.  Also, When I pulled the motor, only one bolt was holding the motor, now it has 6, I also found the transmission/transfer case were not bolted in either, does anyone know the correct size bolts to bolt the transfer case to the crossmember??

[Swims350]

man somebody threw it together or should have used loctite or something lol.

[4X4green79]

man somebody threw it together or should have used loctite or something lol.

Yea it was crazy, and the truck was drivable.  The only reason I didn't drive it home is because the rear main seal was leaking real bad.  When I went to put the motor in, I was having trouble getting the motor mounts to sit right on the frame, I kept hitting the trans.  I looked under and realized the trans was not bolted in and had moved forward about 3 inches when I pulled the motor.  I just pushed the trans back and the motor dropped right in. LOL

[Swims350]

with it being that loose I would have yanked it, bolted it to the block and dropped em both in at the same time.

At least yours ainr broke like mine. I had a leak in my 88 that has a th350 in it, come to find out the case is broke right by the side cover on the PS which is the 1-2 accumulator cover.

[4X4green79]

with it being that loose I would have yanked it, bolted it to the block and dropped em both in at the same time.

At least yours ainr broke like mine. I had a leak in my 88 that has a th350 in it, come to find out the case is broke right by the side cover on the PS which is the 1-2 accumulator cover.

That sucks.   I didn't want to pull the trans and transfer case.  I just have to fix that seal and figure out the bolt size to bolt the transfer case to the crossmember.  I've been looking all over and I can't find the bolt size anywhere.  I think I'm just going to buy various bolts and figure it out.  I think it is 1/2 because 3/8 is close, but a little too small

[Swims350]

forgot about it being 4x4 lol. I also forgot you had an older 4x4. I just bought some 1/2 bolts from lowes for the rear bumper brackets on my 88, and they are 1/2 and I thought man those are too big for that, but the older ones used bigger bolts. I think my 88 is like the 84 2wd and the 85 monte carlo and used like a 3/8 or so in it cuz it's a 9/16 or 15 mm head. Don't think make 7/16? maybe it's those? Or if that'sa too small has to be 1/2. Buy a couple of each, like cheapies from lowes or hardware store, or maybe just one, find out the size, then buy ya some good automotive bolts from napa or somewhere so they are strong bolts and won't break on you. I aint sure if they need to be hardened or grade 8's maybe grade 5?

[4X4green79]

Thats what I'm gonna do.  Thanks for all your help.  Hopefully Friday morning I'll have time to work on it.  I'll post the size bolts.  On a 2wd the bolts go through the crossmember into the trans.  On 4wd they go into the transfer case.  Its 3/8 on the trans, but the transfer case uses largers bolts, 7/16 or 1/2.  I think 1/2 because the 3/8 bolts slid right in without have to screw the bolt.

[Swims350]

yours got the 2 little pads that sit on the crossmember and then bolt goes threw them? One on each side, or is it the ones like the 86 or so trucks have where it bolts up into the mount which is one long one with 2 bolts then 2 bolts into the t-case to mount the t-case mount/adapter?

The 208 t-case 86 we had, used the long mount into the adapter between the case and trans. The 203 case and th400 we got had the 2 little pads that mounted to the crossmember and went into the t-case.

[4X4green79]

yours got the 2 little pads that sit on the crossmember and then bolt goes threw them? One on each side, or is it the ones like the 86 or so trucks have where it bolts up into the mount which is one long one with 2 bolts then 2 bolts into the t-case to mount the t-case mount/adapter?

The 208 t-case 86 we had, used the long mount into the adapter between the case and trans. The 203 case and th400 we got had the 2 little pads that mounted to the crossmember and went into the t-case.

Mine has the two pads that sit under the transfer case above the crossmember.  Then two rubber pads go under the crossmember and a bolt goes through each (2 bolts total) through the pads and crossmember into the transfer case

[Grim 82]

I will try to check that bolt size tonight. I just removed an SM465/np208 with the flat crossmember and mounts like you described. I left it all bolted together so I will spin one of those bolts out and measure it. I'm pretty sure they are 1/2 by 3", maybe 3 1/2".

[4X4green79]

I will try to check that bolt size tonight. I just removed an SM465/np208 with the flat crossmember and mounts like you described. I left it all bolted together so I will spin one of those bolts out and measure it. I'm pretty sure they are 1/2 by 3", maybe 3 1/2".

Thanks alot you'll save me a headache!!

[Grim 82]

Just took one out; it's 1/2-13 NC with 3 3/4" of thread, but they protrude slightly through the adapter. 1/2"x3 1/2" or 4" should work fine. Get a grade 5 at least or grade 8 if you can.

[4X4green79]

Just took one out; it's 1/2-13 NC with 3 3/4" of thread, but they protrude slightly through the adapter. 1/2"x3 1/2" or 4" should work fine. Get a grade 5 at least or grade 8 if you can.

Thanks, I haven't been able to get that info anywhere.