Let's talk about TH400 trans to 4 speed conversions................

.....in 60's-70's GM cars. Now, here's the deal. I believe all these are basically the same length.
GM Saginaw 4 speed w/bellhousing
GM T-10 w/bellhousing
Muncie 4 speed w/bellhousing
Alum Powerglide
Normal (short) tail TH350

Now, I also believe that the shorter of the TH 400's is 2-3 inches longer than all the above when it comes to doing a swap. I met a guy that says the 71-72 Chevelle Muncie is 3/4" longer than older Muncie, and it may be true, BUT, he also says it's enough to make it a DIRECT swap lengthwise with the TH400. What say you? Thanks

 

Comparison of T56 to T5 and traditional four-speed transmission.
<table cellspacing="10"> <tbody> <tr> <td>
</td> <td>A</td> <td>B</td> <td>C</td> <td>D</td> <td>E</td> <td>F</td> </tr> <tr> <td>GM Super T10, Muncie, Saginaw</td> <td>6.3</td> <td>14.2</td> <td>23.0</td> <td>N/A</td> <td>N/A</td> <td>3.75</td> </tr> <tr> <td>GM T5 (V8)</td> <td>6.3</td> <td>16.0</td> <td>25.0</td> <td>19.0</td> <td>21.2</td> <td>3.75</td> </tr> <tr> <td>GM T56 F-car (production)</td> <td>4.9</td> <td>21.0</td> <td>26.4</td> <td>21.1</td> <td>23.9</td> <td>3.75</td> </tr> <tr> <td>GM T56 F-car (aftermarket)1</td> <td>6.3</td> <td>21.5</td> <td>27.0</td> <td>21.6</td> <td>21.6</td> <td>3.75</td> </tr> <tr> <td>Ford T5</td> <td>6.9375</td> <td>14.5</td> <td>24.125</td> <td>N/A</td> <td>N/A</td> <td>5.5</td> </tr> <tr> <td>Ford Top loader</td> <td>6.375</td> <td>13.25</td> <td>24.125</td> <td>N/A</td> <td>N/A</td> <td>5.5</td> </tr> <tr> <td>Mopar 383</td> <td>7.38</td> <td>15.28</td> <td>27.01</td> <td>N/A</td> <td>N/A</td> <td>2 or 2.76</td> </tr> </tbody> </table>
Dimensions B through E include 0.5" thick adapter plate

 

I've swapped around pretty much anything in Chevys and I never ran into a length issue. There is a longer tail TH350, rare though. More common was a longer TH400 that came mainly in station wagons. I have one on the garage floor, PM me if you want a measurement.

As far as my experience goes, I view the PG, short-tail TH350, TH400, Saginaw 3 & 4 speeds and Muncie 4-speeds as the same length. The TH400 yoke was always different, but length wise, they all fell into the factory transmission mounts.

Bob

 

not all muncies share the th400 spline count

 

Me say no to differant Muncie size.

 

Id like some real answers please

 

saginaw 3&4 spd's,M-20,M-21 used 350 turbo yoke where M-22 used 400 turbo yoke.

 

Not all M-22's used the bigger output shaft/yoke
Not all M-22's had fine spline input
Not all M-22's had a drain plug

But, that's not what this thread's about anyways. It's about trans length

 

me too

 

my experience..... you take out th350,and put in th400. It ALWAYS involves a trip to the driveline shop!!!!!

 

Then get under the car with a fricken tape measure. sheesh

 

I already have. I have a 400 in my car with the shortest tail and it's at least 2 inches longer than all my trans that I list in my first post. I wanted to hear from others after than line of **** I was fed at Pomona swap meet. The only way that swap will possibly work is if the yoke is too deep in one trans and too shallow in the other. sheesh

 

If you're going to swap, consider finding an NP440 (chevy version of the A833 OD)

http://www.hemmings.com/mus/stories/2005/03/01/hmn_feature17.html

 

the answer is yes in most cases but there are a few exceptions depending on what th400 you have and what muncie you get, but those are the oddball exceptions

if you used my m-22 it would bolt in but the output spline would not match up because it doesn't have the th400 spline, it's a 69 version

 

Wow, impressive chart.

 

Im not a xpert.
Th350=muncie (4 and long 3 speeds) saginaws and borg warner
TH400=nothing witout moving stuff and drive shaft made longer or motor moved back.
TH350 yolk= most muncie, borg warner and saginaw
TH400 yolk=Super T10, and some special muncies