number of m-21 cars?

t-37 fred · Newbie

number of m-21 cars?

Captain Beaumont · Poncho Master!

Welcome from Edmonton smile

Elroy · Poncho Master!

welcome Fred ! Wow only 2 433 cars and you have one ?? Can you share your build sheet and some pics ?

87 player bird · Poncho Master!

Welcome. Pretty rare ride you have.

DrCAS · Guru

4:33? Holy moly....

Welcome from St Cloud, MN

Pontiacanada · A Poncho Legend!

Welcome Fred from PEI.

t-37 fred · Newbie

Thanx for the welcome.I will up load pix and build data ASAP.Fred

Beaumont4008 · Uber Guru

Welcome from winnipeg. Like they say love to see some pics. Sounds like your car was optioned for the drag strip. Cool.

-- Edited by Beaumont4008 on Wednesday 6th of April 2011 10:10:20 AM

69camarox11 · Addicted!

t-37 fred wrote:
I have a 1970 t-37 400 m-21 4:33 12 bolt car.GM list 45 hard top 400 cars and 2 4:33 cars. can any one tell me how many m-21 cars where built.Thanx

I believe you can find the 1971 GT-37 engine/transmission production number breakdown but not the 1970. There were 20,883 1970 T-37s produced and 44,896 1971 T-37s produced. There were only 572 1971 L78 400 4BBL GT-37s produced with M21 4 speed manual transmissions. So can we estimate there were 1/2 that number in 1970?

1971 T41 and GT37.jpg

Check with Scott Tieman at UltimateGTO.com.

-- Edited by 69camarox11 on Sunday 5th of June 2011 07:39:30 PM

-- Edited by 69camarox11 on Sunday 5th of June 2011 08:09:48 PM

69camarox11 · Addicted!

t-37 fred wrote:
I have a 1970 t-37 400 m-21 4:33 12 bolt car.GM list 45 hard top 400 cars and 2 4:33 cars. can any one tell me how many m-21 cars where built.Thanx

The following information is from book by John Gunnell, 1961-2004 Standard Catalog of G.T.O. - Tempest - LeMans - Can Am - Grand Am.

Page 92: Tempest GT-37---(V8)---Series 233 (Mid-Year Addition)

NOTE 1: Total 1970 production of Tempest, T-37 and GT-37 two-door hardtops combined was 9,187.

NOTE 2: Total 1970 production of Tempest and Tempest GT-37 two-door coupes combined was 11,977.

NOTE 3: 1,419 1970 GT-37s (hardtops and coupes) were built.

NOTE 4: 42,047 1970 Tempests of all types were built.

NOTE 5: 5,148 1970 Tempests, T-37s and GT-37s had synchromesh and 36,899 1970 Tempests, T-37s and GT-37s had automatic transmissions.

Page 99: Historical Footnotes

Calendar-year sales of new"Tempests" by registered Pontiac dealers came to 184,913 units for a 2.6 percent share of the domestic industry total. Model-year production was 213,239 units for a slightly better 2.8 percent share of domestic industry output.

Option Installation Rates:

Of 213,239 Tempests built 88.7 percent (189,143) had automatic transmission, 6.8 percent (14,500) had a four-speed synchromesh transmission and remaining 4.5 percent (9,596) had three-speed manual transmissions.

My conclusion: Was it 5,148 or 14,500 4-speeds installed?

To answer my own question above, the 5,148 4-speed Tempests were built from mid-year (January, 1970 to the end of model year production in August, 1970. The 14,500 4-speed Tempests were built during the entire 1970 model year production from July, 1969 until August, 1970.

-- Edited by 69camarox11 on Monday 6th of June 2011 04:17:59 PM

-- Edited by 69camarox11 on Tuesday 7th of June 2011 03:31:11 PM

CdnGMfan · Canadian Poncho Superstar!

In 1970 if you ordered a 400 with a manual trans (3 or 4-speed) in your Tempest, you actually got a Ram Air III engine! 4.33 gearing was limited to engines that could hold up to the sort of buzzing that 4.33s would result in. 1970 was also the last year for factory 4.33s, 1971 they offered 3.90 but they were rare, only optionally coming on L78 400 M21 cars. After that it was 3.55 at best (they are pretty liveable). Pontiac got away from the revving Ram Air 400s after 1970 and went with torquey 455 engines for top performance (do not exceed 5000 rpm with the large stroke 455).

T-37 Fred, your car sounds awesome!

t-37 fred · Newbie

Thanx for info!!I wiil be posting photo soon.Fred