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Was the M21 2.20.1 trans/3.70 rear ratio unique only to LT1 and LS5 or was this combo available on the base engine package.According to spec guide no.This may be wrong though,thanks in advance.
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Re: 71 options
In 1971, the standard, base engine (SB), provided buyers with a choice of 'economy' or 'standard' rear axle ratios with manual transmission. Economy was the 3.08 gear ratio and standard was a 3.36 ratio.
When the LT1 option was selected, the selection table expanded to three choices: standard, economy or performance with the individual gear ratios dictated by M20 vs. M21. For the wide ratio manual transmission (M20) the ratios were: 3.70, 3.55, or 4.11. With a close ration manual transmission (M21) the ratios were: 3.55, 3.36 or 3.70.
There were separate tables for the BB LS5 and LS6 engines. The 3.70 rear gear ratio wasn't a member of the table choices, but could be ordered outside the ratio table for both LS5 and LS6 engines with wide ratio manual transmissions. -
Re: 71 options
SO the way I understand this is my setup M21/3.70 rear cannot be part of A base engine package.I have an LT1 I'm trying to authenticate.Has the CGZ block with vin on motor and trans and frame.The body is fishy though.No ti ignition or holes for amp,The shifter has been cut out for an auto trans,but has welded crossmember body could have been changed is convert also,stumpedComment
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Re: 71 options
Remember convertible frames have an extra pair of body mounts under the door sill.
Is the stamp "real"? Does the VIN font match on engine and transmission?Dick WhittingtonComment
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Re: 71 options
This car has 8 body mounts,the font seems to be same on engine and trans,looked at block with mag glass,see no swirl marks,has original pits.Comment
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Re: 71 options
Dick are you sure C3 convertibles had an extra body mount under the door sill? This would place it between the one behind the kick panel/speaker panel and the body mount accessable by removing the plate at the front of the rear fenderwell.Comment
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Re: 71 options
Yes I think he is mistaken,I bought body mounts for this car it came with the standard 8 .Comment
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Re: 71 options
Dick,
They are saying your mind is failing.
Tell me it ain't so! Tell me we're not getting old!
VerleComment
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Re: 71 options
It's with all due respectComment
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Re: 71 options
Vincent,
I was picking on Dick, not castigating you.
VerleComment
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Re: 71 options
Verle I had a 71 LT-1 for 33 years 2nd owner the car was built in Sept 70 was equiped with a M21 with 4:11 rear all original and CGZ. PaulComment
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Re: 71 options
Oops! Semantics are at it again. The additional mount for a convertible is accessed thru the kick panel. Anywho, an extra pair of mounts vs a coupe.
Verle, it is a know fact that I suffer from a terrible case of NCRS (Never Can Remember Squat) disease. Was diagnosed many years ago, and with many more birthdays it don't git any betterDick WhittingtonComment
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Re: 71 options
Dickie, I think you're thinking the C3 Number 1 body mount is at the radiator support like the C2s(?).
I know you know this, but actually there is not a "front" body mount on C3s per se (at least through 72) like on earlier cars; the radiator support simply bolts to the front frame crossmember. The Number 1 body mount is just in front of the firewall, Number 2 is inside the kick panel, Number 3 is at the front of the rear wheelwell, and Number 4 is exposed at the rear of the rear wheelwell...only eight total, coupe or convertible.
You had me going for a bit...I'm thinking, "Dang! Really?!...I never knew that!" But, then after Jim raised the flag, I checked the AIM...but I didn't say anything; I know how it is to be old.Comment
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