Turbo 4x4 Transmission - how do I know ?

[enaberif]

I know for a FACT my TH350 does not have the cast dust shield and only has the flimsy tin one. But again most of the TH350s I've ever seen only had the flimsy tin one and I've never seen any with the cast.

[1967KaiserM715]

I may have spouted a bit of misinformation about the HD stamp, that should only be for the th400, as for the K on that 350 I don't know definite but a quick Google search shows the K cases were indeed truck cases, although I didn't see anything that said it was 4wd specific, or dust covers for that matter. I know for the 700R4's it was the later cases marked, '87 to the start of 4l60's I think


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[koolray09]

Very interesting! What are the numbers/letters on either the governor cover or the round cover on the passenger side.

The transmission is not with me...those are pictures sent to me by current owner.

[koolray09]

maybe i never paid that much attention to my th350s about the k lol. but it shouldnt be a 32 spline and if it is you will need to get an adapter to mate your t case to the new trans output shaft.

The transmission was removed from a running/driving truck.  I ran across the ad for the tranny some weeks ago and did some research on the "K" marked cases, I remember reading something about them having a 32 spline out put shaft, and that this was more desirable.  I have tried to locate that website again and have been unable to do so.

I have been told by a transmission tech that it is possible they put the output spline from a 700 into this case to marry it up to a transfer case with 32 spline.

[Irish_Alley]

700r4 is still 27 splines

[Jason S]

Advance Adapters makes a TH-350 32 spline kit (A/A part no.  50-7102), intended when replacing a SM465 mated to an NP208. 

The "K" or "HD" TH-350 case seems to be late 70's-up and may or may not be marked. It would have thicker material in the dust shield area for bolting on a cast dust cover. That dust shield would have bosses to bolt strut rods that tie to the engine mounts.  Information on the earlier 70's TH-350 doesn't indicate this was available.

From the '79 manual shows the location of the strut rods that run from the cast cover to the engine mounts. 


Also from the '79 manual, the brace rods for the transfer case.


And from the '73  manual, the braces used

[Engineer]

My 1977 K10 (6200# GVWR) came factory with a 400SB/TH350/NP203. The torque converter cover was the light weight stamped tin type.

[AZ87V10]

My 1987 V10, also a 6200# GVWR, came from the factory with a 350TBI V8, 700r4/4L60, and NP208. My trans has the strut support rods from the dust cover up to the motor mounts and has what appears to be a cast aluminum torque converter dust cover. It looks very similar to the one that was on my dad's 82 K20 with a TH400.

[koolray09]

apparently the guy cannot count, or he mis-remembered. I Purchased the K style case pictured above and it does NOT have 32 spline. It has the standard 350 spline.  The pump was shot, but the pump and gears in my transmission are in really good shape.  So my transmission guy is gonna use the good parts out of the two transmissions, add rebuild kit and get me a working transmission with torque converter.    The transmission I deinstalled would not go into gear, could be moved forward or reverse in any gear, and I was told the "planetarium" gear, I probably spelled that wrong, is broken on mine.   The K transmission had a good working "P" assembly, but reverse bands were burnt. 

Saturday November 27 I should have my rebuilt transmission in my hand.  Then work to marry to np203 - gasket on order.    Any volunteers to help me reinstall the beastly assembly - it is crazy heavy and unwieldy.   what -  no volunteers ?  Guess I will have to deploy physics and gravity to help me reinstall the unit.  I have a plan.

[LTZ C20]

I have found that it is easier to install the transmission if you pick the truck up and flip it upside down and lay it back down on the cab roof. Then you can pic the trans and t-case up, flip them over, drop them in, bolt then up and pick the truck back up and flip it back onto it's wheels and put all the fluid in and hook up the rest of the stuff. Just make sure you put one of the nice guest bathroom towels on the ground to rest the cab roof on so you don't scratch the paint!

[frotosride]

Never seen it done any other way!

[Engineer]

I have found that it is easier to install the transmission if you pick the truck up and flip it upside down and lay it back down on the cab roof. Then you can pic the trans and t-case up, flip them over, drop them in, bolt then up and pick the truck back up and flip it back onto it's wheels and put all the fluid in and hook up the rest of the stuff. Just make sure you put one of the nice guest bathroom towels on the ground to rest the cab roof on so you don't scratch the paint!

I used to do it that way but I got tired of getting all greasy from laying on my belly trying to reach the two bellhousing bolts that are behind the distributor.

[Jrgunn5150]

There is no factory 32 spline TH350. I also wouldn't get too hung up over the case. Like the Disney movies say, it's what's inside that counts. As has been mentioned, you can make a 2wd case 4wd, and vise versa.

[Irish_Alley]

it would be one thing if you broke the bell housing from wheeling but since you burnt it up i wouldnt worry about the t case either

[LTZ C20]

I used to do it that way but I got tired of getting all greasy from laying on my belly trying to reach the two bellhousing bolts that are behind the distributor.
[/quote]

Lol I here ya, there are trade offs to this way. Like filling the trans fluid, the fill tube becomes a drain tube!