Joevette1970

How many LT-1 s came with 4.56 rear not counting the 25 ZR-1s ????

Vetteman Jack

Moved to C3 General.

avalonjohn

My roommate in college had a 70 LT-1. It was around 1989. The car was original. Yellow coupe black inside. He bought it from a well known vette guy. It had a an M22 and 4.11 gears. I thought the ZR-1 had 4.11 gears? Anyhow, the only thing that separated that car from a ZR-1 (according to the guy he bought it from) was the J56 brakes., which it did not have. I recall not being able to keep it on the ground in 4th gear. What a ride. And yes, it was all original, Wonder who has it.

Iceaxe

Zero... as 4.56 gears were not an option, at least according to Corvette DNA... they could be wrong.

Hammerhead Fred

Not counting the 25 ZR1's - None and None
All 25 ZR1's got the 25 M22 transmissions and no 4.56 gear was available.

Duntov

73C34me

I don’t know what it came in/ from, but I bought a loaded differential that had a 4.56:1 RP. It was stamped as GM parts.

Iceaxe

The 4.56:1 gears were available in the 68 and 69 Corvette, but I believe the gears were only available with the L88 option.

Duntov

GUSTO14

It appears the 4:56 gears were available in 1970 as well... page 91, https://www.gmheritagecenter.com/doc...t-Corvette.pdf


GUSTO

Duntov

Hammerhead Fred

toylman

GM also had the tune up specs on the early LT1 emission label. LS7 does not exist.

bobbarry

That is interesting; what was the "360hp" engine, and what's up with two different ratings for the LS-7?

toylman

360hp Z28. GM always gave the Corvette the "edge" even though the engine was basically the same.

bobbarry

Ah; I didn't think they used the same tune-up sticker on different model cars.

Thanks!

LT-1 kid

I think they did ( GM )

66L36Coupe

In 1970 4.56 posi was available, but only with the ZR1 special hi-performance engine package. I have 1970 ZR1 coupe and is one of 3 that I know of that came optioned with it in '70 (out of the 14 or 15 known cars in the registry). The ratio is documented by the interior build sheet listing the correct option code - BTW it's the only other variable option that was ordered on the car besides the ZR1 package and a tilt/tele wheel. It's a lot of fun to drive, especially with the lightweight flywheel and close ratio trans. Lots of throttle steer.

jr9170

How the 70 ZR-1 ? You should post that video here to let them hear that m-22

stingr69

Less efficient "Log" manifolds on a Z/28 vs more efficient "Rams Horn" manifolds on a Corvette. Seems like a decent excuse.