M21 vs T10

[Fast67VelleN2O]

[ QUOTE ]
Is this T10 a mutant, with the alum tail and the steel case?

Trans-man says T10 two inches longer at the case; ear to tail case end. The gears are out of the M21; could the length variable be the size of the rear spline ?



[/ QUOTE ]

I just measured a Muncie and a Super T10. There is a 1/2" difference in length from mounting flange to the rear seal. Your Super T10 is not a bastard. A lot of those transmissions came with iron case and aluminum tail shafts. I have owned bout 30 of them over the years.

-Matt

[x Baldwin Motion]

Thanks Matt, can I get away with my original driveshaft with the 1/2" difference?

[Blade4444]

According to the info i found, 6 grooves mean it has a 2.88 first gear, mine has 6 and i really hope is not a 3.42.
this is the ratios i found,
Number of ID Groves, 1st 2nd 3rd 4th
2, 2.43 1.61 1.23 1.00

3, 2.64 1.75 1.33 1.00

5, 3.42 2.28 1.46 1.00

6, 2.88 1.91 1.33 1.00

[Fast67VelleN2O]

Your number 5 and 6 are backwards Blade.

Chris- I think you could get away with your standard driveshaft.

[69L72RS]

Here is a good info site for the ST10

http://fiedlerh.home.att.net/BW.htm

[396L35]

Sorry I couldn't see the pictures on my work computer. It looks like a nice 904 steel case with a 342 1st gear. You can get away with 373's or 410's with a taller tire and still have some low end out of the box. These trannys are extremely strong with the steel case and mid plate and it would be the one I would use instead of the M21. Mark

[x Baldwin Motion]

Thanks everyone for all the help.



I will install the T10 in the Chevelle and save the M21 for the Nova conversion next winter.



Now, about that peg leg 3:08 10 bolt I have. What's the best unit for swapping the guts for a 3:73 posi ?

[crash]

You have a 3.42Z ST-10, with or without the 904 steel case this trans is rated at 285 ft/tq...
What makes these weak is the input gear has 17 teeth and the mating gear on the cluster has 31 teeth... M-21 has 26T input/27T cluster...
I buy these all the time with blown input and cluster gear to get the good main case...
Your final drive in first gear with the 4.10's would be 14.022, good for 20ft before you have to shift...
The early Muncie's are 21 1/4" long, the ST-10"s are 22" long, so you might need a drive shaft shortened...
You might want to rethink what your going to do...
E-mail me if you want to talk about it... Crash
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