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Anyone know what type of bell housing this is on my 1972 that a super t10 was swapped out with at some point? No markings that I can find. It has an 11" friction plate and a 168 tooth flywheel. The bell housing sits an inch or so lower than the oil pan and is the lowest point on the car.
Curious to know if I need a special bellhousing because of the t10 transmission or does it use the same as a muncie? Would like to get rid of this and get something more factory.
Curious to know if I need a special bellhousing because of the t10 transmission or does it use the same as a muncie? Would like to get rid of this and get something more factory.
A Super T-10 should bolt up to any 64-81 Corvette (or Chevrolet) bellhousing. What you need to determine is whether you have an 10 1/2" or 11" inch clutch and flywheel, and which starter you have.
The "621" (last three digits of the casting number) bellhousing is used with an 11" clutch and the 168 tooth flywheel. In 65-66 there was also a "444" bellhousing for the 11" clutch, that's identical to the 621, except for the casting number.
The other common bellhousing is the "403", which is used with the 10 1/2" clutch and the 153 tooth flywheel.
There are two bellhousing you can't use. One is the 1963 "421" bellhousing, and the other is the early Nova "383" bellhousing, While the 421 will work with the 10 1/2" clutch and the 153 tooth flywheel, it has a smaller center hole and will only work with 63 and earlier regular T-10's and 63 Muncies. The Nova 383 bellhousing places the clutch fork at eight o'clock, not at nine o'clock like on Corvettes and other Chevrolets.
A Super T-10 should bolt up to any 64-81 Corvette (or Chevrolet) bellhousing. What you need to determine is whether you have an 10 1/2" or 11" inch clutch and flywheel, and which starter you have.
The "621" (last three digits of the casting number) bellhousing is used with an 11" clutch and the 168 tooth flywheel. In 65-66 there was also a "444" bellhousing for the 11" clutch, that's identical to the 621, except for the casting number.
The other common bellhousing is the "403", which is used with the 10 1/2" clutch and the 153 tooth flywheel.
There are two bellhousing you can't use. One is the 1963 "421" bellhousing, and the other is the early Nova "383" bellhousing, While the 421 will work with the 10 1/2" clutch and the 153 tooth flywheel, it has a smaller center hole and will only work with 63 and earlier regular T-10's and 63 Muncies. The Nova 383 bellhousing places the clutch fork at eight o'clock, not at nine o'clock like on Corvettes and other Chevrolets.
You da man! That's what I needed to hear. Thanks gbvette!
you could cut an inch or so off the bottom and lose nothing but some of the used value of the bell housing. every other bell has an open bottom. not saying do it, but all options should always be considered.
Last edited by derekderek; May 19, 2022 at 11:08 AM.
I think I should have been more specific. The grooves or rings go around the input shaft. The number of rings will identify the 1st gear ratio of the tranny. There are many for a ST10.
A little hard to see in this pic, but there are grooves on these input shafts
Easier to see the grooves here on a 10 spline Muncie. None, one or two. No grooves is a M22, one groove a M21, and two grooves a M20
I think I should have been more specific. The grooves or rings go around the input shaft. The number of rings will identify the 1st gear ratio of the tranny. There are many for a ST10.
A little hard to see in this pic, but there are grooves on these input shafts
Easier to see the grooves here on a 10 spline Muncie. None, one or two. No grooves is a M22, one groove a M21, and two grooves a M20
No problem. 3 groove, from info I have, would be a 2.64 first gear. So essentially very close to the M20 wide ratio Muncie. Regardless, the BW ST10 is very good tranny. Ratios for 3 groove from 1st to 4th: 2.64; 1.75; 1.34; 1.00.
A 2.64 first is great off the line and stop light traffic, even with a low 3 numerically rear.
My LT1 has the M20 with the 2.52 first and 3.55 rear end and it comes out of the hole really well with a BETTER effective first gear than a M21 3.70 gear car and the 3.55 results in a lower overall RPM at highway speeds in 4th gear.
Effective first is calculated by multiplying the rear ratio times the trans ratio.
2.52 x 3.55 = 8.946
2.20 x 3.70 = 8.14
2.64 x 3.55 = 9.372
Unknown bell housing
