Which tranny should i run?

[1973 Chevy]

That's where being in high school for the next two years is good. They have all of that precision measurement stuff and I can use it all for free.

 

[Driver4r]

That's where being in high school for the next two years is good. They have all of that precision measurement stuff and I can use it all for free.

I agree about school having the tools, but my school is a crock of ****, they make us fill out a forum if we want us to pull our vehicle into the shop.

 

[HotRodPC]

I agree about school having the tools, but my school is a crock of ****, they make us fill out a forum if we want us to pull our vehicle into the shop.

I'd say that's pretty standard. I'm sure it's for Hold Harmless and Release of Liability. At our high shcool as a kid, if a student knew a relative, friend or neighbor who wanted their car worked on for basically the cost of the parts, they also had to sign a wavier stating they are aware it's students working on the vehicle and if something goes wrong ..... Schools can't risk being held liable.

 

[1973 Chevy]

My school is a lot different, we have to sign liability sheets for every shop class. Your actually required to bring in your own stuff for a couple of classes, we have maybe 350 high schoolers all together but you'll see vehicles up on the car lift quite a bit.

 

[bucket]

We didn't have to sign any papers, just have the instructor's approval. I used to pull my car into the shop during winter just to wash it.

 

[Driver4r]

The forum is a new thing to my school, our highschool is a fairly new building. Our old MS got takken out in a tornader in the late 90's, now the old HS is the MS. They got rid of the machine shop and autos garge at the old HS, the New HS only has 1 separate building, It houses woods/welding/ and autos. Honstly the new schools just a pile.

 

[HotRodPC]

Unless our HS changed, we subbed all those trade classes out to the Vo Tech, so students were actually going to class with adults too. You had to be a Junior or Senior, and there 2 classes a day and the students were bussed to the Vo-tech 5 minutes away. It actually worked real well because with the lower volume of high school students per class, and adults in the class, the clowing around was next to none. Not to mention, the kids thought they were the **** getting to go to adult school, so they acted like it was a privelage and were well behaved. Another stipulation, you have to have a 3.0 GPA to be able to do the Vo Tech classes.

 

[bucket]

Unless our HS changed, we subbed all those trade classes out to the Vo Tech, so students were actually going to class with adults too. You had to be a Junior or Senior, and there 2 classes a day and the students were bussed to the Vo-tech 5 minutes away. It actually worked real well because with the lower volume of high school students per class, and adults in the class, the clowing around was next to none. Not to mention, the kids thought they were the **** getting to go to adult school, so they acted like it was a privelage and were well behaved. Another stipulation, you have to have a 3.0 GPA to be able to do the Vo Tech classes.

My HS didn't actually have the class either. There's a local tech school for juniors and seniors of 5 or 6 different school districts in the area. It was a full day type thing with regular classes too, so the students never actually went to their home school. Except for a few of us that went to our home school for regular classes and then drove ourselves to the tech school everyday for the lab class. I don't remember why I did it that way, but it was a lot of fun.

 

[Chevyguy]

I would go with a TH-400 3-speed auto if you can find one. I've got one bolted up to my NP-208 and it works great. I've also got 4.10's in the Diff's. Keep an eye out for ready to bolt in axle assembly's from your favorite wrecking yard. Swapping them your stuff will cut down on your cost.

Clayton

 

[1973 Chevy]

What is the difference between the th350 and th400?

 

[HotRodPC]

What is the difference between the th350 and th400?

Th 400 is stronger, considered brute strength, just about bullet proof and with a few mods is considered bullet proof. Is a bit heavier than the Th350, absorbs about 12 more hp than the Th350, has a bit crappier first gear than Th350. Uses 32 spline output shaft. Comes in 2 different tailshaft variations + 4wd options. Th400 uses A Vacuum Modulator and a Governor to determine Shift points. An Electric solenoid switch for kickdown downshift passing gear and does not have a TV/Detent Cable.

Th350 considered moderate strength, comes in both non lock up and lock up converter variations. Uses the ever so so common 27 spline output shaft as does 700r4, Powerglide, Most Saginaw and Muncie manuals and more. Comes in 3 different tailshaft length variations + 4wd options. Th350 detemines shift pints by Vacuum Modulator, Governor AND Detent Cable (referred to as TV now days but is incorrect name). Kickdown passing gear determined by the Detent Cable, No electronic solenoids except those models with Lock Up converter that is electronically controlled either by vacuum switch or ECM.

Both are 3 speed Non Overdrive units. Both can share the same Torque Converter (NON Lock Up)

 

[HotRodPC]

I would go with a TH-400 3-speed auto if you can find one. I've got one bolted up to my NP-208 and it works great. I've also got 4.10's in the Diff's. Keep an eye out for ready to bolt in axle assembly's from your favorite wrecking yard. Swapping them your stuff will cut down on your cost.

Clayton

He'd likely have better luck finding a Th400 with an NP205 transfer case, much more common than the Th400/NP208, and would be in the race track pattern NP205 since the Circle Pattern NP205 and TH400 is even more rare than the Th400/NP208. Not saying they're not out there, but I see many many more Th400/NP205 combo's for sale than I do Th400/NP208 combos.

I myself, prefer a Th350 over a Th400, and even in a 4x4 model. The only advantage IMO to a Th400 is nothing more than strength. Past that, The Th350 has all the other advantages, better first gear, lighter weight, much more common and so easy to find including adapters and Tcases, Less hp loss at the output shaft, and shift points and shift quality is much more tuneable using the Detent Cable. Th350 has the same longevity of the Th400, but there's 2 things in the Th350 that although not required, but if you intend to be abusive to the transmission, I'd beef up the intermediate roller clutch and race to a sprag and hardened race, and a hardened input shaft. With those 2 mods, I'd say you're going to be very close to the OE strength of a Th400 as far as failures are concerned. The Th400 will still be stronger, but the Th350 is strong enough, unless you're over 500hp/500ft lbs, will hold up just fine with these 2 mods.

 

[bucket]

He'd likely have better luck finding a Th400 with an NP205 transfer case, much more common than the Th400/NP208, and would be in the race track pattern NP205 since the Circle Pattern NP205 and TH400 is even more rare than the Th400/NP208. Not saying they're not out there, but I see many many more Th400/NP205 combo's for sale than I do Th400/NP208 combos.

The th400/np205 combo is only more likely to be found FOR SALE. The th400/np208 is far more common, but really has no value so people don't bother trying to sell them. The th400/np205 is high-dollar.

 

[HotRodPC]

The th400/np205 combo is only more likely to be found FOR SALE. The th400/np208 is far more common, but really has no value so people don't bother trying to sell them. The th400/np205 is high-dollar.

Yeah, you're right. I should have clarified that. I see the Th400/NP205 all the time for sale. $250-$300 for that isn't high dollar IMO. I do see some trying to get $500-$600 and I'd say they rarely get that much.

 

[bucket]

Yeah, you're right. I should have clarified that. I see the Th400/NP205 all the time for sale. $250-$300 for that isn't high dollar IMO. I do see some trying to get $500-$600 and I'd say they rarely get that much.

That combo here sells for $500-$800, more if one or the both have been gone through. All the K30's around here were plow trucks that rotted away years ago, so there isn't much around here to keep the prices reasonable.