M-20 with L-78 or L-72 & deep gear -How?

[Don_Lightfoot]

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I know there are quite a few 69 Z28's out there with M20's in them with 3.73 gears like mine.

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The 69 RS/SS 350 I did up in the mid 1990's had the original drivetrain front to back and it was an M-20 with 4.10's.

I'm wondering if there were different circumstances between BB and SB

[Schonyenko2]

My 70 nova L78 had a M20 with a 3.55 rear Schonye

[Salvatore]

Most small blocks respond better with a lower first gear. (M20) Especially a Z/28. They have no torque. I have the original M21 in my Z. Fortunally it has 4:10's or it would have a hard time just pulling out. I have a fresh M20 ready for it, just to lazy to change it. BB's have more torque so the M21 is a little better in mid range I believe. I think you could probably get what you wanted back then.

[firstgenaddict]

I remember alot of older magazine articles stating that they got the best 1/4 mile ets by revving to about 4000 and starting in 2nd gear. It would cause the engine to fall from the peak torque range there by allowing the tires to hook up. Then the engine would come in to the fat part of the torque curve with the car already hooked and rolling so you wouldn't have to baby it off the line.

[berger]

tony(mrmotion) how is it checked off on your original canadian doc'd jan 68 L78 M22 4.88 factory, on the dealer order form you got from the original owner professor Mas----.

[MrMotion]

My 68 SSL78 has Canadian GM Documentation that shows the Close ratio M22 and the G80 positraction with 4.88 gears. The Sales Order is exactly the same. Up to 69 it looks like GM allowed an "open order" process. In 69 they seem to have restructured the order process to reflect manufacturing efficiency.

[Stefano]

I have a VanNuys Built 1969 Camaro L78 which has an M20 with 3.55 posi.

[camaromb]

I recently sold an unrestored '69 Z28 with original M20 trans and 4.10 rear. It had great pedal response at low speeds unlike any other Z I have owned.
There was also at least one Canadian Copo Camaro built with an M20 trans.
Mark

[Pantera]

My '69 L-78 7,400 mi survivor Nova has the build sheet showing a M-20 but the tranny does not have a ring around it?

It also has a 3:36 rear.

Could it have been replaced with new gears under warranty?

Trans Case has all the correct numbers on it.

[JRSully]

My original 69 L78 Nova has an M20 on the build sheet, and was ordered and still has the original 4:56 rear in it (gear change was necessary to say the least) SULLY